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backbone.service.js
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backbone.service.js
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(function (factory) {
if (typeof exports === 'object') {
module.exports = factory(require('underscore'), require('backbone'));
} else if (typeof define === 'function' && define.amd) {
define(['underscore', 'backbone'], factory);
} else {
factory(_, Backbone);
}
})(function (_, Backbone) {
"use strict";
function Service(options) {
var syncImpl = "sync_";
this[syncImpl] = {};
this.options = options || {};
var syncImplementations = parseTargets(this.options.sync || {});
_(syncImplementations).each(_.partial(this.createMethod, this[syncImpl]), this);
this.targets = parseTargets(this.options.targets || {});
_(this.targets).each(_.partial(this.createMethod, this), this);
this.sync = function (method, model, options) {
var mappedSync = this[syncImpl][method];
if (_.isFunction(mappedSync)) return mappedSync.call(this, {}, options);
else return Backbone.sync(method, model, options);
}
}
Service.sendModels = true;
Service.url = "";
Service.prototype.createMethod = function (parent, target) {
var promise, method, self = this;
parent[target.name] = function (data, options) {
promise = new Promise(self);
if (_.isFunction(target.data)) {
// data map function should process data entirely
data = target.data(this, data);
} else if (Service.sendModels && methodMap[target.method.toUpperCase()] != 'read') {
// if data is not a function, but we want to send model with each request
data = _.extend(this.toJSON(), data, target.data);
} else {
// otherwise just concat all data together; if no data exists, then model will be sent from Backbone.sync
data = _.extend({}, data, target.data);
}
options = self.createOptions(promise, target, options, this);
if (data && !_.isEmpty(data)) {
// only for non-get
if (!Backbone.emulateJSON && methodMap[target.method.toUpperCase()] != 'read') {
data = JSON.stringify(data);
options.contentType = 'application/json';
}
options.data = data;
}
options.type = target.method.toUpperCase();
if (_.find(_.values(methodMap), function(method){ return method === target.name; })) {
method = target.name;
} else {
method = methodMap[options.type];
}
Backbone.sync(method, this, options);
return promise;
}
};
Service.prototype.createOptions = function (promise, target, options, model) {
var self = this;
options || (options = {});
var path;
if (_.isFunction(target.path)) path = target.path(model, options);
else path = target.path;
var url = _.result(this.options, 'url') || Service.url;
return {
url: url + path,
success: function (resp, status, xhr) {
options.success && options.success.call(self, resp);
promise.resolve(resp);
},
error: function (xhr, status, error) {
options.error && options.error.apply(self, [error, xhr]);
promise.reject(error, xhr);
}
};
};
var methodMap = {
'POST': 'create',
'PUT': 'update',
'DELETE': 'delete',
'GET': 'read'
};
function parseTargets(targets) {
var target, defaultMethod = "GET";
return _(targets).map(function (props, name) {
target = { name: name, path: props, method: defaultMethod };
if (_.isObject(props) && !_.isFunction(props)) {
_.extend(target, { path: props.path, method: props.method || defaultMethod, data: props.data });
}
return target;
});
}
_.extend(Service.prototype, Backbone.Events);
Backbone.Service = Service;
// simple promise implementation
function Promise(context) {
this.context = context || this;
this.success = [];
this.error = [];
}
Promise.prototype = {
constructor: Promise,
then: function (success, error) {
if (success) {
if (this.resolved) {
success.apply(this.context, this.resolved);
}
else {
this.success.push(success);
}
}
if (error) {
if (this.rejected) {
error.apply(this.context, this.rejected);
}
else {
this.error.push(error);
}
}
return this;
},
resolve: function () {
var callback;
this.resolved = arguments;
this.error = [];
while (callback = this.success.shift()) {
callback.apply(this.context, this.resolved);
}
},
reject: function () {
var callback;
this.rejected = arguments;
this.success = [];
while (callback = this.error.shift()) {
callback.apply(this.context, this.rejected);
}
}
};
});
//(Backbone);