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wp-api.js (46983B)

---

 /**
  * @output wp-includes/js/wp-api.js
  */
 
 (function( window, undefined ) {
 
 	'use strict';
 
 	/**
 	 * Initialise the WP_API.
 	 */
 	function WP_API() {
 		/** @namespace wp.api.models */
 		this.models = {};
 		/** @namespace wp.api.collections */
 		this.collections = {};
 		/** @namespace wp.api.views */
 		this.views = {};
 	}
 
 	/** @namespace wp */
 	window.wp            = window.wp || {};
 	/** @namespace wp.api */
 	wp.api               = wp.api || new WP_API();
 	wp.api.versionString = wp.api.versionString || 'wp/v2/';
 
 	// Alias _includes to _.contains, ensuring it is available if lodash is used.
 	if ( ! _.isFunction( _.includes ) && _.isFunction( _.contains ) ) {
 	  _.includes = _.contains;
 	}
 
 })( window );
 
 (function( window, undefined ) {
 
 	'use strict';
 
 	var pad, r;
 
 	/** @namespace wp */
 	window.wp = window.wp || {};
 	/** @namespace wp.api */
 	wp.api = wp.api || {};
 	/** @namespace wp.api.utils */
 	wp.api.utils = wp.api.utils || {};
 
 	/**
 	 * Determine model based on API route.
 	 *
 	 * @param {string} route    The API route.
 	 *
 	 * @return {Backbone Model} The model found at given route. Undefined if not found.
 	 */
 	wp.api.getModelByRoute = function( route ) {
 		return _.find( wp.api.models, function( model ) {
 			return model.prototype.route && route === model.prototype.route.index;
 		} );
 	};
 
 	/**
 	 * Determine collection based on API route.
 	 *
 	 * @param {string} route    The API route.
 	 *
 	 * @return {Backbone Model} The collection found at given route. Undefined if not found.
 	 */
 	wp.api.getCollectionByRoute = function( route ) {
 		return _.find( wp.api.collections, function( collection ) {
 			return collection.prototype.route && route === collection.prototype.route.index;
 		} );
 	};
 
 
 	/**
 	 * ECMAScript 5 shim, adapted from MDN.
 	 * @link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString
 	 */
 	if ( ! Date.prototype.toISOString ) {
 		pad = function( number ) {
 			r = String( number );
 			if ( 1 === r.length ) {
 				r = '0' + r;
 			}
 
 			return r;
 		};
 
 		Date.prototype.toISOString = function() {
 			return this.getUTCFullYear() +
 				'-' + pad( this.getUTCMonth() + 1 ) +
 				'-' + pad( this.getUTCDate() ) +
 				'T' + pad( this.getUTCHours() ) +
 				':' + pad( this.getUTCMinutes() ) +
 				':' + pad( this.getUTCSeconds() ) +
 				'.' + String( ( this.getUTCMilliseconds() / 1000 ).toFixed( 3 ) ).slice( 2, 5 ) +
 				'Z';
 		};
 	}
 
 	/**
 	 * Parse date into ISO8601 format.
 	 *
 	 * @param {Date} date.
 	 */
 	wp.api.utils.parseISO8601 = function( date ) {
 		var timestamp, struct, i, k,
 			minutesOffset = 0,
 			numericKeys = [ 1, 4, 5, 6, 7, 10, 11 ];
 
 		/*
 		 * ES5 §15.9.4.2 states that the string should attempt to be parsed as a Date Time String Format string
 		 * before falling back to any implementation-specific date parsing, so that’s what we do, even if native
 		 * implementations could be faster.
 		 */
 		//              1 YYYY                2 MM       3 DD           4 HH    5 mm       6 ss        7 msec        8 Z 9 ±    10 tzHH    11 tzmm
 		if ( ( struct = /^(\d{4}|[+\-]\d{6})(?:-(\d{2})(?:-(\d{2}))?)?(?:T(\d{2}):(\d{2})(?::(\d{2})(?:\.(\d{3}))?)?(?:(Z)|([+\-])(\d{2})(?::(\d{2}))?)?)?$/.exec( date ) ) ) {
 
 			// Avoid NaN timestamps caused by “undefined” values being passed to Date.UTC.
 			for ( i = 0; ( k = numericKeys[i] ); ++i ) {
 				struct[k] = +struct[k] || 0;
 			}
 
 			// Allow undefined days and months.
 			struct[2] = ( +struct[2] || 1 ) - 1;
 			struct[3] = +struct[3] || 1;
 
 			if ( 'Z' !== struct[8]  && undefined !== struct[9] ) {
 				minutesOffset = struct[10] * 60 + struct[11];
 
 				if ( '+' === struct[9] ) {
 					minutesOffset = 0 - minutesOffset;
 				}
 			}
 
 			timestamp = Date.UTC( struct[1], struct[2], struct[3], struct[4], struct[5] + minutesOffset, struct[6], struct[7] );
 		} else {
 			timestamp = Date.parse ? Date.parse( date ) : NaN;
 		}
 
 		return timestamp;
 	};
 
 	/**
 	 * Helper function for getting the root URL.
 	 * @return {[type]} [description]
 	 */
 	wp.api.utils.getRootUrl = function() {
 		return window.location.origin ?
 			window.location.origin + '/' :
 			window.location.protocol + '//' + window.location.host + '/';
 	};
 
 	/**
 	 * Helper for capitalizing strings.
 	 */
 	wp.api.utils.capitalize = function( str ) {
 		if ( _.isUndefined( str ) ) {
 			return str;
 		}
 		return str.charAt( 0 ).toUpperCase() + str.slice( 1 );
 	};
 
 	/**
 	 * Helper function that capitalizes the first word and camel cases any words starting
 	 * after dashes, removing the dashes.
 	 */
 	wp.api.utils.capitalizeAndCamelCaseDashes = function( str ) {
 		if ( _.isUndefined( str ) ) {
 			return str;
 		}
 		str = wp.api.utils.capitalize( str );
 
 		return wp.api.utils.camelCaseDashes( str );
 	};
 
 	/**
 	 * Helper function to camel case the letter after dashes, removing the dashes.
 	 */
 	wp.api.utils.camelCaseDashes = function( str ) {
 		return str.replace( /-([a-z])/g, function( g ) {
 			return g[ 1 ].toUpperCase();
 		} );
 	};
 
 	/**
 	 * Extract a route part based on negative index.
 	 *
 	 * @param {string}   route          The endpoint route.
 	 * @param {number}   part           The number of parts from the end of the route to retrieve. Default 1.
 	 *                                  Example route `/a/b/c`: part 1 is `c`, part 2 is `b`, part 3 is `a`.
 	 * @param {string}  [versionString] Version string, defaults to `wp.api.versionString`.
 	 * @param {boolean} [reverse]       Whether to reverse the order when extracting the route part. Optional, default false.
 	 */
 	wp.api.utils.extractRoutePart = function( route, part, versionString, reverse ) {
 		var routeParts;
 
 		part = part || 1;
 		versionString = versionString || wp.api.versionString;
 
 		// Remove versions string from route to avoid returning it.
 		if ( 0 === route.indexOf( '/' + versionString ) ) {
 			route = route.substr( versionString.length + 1 );
 		}
 
 		routeParts = route.split( '/' );
 		if ( reverse ) {
 			routeParts = routeParts.reverse();
 		}
 		if ( _.isUndefined( routeParts[ --part ] ) ) {
 			return '';
 		}
 		return routeParts[ part ];
 	};
 
 	/**
 	 * Extract a parent name from a passed route.
 	 *
 	 * @param {string} route The route to extract a name from.
 	 */
 	wp.api.utils.extractParentName = function( route ) {
 		var name,
 			lastSlash = route.lastIndexOf( '_id>[\\d]+)/' );
 
 		if ( lastSlash < 0 ) {
 			return '';
 		}
 		name = route.substr( 0, lastSlash - 1 );
 		name = name.split( '/' );
 		name.pop();
 		name = name.pop();
 		return name;
 	};
 
 	/**
 	 * Add args and options to a model prototype from a route's endpoints.
 	 *
 	 * @param {Array}  routeEndpoints Array of route endpoints.
 	 * @param {Object} modelInstance  An instance of the model (or collection)
 	 *                                to add the args to.
 	 */
 	wp.api.utils.decorateFromRoute = function( routeEndpoints, modelInstance ) {
 
 		/**
 		 * Build the args based on route endpoint data.
 		 */
 		_.each( routeEndpoints, function( routeEndpoint ) {
 
 			// Add post and edit endpoints as model args.
 			if ( _.includes( routeEndpoint.methods, 'POST' ) || _.includes( routeEndpoint.methods, 'PUT' ) ) {
 
 				// Add any non-empty args, merging them into the args object.
 				if ( ! _.isEmpty( routeEndpoint.args ) ) {
 
 					// Set as default if no args yet.
 					if ( _.isEmpty( modelInstance.prototype.args ) ) {
 						modelInstance.prototype.args = routeEndpoint.args;
 					} else {
 
 						// We already have args, merge these new args in.
 						modelInstance.prototype.args = _.extend( modelInstance.prototype.args, routeEndpoint.args );
 					}
 				}
 			} else {
 
 				// Add GET method as model options.
 				if ( _.includes( routeEndpoint.methods, 'GET' ) ) {
 
 					// Add any non-empty args, merging them into the defaults object.
 					if ( ! _.isEmpty( routeEndpoint.args ) ) {
 
 						// Set as default if no defaults yet.
 						if ( _.isEmpty( modelInstance.prototype.options ) ) {
 							modelInstance.prototype.options = routeEndpoint.args;
 						} else {
 
 							// We already have options, merge these new args in.
 							modelInstance.prototype.options = _.extend( modelInstance.prototype.options, routeEndpoint.args );
 						}
 					}
 
 				}
 			}
 
 		} );
 
 	};
 
 	/**
 	 * Add mixins and helpers to models depending on their defaults.
 	 *
 	 * @param {Backbone Model} model          The model to attach helpers and mixins to.
 	 * @param {string}         modelClassName The classname of the constructed model.
 	 * @param {Object} 	       loadingObjects An object containing the models and collections we are building.
 	 */
 	wp.api.utils.addMixinsAndHelpers = function( model, modelClassName, loadingObjects ) {
 
 		var hasDate = false,
 
 			/**
 			 * Array of parseable dates.
 			 *
 			 * @type {string[]}.
 			 */
 			parseableDates = [ 'date', 'modified', 'date_gmt', 'modified_gmt' ],
 
 			/**
 			 * Mixin for all content that is time stamped.
 			 *
 			 * This mixin converts between mysql timestamps and JavaScript Dates when syncing a model
 			 * to or from the server. For example, a date stored as `2015-12-27T21:22:24` on the server
 			 * gets expanded to `Sun Dec 27 2015 14:22:24 GMT-0700 (MST)` when the model is fetched.
 			 *
 			 * @type {{toJSON: toJSON, parse: parse}}.
 			 */
 			TimeStampedMixin = {
 
 				/**
 				 * Prepare a JavaScript Date for transmitting to the server.
 				 *
 				 * This helper function accepts a field and Date object. It converts the passed Date
 				 * to an ISO string and sets that on the model field.
 				 *
 				 * @param {Date}   date   A JavaScript date object. WordPress expects dates in UTC.
 				 * @param {string} field  The date field to set. One of 'date', 'date_gmt', 'date_modified'
 				 *                        or 'date_modified_gmt'. Optional, defaults to 'date'.
 				 */
 				setDate: function( date, field ) {
 					var theField = field || 'date';
 
 					// Don't alter non-parsable date fields.
 					if ( _.indexOf( parseableDates, theField ) < 0 ) {
 						return false;
 					}
 
 					this.set( theField, date.toISOString() );
 				},
 
 				/**
 				 * Get a JavaScript Date from the passed field.
 				 *
 				 * WordPress returns 'date' and 'date_modified' in the timezone of the server as well as
 				 * UTC dates as 'date_gmt' and 'date_modified_gmt'. Draft posts do not include UTC dates.
 				 *
 				 * @param {string} field  The date field to set. One of 'date', 'date_gmt', 'date_modified'
 				 *                        or 'date_modified_gmt'. Optional, defaults to 'date'.
 				 */
 				getDate: function( field ) {
 					var theField   = field || 'date',
 						theISODate = this.get( theField );
 
 					// Only get date fields and non-null values.
 					if ( _.indexOf( parseableDates, theField ) < 0 || _.isNull( theISODate ) ) {
 						return false;
 					}
 
 					return new Date( wp.api.utils.parseISO8601( theISODate ) );
 				}
 			},
 
 			/**
 			 * Build a helper function to retrieve related model.
 			 *
 			 * @param {string} parentModel      The parent model.
 			 * @param {number} modelId          The model ID if the object to request
 			 * @param {string} modelName        The model name to use when constructing the model.
 			 * @param {string} embedSourcePoint Where to check the embedded object for _embed data.
 			 * @param {string} embedCheckField  Which model field to check to see if the model has data.
 			 *
 			 * @return {Deferred.promise}        A promise which resolves to the constructed model.
 			 */
 			buildModelGetter = function( parentModel, modelId, modelName, embedSourcePoint, embedCheckField ) {
 				var getModel, embeddedObjects, attributes, deferred;
 
 				deferred        = jQuery.Deferred();
 				embeddedObjects = parentModel.get( '_embedded' ) || {};
 
 				// Verify that we have a valid object id.
 				if ( ! _.isNumber( modelId ) || 0 === modelId ) {
 					deferred.reject();
 					return deferred;
 				}
 
 				// If we have embedded object data, use that when constructing the getModel.
 				if ( embeddedObjects[ embedSourcePoint ] ) {
 					attributes = _.findWhere( embeddedObjects[ embedSourcePoint ], { id: modelId } );
 				}
 
 				// Otherwise use the modelId.
 				if ( ! attributes ) {
 					attributes = { id: modelId };
 				}
 
 				// Create the new getModel model.
 				getModel = new wp.api.models[ modelName ]( attributes );
 
 				if ( ! getModel.get( embedCheckField ) ) {
 					getModel.fetch( {
 						success: function( getModel ) {
 							deferred.resolve( getModel );
 						},
 						error: function( getModel, response ) {
 							deferred.reject( response );
 						}
 					} );
 				} else {
 					// Resolve with the embedded model.
 					deferred.resolve( getModel );
 				}
 
 				// Return a promise.
 				return deferred.promise();
 			},
 
 			/**
 			 * Build a helper to retrieve a collection.
 			 *
 			 * @param {string} parentModel      The parent model.
 			 * @param {string} collectionName   The name to use when constructing the collection.
 			 * @param {string} embedSourcePoint Where to check the embedded object for _embed data.
 			 * @param {string} embedIndex       An additional optional index for the _embed data.
 			 *
 			 * @return {Deferred.promise} A promise which resolves to the constructed collection.
 			 */
 			buildCollectionGetter = function( parentModel, collectionName, embedSourcePoint, embedIndex ) {
 				/**
 				 * Returns a promise that resolves to the requested collection
 				 *
 				 * Uses the embedded data if available, otherwise fetches the
 				 * data from the server.
 				 *
 				 * @return {Deferred.promise} promise Resolves to a wp.api.collections[ collectionName ]
 				 * collection.
 				 */
 				var postId, embeddedObjects, getObjects,
 					classProperties = '',
 					properties      = '',
 					deferred        = jQuery.Deferred();
 
 				postId          = parentModel.get( 'id' );
 				embeddedObjects = parentModel.get( '_embedded' ) || {};
 
 				// Verify that we have a valid post ID.
 				if ( ! _.isNumber( postId ) || 0 === postId ) {
 					deferred.reject();
 					return deferred;
 				}
 
 				// If we have embedded getObjects data, use that when constructing the getObjects.
 				if ( ! _.isUndefined( embedSourcePoint ) && ! _.isUndefined( embeddedObjects[ embedSourcePoint ] ) ) {
 
 					// Some embeds also include an index offset, check for that.
 					if ( _.isUndefined( embedIndex ) ) {
 
 						// Use the embed source point directly.
 						properties = embeddedObjects[ embedSourcePoint ];
 					} else {
 
 						// Add the index to the embed source point.
 						properties = embeddedObjects[ embedSourcePoint ][ embedIndex ];
 					}
 				} else {
 
 					// Otherwise use the postId.
 					classProperties = { parent: postId };
 				}
 
 				// Create the new getObjects collection.
 				getObjects = new wp.api.collections[ collectionName ]( properties, classProperties );
 
 				// If we didn’t have embedded getObjects, fetch the getObjects data.
 				if ( _.isUndefined( getObjects.models[0] ) ) {
 					getObjects.fetch( {
 						success: function( getObjects ) {
 
 							// Add a helper 'parent_post' attribute onto the model.
 							setHelperParentPost( getObjects, postId );
 							deferred.resolve( getObjects );
 						},
 						error: function( getModel, response ) {
 							deferred.reject( response );
 						}
 					} );
 				} else {
 
 					// Add a helper 'parent_post' attribute onto the model.
 					setHelperParentPost( getObjects, postId );
 					deferred.resolve( getObjects );
 				}
 
 				// Return a promise.
 				return deferred.promise();
 
 			},
 
 			/**
 			 * Set the model post parent.
 			 */
 			setHelperParentPost = function( collection, postId ) {
 
 				// Attach post_parent id to the collection.
 				_.each( collection.models, function( model ) {
 					model.set( 'parent_post', postId );
 				} );
 			},
 
 			/**
 			 * Add a helper function to handle post Meta.
 			 */
 			MetaMixin = {
 
 				/**
 				 * Get meta by key for a post.
 				 *
 				 * @param {string} key The meta key.
 				 *
 				 * @return {Object} The post meta value.
 				 */
 				getMeta: function( key ) {
 					var metas = this.get( 'meta' );
 					return metas[ key ];
 				},
 
 				/**
 				 * Get all meta key/values for a post.
 				 *
 				 * @return {Object} The post metas, as a key value pair object.
 				 */
 				getMetas: function() {
 					return this.get( 'meta' );
 				},
 
 				/**
 				 * Set a group of meta key/values for a post.
 				 *
 				 * @param {Object} meta The post meta to set, as key/value pairs.
 				 */
 				setMetas: function( meta ) {
 					var metas = this.get( 'meta' );
 					_.extend( metas, meta );
 					this.set( 'meta', metas );
 				},
 
 				/**
 				 * Set a single meta value for a post, by key.
 				 *
 				 * @param {string} key   The meta key.
 				 * @param {Object} value The meta value.
 				 */
 				setMeta: function( key, value ) {
 					var metas = this.get( 'meta' );
 					metas[ key ] = value;
 					this.set( 'meta', metas );
 				}
 			},
 
 			/**
 			 * Add a helper function to handle post Revisions.
 			 */
 			RevisionsMixin = {
 				getRevisions: function() {
 					return buildCollectionGetter( this, 'PostRevisions' );
 				}
 			},
 
 			/**
 			 * Add a helper function to handle post Tags.
 			 */
 			TagsMixin = {
 
 				/**
 				 * Get the tags for a post.
 				 *
 				 * @return {Deferred.promise} promise Resolves to an array of tags.
 				 */
 				getTags: function() {
 					var tagIds = this.get( 'tags' ),
 						tags  = new wp.api.collections.Tags();
 
 					// Resolve with an empty array if no tags.
 					if ( _.isEmpty( tagIds ) ) {
 						return jQuery.Deferred().resolve( [] );
 					}
 
 					return tags.fetch( { data: { include: tagIds } } );
 				},
 
 				/**
 				 * Set the tags for a post.
 				 *
 				 * Accepts an array of tag slugs, or a Tags collection.
 				 *
 				 * @param {Array|Backbone.Collection} tags The tags to set on the post.
 				 *
 				 */
 				setTags: function( tags ) {
 					var allTags, newTag,
 						self = this,
 						newTags = [];
 
 					if ( _.isString( tags ) ) {
 						return false;
 					}
 
 					// If this is an array of slugs, build a collection.
 					if ( _.isArray( tags ) ) {
 
 						// Get all the tags.
 						allTags = new wp.api.collections.Tags();
 						allTags.fetch( {
 							data:    { per_page: 100 },
 							success: function( alltags ) {
 
 								// Find the passed tags and set them up.
 								_.each( tags, function( tag ) {
 									newTag = new wp.api.models.Tag( alltags.findWhere( { slug: tag } ) );
 
 									// Tie the new tag to the post.
 									newTag.set( 'parent_post', self.get( 'id' ) );
 
 									// Add the new tag to the collection.
 									newTags.push( newTag );
 								} );
 								tags = new wp.api.collections.Tags( newTags );
 								self.setTagsWithCollection( tags );
 							}
 						} );
 
 					} else {
 						this.setTagsWithCollection( tags );
 					}
 				},
 
 				/**
 				 * Set the tags for a post.
 				 *
 				 * Accepts a Tags collection.
 				 *
 				 * @param {Array|Backbone.Collection} tags The tags to set on the post.
 				 *
 				 */
 				setTagsWithCollection: function( tags ) {
 
 					// Pluck out the category IDs.
 					this.set( 'tags', tags.pluck( 'id' ) );
 					return this.save();
 				}
 			},
 
 			/**
 			 * Add a helper function to handle post Categories.
 			 */
 			CategoriesMixin = {
 
 				/**
 				 * Get a the categories for a post.
 				 *
 				 * @return {Deferred.promise} promise Resolves to an array of categories.
 				 */
 				getCategories: function() {
 					var categoryIds = this.get( 'categories' ),
 						categories  = new wp.api.collections.Categories();
 
 					// Resolve with an empty array if no categories.
 					if ( _.isEmpty( categoryIds ) ) {
 						return jQuery.Deferred().resolve( [] );
 					}
 
 					return categories.fetch( { data: { include: categoryIds } } );
 				},
 
 				/**
 				 * Set the categories for a post.
 				 *
 				 * Accepts an array of category slugs, or a Categories collection.
 				 *
 				 * @param {Array|Backbone.Collection} categories The categories to set on the post.
 				 *
 				 */
 				setCategories: function( categories ) {
 					var allCategories, newCategory,
 						self = this,
 						newCategories = [];
 
 					if ( _.isString( categories ) ) {
 						return false;
 					}
 
 					// If this is an array of slugs, build a collection.
 					if ( _.isArray( categories ) ) {
 
 						// Get all the categories.
 						allCategories = new wp.api.collections.Categories();
 						allCategories.fetch( {
 							data:    { per_page: 100 },
 							success: function( allcats ) {
 
 								// Find the passed categories and set them up.
 								_.each( categories, function( category ) {
 									newCategory = new wp.api.models.Category( allcats.findWhere( { slug: category } ) );
 
 									// Tie the new category to the post.
 									newCategory.set( 'parent_post', self.get( 'id' ) );
 
 									// Add the new category to the collection.
 									newCategories.push( newCategory );
 								} );
 								categories = new wp.api.collections.Categories( newCategories );
 								self.setCategoriesWithCollection( categories );
 							}
 						} );
 
 					} else {
 						this.setCategoriesWithCollection( categories );
 					}
 
 				},
 
 				/**
 				 * Set the categories for a post.
 				 *
 				 * Accepts Categories collection.
 				 *
 				 * @param {Array|Backbone.Collection} categories The categories to set on the post.
 				 *
 				 */
 				setCategoriesWithCollection: function( categories ) {
 
 					// Pluck out the category IDs.
 					this.set( 'categories', categories.pluck( 'id' ) );
 					return this.save();
 				}
 			},
 
 			/**
 			 * Add a helper function to retrieve the author user model.
 			 */
 			AuthorMixin = {
 				getAuthorUser: function() {
 					return buildModelGetter( this, this.get( 'author' ), 'User', 'author', 'name' );
 				}
 			},
 
 			/**
 			 * Add a helper function to retrieve the featured media.
 			 */
 			FeaturedMediaMixin = {
 				getFeaturedMedia: function() {
 					return buildModelGetter( this, this.get( 'featured_media' ), 'Media', 'wp:featuredmedia', 'source_url' );
 				}
 			};
 
 		// Exit if we don't have valid model defaults.
 		if ( _.isUndefined( model.prototype.args ) ) {
 			return model;
 		}
 
 		// Go thru the parsable date fields, if our model contains any of them it gets the TimeStampedMixin.
 		_.each( parseableDates, function( theDateKey ) {
 			if ( ! _.isUndefined( model.prototype.args[ theDateKey ] ) ) {
 				hasDate = true;
 			}
 		} );
 
 		// Add the TimeStampedMixin for models that contain a date field.
 		if ( hasDate ) {
 			model = model.extend( TimeStampedMixin );
 		}
 
 		// Add the AuthorMixin for models that contain an author.
 		if ( ! _.isUndefined( model.prototype.args.author ) ) {
 			model = model.extend( AuthorMixin );
 		}
 
 		// Add the FeaturedMediaMixin for models that contain a featured_media.
 		if ( ! _.isUndefined( model.prototype.args.featured_media ) ) {
 			model = model.extend( FeaturedMediaMixin );
 		}
 
 		// Add the CategoriesMixin for models that support categories collections.
 		if ( ! _.isUndefined( model.prototype.args.categories ) ) {
 			model = model.extend( CategoriesMixin );
 		}
 
 		// Add the MetaMixin for models that support meta.
 		if ( ! _.isUndefined( model.prototype.args.meta ) ) {
 			model = model.extend( MetaMixin );
 		}
 
 		// Add the TagsMixin for models that support tags collections.
 		if ( ! _.isUndefined( model.prototype.args.tags ) ) {
 			model = model.extend( TagsMixin );
 		}
 
 		// Add the RevisionsMixin for models that support revisions collections.
 		if ( ! _.isUndefined( loadingObjects.collections[ modelClassName + 'Revisions' ] ) ) {
 			model = model.extend( RevisionsMixin );
 		}
 
 		return model;
 	};
 
 })( window );
 
 /* global wpApiSettings:false */
 
 // Suppress warning about parse function's unused "options" argument:
 /* jshint unused:false */
 (function() {
 
 	'use strict';
 
 	var wpApiSettings = window.wpApiSettings || {},
 	trashableTypes    = [ 'Comment', 'Media', 'Comment', 'Post', 'Page', 'Status', 'Taxonomy', 'Type' ];
 
 	/**
 	 * Backbone base model for all models.
 	 */
 	wp.api.WPApiBaseModel = Backbone.Model.extend(
 		/** @lends WPApiBaseModel.prototype  */
 		{
 
 			// Initialize the model.
 			initialize: function() {
 
 				/**
 				* Types that don't support trashing require passing ?force=true to delete.
 				*
 				*/
 				if ( -1 === _.indexOf( trashableTypes, this.name ) ) {
 					this.requireForceForDelete = true;
 				}
 			},
 
 			/**
 			 * Set nonce header before every Backbone sync.
 			 *
 			 * @param {string} method.
 			 * @param {Backbone.Model} model.
 			 * @param {{beforeSend}, *} options.
 			 * @return {*}.
 			 */
 			sync: function( method, model, options ) {
 				var beforeSend;
 
 				options = options || {};
 
 				// Remove date_gmt if null.
 				if ( _.isNull( model.get( 'date_gmt' ) ) ) {
 					model.unset( 'date_gmt' );
 				}
 
 				// Remove slug if empty.
 				if ( _.isEmpty( model.get( 'slug' ) ) ) {
 					model.unset( 'slug' );
 				}
 
 				if ( _.isFunction( model.nonce ) && ! _.isEmpty( model.nonce() ) ) {
 					beforeSend = options.beforeSend;
 
 					// @todo Enable option for jsonp endpoints.
 					// options.dataType = 'jsonp';
 
 					// Include the nonce with requests.
 					options.beforeSend = function( xhr ) {
 						xhr.setRequestHeader( 'X-WP-Nonce', model.nonce() );
 
 						if ( beforeSend ) {
 							return beforeSend.apply( this, arguments );
 						}
 					};
 
 					// Update the nonce when a new nonce is returned with the response.
 					options.complete = function( xhr ) {
 						var returnedNonce = xhr.getResponseHeader( 'X-WP-Nonce' );
 
 						if ( returnedNonce && _.isFunction( model.nonce ) && model.nonce() !== returnedNonce ) {
 							model.endpointModel.set( 'nonce', returnedNonce );
 						}
 					};
 				}
 
 				// Add '?force=true' to use delete method when required.
 				if ( this.requireForceForDelete && 'delete' === method ) {
 					model.url = model.url() + '?force=true';
 				}
 				return Backbone.sync( method, model, options );
 			},
 
 			/**
 			 * Save is only allowed when the PUT OR POST methods are available for the endpoint.
 			 */
 			save: function( attrs, options ) {
 
 				// Do we have the put method, then execute the save.
 				if ( _.includes( this.methods, 'PUT' ) || _.includes( this.methods, 'POST' ) ) {
 
 					// Proxy the call to the original save function.
 					return Backbone.Model.prototype.save.call( this, attrs, options );
 				} else {
 
 					// Otherwise bail, disallowing action.
 					return false;
 				}
 			},
 
 			/**
 			 * Delete is only allowed when the DELETE method is available for the endpoint.
 			 */
 			destroy: function( options ) {
 
 				// Do we have the DELETE method, then execute the destroy.
 				if ( _.includes( this.methods, 'DELETE' ) ) {
 
 					// Proxy the call to the original save function.
 					return Backbone.Model.prototype.destroy.call( this, options );
 				} else {
 
 					// Otherwise bail, disallowing action.
 					return false;
 				}
 			}
 
 		}
 	);
 
 	/**
 	 * API Schema model. Contains meta information about the API.
 	 */
 	wp.api.models.Schema = wp.api.WPApiBaseModel.extend(
 		/** @lends Schema.prototype  */
 		{
 			defaults: {
 				_links: {},
 				namespace: null,
 				routes: {}
 			},
 
 			initialize: function( attributes, options ) {
 				var model = this;
 				options = options || {};
 
 				wp.api.WPApiBaseModel.prototype.initialize.call( model, attributes, options );
 
 				model.apiRoot = options.apiRoot || wpApiSettings.root;
 				model.versionString = options.versionString || wpApiSettings.versionString;
 			},
 
 			url: function() {
 				return this.apiRoot + this.versionString;
 			}
 		}
 	);
 })();
 
 ( function() {
 
 	'use strict';
 
 	var wpApiSettings = window.wpApiSettings || {};
 
 	/**
 	 * Contains basic collection functionality such as pagination.
 	 */
 	wp.api.WPApiBaseCollection = Backbone.Collection.extend(
 		/** @lends BaseCollection.prototype  */
 		{
 
 			/**
 			 * Setup default state.
 			 */
 			initialize: function( models, options ) {
 				this.state = {
 					data: {},
 					currentPage: null,
 					totalPages: null,
 					totalObjects: null
 				};
 				if ( _.isUndefined( options ) ) {
 					this.parent = '';
 				} else {
 					this.parent = options.parent;
 				}
 			},
 
 			/**
 			 * Extend Backbone.Collection.sync to add nince and pagination support.
 			 *
 			 * Set nonce header before every Backbone sync.
 			 *
 			 * @param {string} method.
 			 * @param {Backbone.Model} model.
 			 * @param {{success}, *} options.
 			 * @return {*}.
 			 */
 			sync: function( method, model, options ) {
 				var beforeSend, success,
 					self = this;
 
 				options = options || {};
 
 				if ( _.isFunction( model.nonce ) && ! _.isEmpty( model.nonce() ) ) {
 					beforeSend = options.beforeSend;
 
 					// Include the nonce with requests.
 					options.beforeSend = function( xhr ) {
 						xhr.setRequestHeader( 'X-WP-Nonce', model.nonce() );
 
 						if ( beforeSend ) {
 							return beforeSend.apply( self, arguments );
 						}
 					};
 
 					// Update the nonce when a new nonce is returned with the response.
 					options.complete = function( xhr ) {
 						var returnedNonce = xhr.getResponseHeader( 'X-WP-Nonce' );
 
 						if ( returnedNonce && _.isFunction( model.nonce ) && model.nonce() !== returnedNonce ) {
 							model.endpointModel.set( 'nonce', returnedNonce );
 						}
 					};
 				}
 
 				// When reading, add pagination data.
 				if ( 'read' === method ) {
 					if ( options.data ) {
 						self.state.data = _.clone( options.data );
 
 						delete self.state.data.page;
 					} else {
 						self.state.data = options.data = {};
 					}
 
 					if ( 'undefined' === typeof options.data.page ) {
 						self.state.currentPage  = null;
 						self.state.totalPages   = null;
 						self.state.totalObjects = null;
 					} else {
 						self.state.currentPage = options.data.page - 1;
 					}
 
 					success = options.success;
 					options.success = function( data, textStatus, request ) {
 						if ( ! _.isUndefined( request ) ) {
 							self.state.totalPages   = parseInt( request.getResponseHeader( 'x-wp-totalpages' ), 10 );
 							self.state.totalObjects = parseInt( request.getResponseHeader( 'x-wp-total' ), 10 );
 						}
 
 						if ( null === self.state.currentPage ) {
 							self.state.currentPage = 1;
 						} else {
 							self.state.currentPage++;
 						}
 
 						if ( success ) {
 							return success.apply( this, arguments );
 						}
 					};
 				}
 
 				// Continue by calling Backbone's sync.
 				return Backbone.sync( method, model, options );
 			},
 
 			/**
 			 * Fetches the next page of objects if a new page exists.
 			 *
 			 * @param {data: {page}} options.
 			 * @return {*}.
 			 */
 			more: function( options ) {
 				options = options || {};
 				options.data = options.data || {};
 
 				_.extend( options.data, this.state.data );
 
 				if ( 'undefined' === typeof options.data.page ) {
 					if ( ! this.hasMore() ) {
 						return false;
 					}
 
 					if ( null === this.state.currentPage || this.state.currentPage <= 1 ) {
 						options.data.page = 2;
 					} else {
 						options.data.page = this.state.currentPage + 1;
 					}
 				}
 
 				return this.fetch( options );
 			},
 
 			/**
 			 * Returns true if there are more pages of objects available.
 			 *
 			 * @return {null|boolean}
 			 */
 			hasMore: function() {
 				if ( null === this.state.totalPages ||
 					 null === this.state.totalObjects ||
 					 null === this.state.currentPage ) {
 					return null;
 				} else {
 					return ( this.state.currentPage < this.state.totalPages );
 				}
 			}
 		}
 	);
 
 } )();
 
 ( function() {
 
 	'use strict';
 
 	var Endpoint, initializedDeferreds = {},
 		wpApiSettings = window.wpApiSettings || {};
 
 	/** @namespace wp */
 	window.wp = window.wp || {};
 
 	/** @namespace wp.api */
 	wp.api    = wp.api || {};
 
 	// If wpApiSettings is unavailable, try the default.
 	if ( _.isEmpty( wpApiSettings ) ) {
 		wpApiSettings.root = window.location.origin + '/wp-json/';
 	}
 
 	Endpoint = Backbone.Model.extend(/** @lends Endpoint.prototype */{
 		defaults: {
 			apiRoot: wpApiSettings.root,
 			versionString: wp.api.versionString,
 			nonce: null,
 			schema: null,
 			models: {},
 			collections: {}
 		},
 
 		/**
 		 * Initialize the Endpoint model.
 		 */
 		initialize: function() {
 			var model = this, deferred;
 
 			Backbone.Model.prototype.initialize.apply( model, arguments );
 
 			deferred = jQuery.Deferred();
 			model.schemaConstructed = deferred.promise();
 
 			model.schemaModel = new wp.api.models.Schema( null, {
 				apiRoot:       model.get( 'apiRoot' ),
 				versionString: model.get( 'versionString' ),
 				nonce:         model.get( 'nonce' )
 			} );
 
 			// When the model loads, resolve the promise.
 			model.schemaModel.once( 'change', function() {
 				model.constructFromSchema();
 				deferred.resolve( model );
 			} );
 
 			if ( model.get( 'schema' ) ) {
 
 				// Use schema supplied as model attribute.
 				model.schemaModel.set( model.schemaModel.parse( model.get( 'schema' ) ) );
 			} else if (
 				! _.isUndefined( sessionStorage ) &&
 				( _.isUndefined( wpApiSettings.cacheSchema ) || wpApiSettings.cacheSchema ) &&
 				sessionStorage.getItem( 'wp-api-schema-model' + model.get( 'apiRoot' ) + model.get( 'versionString' ) )
 			) {
 
 				// Used a cached copy of the schema model if available.
 				model.schemaModel.set( model.schemaModel.parse( JSON.parse( sessionStorage.getItem( 'wp-api-schema-model' + model.get( 'apiRoot' ) + model.get( 'versionString' ) ) ) ) );
 			} else {
 				model.schemaModel.fetch( {
 					/**
 					 * When the server returns the schema model data, store the data in a sessionCache so we don't
 					 * have to retrieve it again for this session. Then, construct the models and collections based
 					 * on the schema model data.
 					 *
 					 * @ignore
 					 */
 					success: function( newSchemaModel ) {
 
 						// Store a copy of the schema model in the session cache if available.
 						if ( ! _.isUndefined( sessionStorage ) && ( _.isUndefined( wpApiSettings.cacheSchema ) || wpApiSettings.cacheSchema ) ) {
 							try {
 								sessionStorage.setItem( 'wp-api-schema-model' + model.get( 'apiRoot' ) + model.get( 'versionString' ), JSON.stringify( newSchemaModel ) );
 							} catch ( error ) {
 
 								// Fail silently, fixes errors in safari private mode.
 							}
 						}
 					},
 
 					// Log the error condition.
 					error: function( err ) {
 						window.console.log( err );
 					}
 				} );
 			}
 		},
 
 		constructFromSchema: function() {
 			var routeModel = this, modelRoutes, collectionRoutes, schemaRoot, loadingObjects,
 
 			/**
 			 * Set up the model and collection name mapping options. As the schema is built, the
 			 * model and collection names will be adjusted if they are found in the mapping object.
 			 *
 			 * Localizing a variable wpApiSettings.mapping will over-ride the default mapping options.
 			 *
 			 */
 			mapping = wpApiSettings.mapping || {
 				models: {
 					'Categories':      'Category',
 					'Comments':        'Comment',
 					'Pages':           'Page',
 					'PagesMeta':       'PageMeta',
 					'PagesRevisions':  'PageRevision',
 					'Posts':           'Post',
 					'PostsCategories': 'PostCategory',
 					'PostsRevisions':  'PostRevision',
 					'PostsTags':       'PostTag',
 					'Schema':          'Schema',
 					'Statuses':        'Status',
 					'Tags':            'Tag',
 					'Taxonomies':      'Taxonomy',
 					'Types':           'Type',
 					'Users':           'User'
 				},
 				collections: {
 					'PagesMeta':       'PageMeta',
 					'PagesRevisions':  'PageRevisions',
 					'PostsCategories': 'PostCategories',
 					'PostsMeta':       'PostMeta',
 					'PostsRevisions':  'PostRevisions',
 					'PostsTags':       'PostTags'
 				}
 			},
 
 			modelEndpoints = routeModel.get( 'modelEndpoints' ),
 			modelRegex     = new RegExp( '(?:.*[+)]|\/(' + modelEndpoints.join( '|' ) + '))$' );
 
 			/**
 			 * Iterate thru the routes, picking up models and collections to build. Builds two arrays,
 			 * one for models and one for collections.
 			 */
 			modelRoutes      = [];
 			collectionRoutes = [];
 			schemaRoot       = routeModel.get( 'apiRoot' ).replace( wp.api.utils.getRootUrl(), '' );
 			loadingObjects   = {};
 
 			/**
 			 * Tracking objects for models and collections.
 			 */
 			loadingObjects.models      = {};
 			loadingObjects.collections = {};
 
 			_.each( routeModel.schemaModel.get( 'routes' ), function( route, index ) {
 
 				// Skip the schema root if included in the schema.
 				if ( index !== routeModel.get( ' versionString' ) &&
 						index !== schemaRoot &&
 						index !== ( '/' + routeModel.get( 'versionString' ).slice( 0, -1 ) )
 				) {
 
 					// Single items end with a regex, or a special case word.
 					if ( modelRegex.test( index ) ) {
 						modelRoutes.push( { index: index, route: route } );
 					} else {
 
 						// Collections end in a name.
 						collectionRoutes.push( { index: index, route: route } );
 					}
 				}
 			} );
 
 			/**
 			 * Construct the models.
 			 *
 			 * Base the class name on the route endpoint.
 			 */
 			_.each( modelRoutes, function( modelRoute ) {
 
 				// Extract the name and any parent from the route.
 				var modelClassName,
 					routeName  = wp.api.utils.extractRoutePart( modelRoute.index, 2, routeModel.get( 'versionString' ), true ),
 					parentName = wp.api.utils.extractRoutePart( modelRoute.index, 1, routeModel.get( 'versionString' ), false ),
 					routeEnd   = wp.api.utils.extractRoutePart( modelRoute.index, 1, routeModel.get( 'versionString' ), true );
 
 				// Clear the parent part of the rouite if its actually the version string.
 				if ( parentName === routeModel.get( 'versionString' ) ) {
 					parentName = '';
 				}
 
 				// Handle the special case of the 'me' route.
 				if ( 'me' === routeEnd ) {
 					routeName = 'me';
 				}
 
 				// If the model has a parent in its route, add that to its class name.
 				if ( '' !== parentName && parentName !== routeName ) {
 					modelClassName = wp.api.utils.capitalizeAndCamelCaseDashes( parentName ) + wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
 					modelClassName = mapping.models[ modelClassName ] || modelClassName;
 					loadingObjects.models[ modelClassName ] = wp.api.WPApiBaseModel.extend( {
 
 						// Return a constructed url based on the parent and id.
 						url: function() {
 							var url =
 								routeModel.get( 'apiRoot' ) +
 								routeModel.get( 'versionString' ) +
 								parentName +  '/' +
 									( ( _.isUndefined( this.get( 'parent' ) ) || 0 === this.get( 'parent' ) ) ?
 										( _.isUndefined( this.get( 'parent_post' ) ) ? '' : this.get( 'parent_post' ) + '/' ) :
 										this.get( 'parent' ) + '/' ) +
 								routeName;
 
 							if ( ! _.isUndefined( this.get( 'id' ) ) ) {
 								url +=  '/' + this.get( 'id' );
 							}
 							return url;
 						},
 
 						// Track nonces on the Endpoint 'routeModel'.
 						nonce: function() {
 							return routeModel.get( 'nonce' );
 						},
 
 						endpointModel: routeModel,
 
 						// Include a reference to the original route object.
 						route: modelRoute,
 
 						// Include a reference to the original class name.
 						name: modelClassName,
 
 						// Include the array of route methods for easy reference.
 						methods: modelRoute.route.methods,
 
 						// Include the array of route endpoints for easy reference.
 						endpoints: modelRoute.route.endpoints
 					} );
 				} else {
 
 					// This is a model without a parent in its route.
 					modelClassName = wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
 					modelClassName = mapping.models[ modelClassName ] || modelClassName;
 					loadingObjects.models[ modelClassName ] = wp.api.WPApiBaseModel.extend( {
 
 						// Function that returns a constructed url based on the ID.
 						url: function() {
 							var url = routeModel.get( 'apiRoot' ) +
 								routeModel.get( 'versionString' ) +
 								( ( 'me' === routeName ) ? 'users/me' : routeName );
 
 							if ( ! _.isUndefined( this.get( 'id' ) ) ) {
 								url +=  '/' + this.get( 'id' );
 							}
 							return url;
 						},
 
 						// Track nonces at the Endpoint level.
 						nonce: function() {
 							return routeModel.get( 'nonce' );
 						},
 
 						endpointModel: routeModel,
 
 						// Include a reference to the original route object.
 						route: modelRoute,
 
 						// Include a reference to the original class name.
 						name: modelClassName,
 
 						// Include the array of route methods for easy reference.
 						methods: modelRoute.route.methods,
 
 						// Include the array of route endpoints for easy reference.
 						endpoints: modelRoute.route.endpoints
 					} );
 				}
 
 				// Add defaults to the new model, pulled form the endpoint.
 				wp.api.utils.decorateFromRoute(
 					modelRoute.route.endpoints,
 					loadingObjects.models[ modelClassName ],
 					routeModel.get( 'versionString' )
 				);
 
 			} );
 
 			/**
 			 * Construct the collections.
 			 *
 			 * Base the class name on the route endpoint.
 			 */
 			_.each( collectionRoutes, function( collectionRoute ) {
 
 				// Extract the name and any parent from the route.
 				var collectionClassName, modelClassName,
 						routeName  = collectionRoute.index.slice( collectionRoute.index.lastIndexOf( '/' ) + 1 ),
 						parentName = wp.api.utils.extractRoutePart( collectionRoute.index, 1, routeModel.get( 'versionString' ), false );
 
 				// If the collection has a parent in its route, add that to its class name.
 				if ( '' !== parentName && parentName !== routeName && routeModel.get( 'versionString' ) !== parentName ) {
 
 					collectionClassName = wp.api.utils.capitalizeAndCamelCaseDashes( parentName ) + wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
 					modelClassName      = mapping.models[ collectionClassName ] || collectionClassName;
 					collectionClassName = mapping.collections[ collectionClassName ] || collectionClassName;
 					loadingObjects.collections[ collectionClassName ] = wp.api.WPApiBaseCollection.extend( {
 
 						// Function that returns a constructed url passed on the parent.
 						url: function() {
 							return routeModel.get( 'apiRoot' ) + routeModel.get( 'versionString' ) +
 								parentName + '/' +
 								( ( _.isUndefined( this.parent ) || '' === this.parent ) ?
 									( _.isUndefined( this.get( 'parent_post' ) ) ? '' : this.get( 'parent_post' ) + '/' ) :
 									this.parent + '/' ) +
 								routeName;
 						},
 
 						// Specify the model that this collection contains.
 						model: function( attrs, options ) {
 							return new loadingObjects.models[ modelClassName ]( attrs, options );
 						},
 
 						// Track nonces at the Endpoint level.
 						nonce: function() {
 							return routeModel.get( 'nonce' );
 						},
 
 						endpointModel: routeModel,
 
 						// Include a reference to the original class name.
 						name: collectionClassName,
 
 						// Include a reference to the original route object.
 						route: collectionRoute,
 
 						// Include the array of route methods for easy reference.
 						methods: collectionRoute.route.methods
 					} );
 				} else {
 
 					// This is a collection without a parent in its route.
 					collectionClassName = wp.api.utils.capitalizeAndCamelCaseDashes( routeName );
 					modelClassName      = mapping.models[ collectionClassName ] || collectionClassName;
 					collectionClassName = mapping.collections[ collectionClassName ] || collectionClassName;
 					loadingObjects.collections[ collectionClassName ] = wp.api.WPApiBaseCollection.extend( {
 
 						// For the url of a root level collection, use a string.
 						url: function() {
 							return routeModel.get( 'apiRoot' ) + routeModel.get( 'versionString' ) + routeName;
 						},
 
 						// Specify the model that this collection contains.
 						model: function( attrs, options ) {
 							return new loadingObjects.models[ modelClassName ]( attrs, options );
 						},
 
 						// Track nonces at the Endpoint level.
 						nonce: function() {
 							return routeModel.get( 'nonce' );
 						},
 
 						endpointModel: routeModel,
 
 						// Include a reference to the original class name.
 						name: collectionClassName,
 
 						// Include a reference to the original route object.
 						route: collectionRoute,
 
 						// Include the array of route methods for easy reference.
 						methods: collectionRoute.route.methods
 					} );
 				}
 
 				// Add defaults to the new model, pulled form the endpoint.
 				wp.api.utils.decorateFromRoute( collectionRoute.route.endpoints, loadingObjects.collections[ collectionClassName ] );
 			} );
 
 			// Add mixins and helpers for each of the models.
 			_.each( loadingObjects.models, function( model, index ) {
 				loadingObjects.models[ index ] = wp.api.utils.addMixinsAndHelpers( model, index, loadingObjects );
 			} );
 
 			// Set the routeModel models and collections.
 			routeModel.set( 'models', loadingObjects.models );
 			routeModel.set( 'collections', loadingObjects.collections );
 
 		}
 
 	} );
 
 	wp.api.endpoints = new Backbone.Collection();
 
 	/**
 	 * Initialize the wp-api, optionally passing the API root.
 	 *
 	 * @param {Object} [args]
 	 * @param {string} [args.nonce] The nonce. Optional, defaults to wpApiSettings.nonce.
 	 * @param {string} [args.apiRoot] The api root. Optional, defaults to wpApiSettings.root.
 	 * @param {string} [args.versionString] The version string. Optional, defaults to wpApiSettings.root.
 	 * @param {Object} [args.schema] The schema. Optional, will be fetched from API if not provided.
 	 */
 	wp.api.init = function( args ) {
 		var endpoint, attributes = {}, deferred, promise;
 
 		args                      = args || {};
 		attributes.nonce          = _.isString( args.nonce ) ? args.nonce : ( wpApiSettings.nonce || '' );
 		attributes.apiRoot        = args.apiRoot || wpApiSettings.root || '/wp-json';
 		attributes.versionString  = args.versionString || wpApiSettings.versionString || 'wp/v2/';
 		attributes.schema         = args.schema || null;
 		attributes.modelEndpoints = args.modelEndpoints || [ 'me', 'settings' ];
 		if ( ! attributes.schema && attributes.apiRoot === wpApiSettings.root && attributes.versionString === wpApiSettings.versionString ) {
 			attributes.schema = wpApiSettings.schema;
 		}
 
 		if ( ! initializedDeferreds[ attributes.apiRoot + attributes.versionString ] ) {
 
 			// Look for an existing copy of this endpoint.
 			endpoint = wp.api.endpoints.findWhere( { 'apiRoot': attributes.apiRoot, 'versionString': attributes.versionString } );
 			if ( ! endpoint ) {
 				endpoint = new Endpoint( attributes );
 			}
 			deferred = jQuery.Deferred();
 			promise = deferred.promise();
 
 			endpoint.schemaConstructed.done( function( resolvedEndpoint ) {
 				wp.api.endpoints.add( resolvedEndpoint );
 
 				// Map the default endpoints, extending any already present items (including Schema model).
 				wp.api.models      = _.extend( wp.api.models, resolvedEndpoint.get( 'models' ) );
 				wp.api.collections = _.extend( wp.api.collections, resolvedEndpoint.get( 'collections' ) );
 				deferred.resolve( resolvedEndpoint );
 			} );
 			initializedDeferreds[ attributes.apiRoot + attributes.versionString ] = promise;
 		}
 		return initializedDeferreds[ attributes.apiRoot + attributes.versionString ];
 	};
 
 	/**
 	 * Construct the default endpoints and add to an endpoints collection.
 	 */
 
 	// The wp.api.init function returns a promise that will resolve with the endpoint once it is ready.
 	wp.api.loadPromise = wp.api.init();
 
 } )();