Created
August 20, 2012 19:36
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// Map from CRUD to HTTP for our default `Backbone.sync` implementation. | |
var methodMap = { | |
'create': 'POST', | |
'update': 'PUT', | |
'delete': 'DELETE', | |
'read': 'GET' | |
}; | |
// Override this function to change the manner in which Backbone persists | |
// models to the server. You will be passed the type of request, and the | |
// model in question. By default, makes a RESTful Ajax request | |
// to the model's `url()`. Some possible customizations could be: | |
// | |
// * Use `setTimeout` to batch rapid-fire updates into a single request. | |
// * Send up the models as XML instead of JSON. | |
// * Persist models via WebSockets instead of Ajax. | |
// | |
// Turn on `Backbone.emulateHTTP` in order to send `PUT` and `DELETE` requests | |
// as `POST`, with a `_method` parameter containing the true HTTP method, | |
// as well as all requests with the body as `application/x-www-form-urlencoded` | |
// instead of `application/json` with the model in a param named `model`. | |
// Useful when interfacing with server-side languages like **PHP** that make | |
// it difficult to read the body of `PUT` requests. | |
Backbone.sync = function(method, model, options) { | |
var type = methodMap[method]; | |
// Default options, unless specified. | |
options || (options = {}); | |
// Default JSON-request options. | |
var params = {type: type, dataType: 'json'}; | |
// Ensure that we have a URL. | |
if (!options.url) { | |
params.url = getValue(model, 'url') || urlError(); | |
} | |
// Ensure that we have the appropriate request data. | |
if (!options.data && model && (method == 'create' || method == 'update')) { | |
params.contentType = 'application/json'; | |
params.data = JSON.stringify(model.toJSON()); | |
} | |
// For older servers, emulate JSON by encoding the request into an HTML-form. | |
if (Backbone.emulateJSON) { | |
params.contentType = 'application/x-www-form-urlencoded'; | |
params.data = params.data ? {model: params.data} : {}; | |
} | |
// For older servers, emulate HTTP by mimicking the HTTP method with `_method` | |
// And an `X-HTTP-Method-Override` header. | |
if (Backbone.emulateHTTP) { | |
if (type === 'PUT' || type === 'DELETE') { | |
if (Backbone.emulateJSON) params.data._method = type; | |
params.type = 'POST'; | |
params.beforeSend = function(xhr) { | |
xhr.setRequestHeader('X-HTTP-Method-Override', type); | |
}; | |
} | |
} | |
// Don't process data on a non-GET request. | |
if (params.type !== 'GET' && !Backbone.emulateJSON) { | |
params.processData = false; | |
} | |
// Make the request, allowing the user to override any Ajax options. | |
return $.ajax(_.extend(params, options)); | |
}; |
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