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'use strict';
define(['jquery', 'underscore', 'backbone', 'routing'], function ($, _, Backbone, Routing) {
return Backbone.Model.extend({
entityListPromise: null,
entityPromises: {},
/**
* @param {Object} options
*/
initialize: function (options) {
this.entityListPromise = null;
this.entityPromises = {};
this.options = options || {};
},
/**
* Fetch all elements of the collection
*
* @return {Promise}
*/
fetchAll: function (searchOptions) {
if (!this.entityListPromise) {
Iif (!_.has(this.options.urls, 'list')) {
return $.Deferred().reject().promise();
}
this.entityListPromise = $.getJSON(
Routing.generate(this.options.urls.list, searchOptions),
).then(_.identity).promise();
}
return this.entityListPromise;
},
/**
* Search elements of the collection
*
* @return {Promise}
*/
search: function (searchOptions) {
var url = '';
if (!_.has(this.options.urls, 'search')) {
Iif (!_.has(this.options.urls, 'list')) {
return $.Deferred().reject().promise();
} else {
url = this.options.urls.list;
}
} else {
url = this.options.urls.search;
}
return this.getJSON(url, searchOptions).then(_.identity).promise();
},
/**
* Fetch an element based on its identifier
*
* @param {string} identifier
* @param {Object} options
*
* @return {Promise}
*/
fetch: function (identifier, options) {
options = options || {};
if (!(identifier in this.entityPromises) || false === options.cached) {
var deferred = $.Deferred();
if (this.options.urls.get && !options.force_list_method) {
$.getJSON(
Routing.generate(this.options.urls.get, _.extend({identifier: identifier}, options))
).then(_.identity).done(function (entity) {
deferred.resolve(entity);
}).fail(function (promise, status, error) {
console.error('Error during fetching: ', error);
return deferred.reject(promise);
});
} else {
this.fetchAll().done(function (entities) {
var entity = _.findWhere(entities, {code: identifier});
Eif (entity) {
deferred.resolve(entity);
} else {
deferred.reject();
}
});
}
this.entityPromises[identifier] = deferred.promise();
}
return this.entityPromises[identifier];
},
/**
* Fetch all entities for the given identifiers
*
* @param {Array} identifiers
*
* @return {Promise}
*/
fetchByIdentifiers: function (identifiers, options) {
options = options || {};
if (0 === identifiers.length) {
return $.Deferred().resolve([]).promise();
}
var uncachedIdentifiers = _.difference(identifiers, _.keys(this.entityPromises));
if (0 === uncachedIdentifiers.length) {
return this.getObjects(_.pick(this.entityPromises, identifiers));
}
return $.when(
this.getJSON(
this.options.urls.list,
_.extend({identifiers: uncachedIdentifiers.join(',')}, options)
).then(_.identity),
this.getIdentifierField()
).then(function (entities, identifierCode) {
_.each(entities, function (entity) {
this.entityPromises[entity[identifierCode]] = $.Deferred().resolve(entity).promise();
}.bind(this));
return this.getObjects(_.pick(this.entityPromises, identifiers));
}.bind(this));
},
/**
* Get the list of elements in JSON format.
*
* @param {string} url
* @param {Object} parameters
*
* @returns {Promise}
*/
getJSON: function (url, parameters) {
return $.getJSON(Routing.generate(url, parameters));
},
/**
* Get the identifier attribute of the collection
*
* @return {Promise}
*/
getIdentifierField: function () {
return $.Deferred().resolve('code');
},
/**
* Clear cache of the fetcher
*
* @param {string|null} identifier
*/
clear: function (identifier) {
if (identifier) {
delete this.entityPromises[identifier];
} else {
this.entityListPromise = null;
this.entityPromises = {};
}
},
/**
* Wait for promises to resolve and return the promises results wrapped in a Promise
*
* @param {Array|Object} promises
*
* @return {Promise}
*/
getObjects: function (promises) {
return $.when.apply($, _.toArray(promises)).then(function () {
return 0 !== arguments.length ? _.toArray(arguments) : [];
});
}
});
});
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