ember data serializer data mapping

问题:

I'm using ember & ember-data to try and consume a json feed from the server. Here is my code:

App = Ember.Application.create();  DS.RESTAdapter.configure(     "plurals", {         category: 'categories'     } );  App.Store = DS.Store.extend({     revision: 12,     adapter: DS.RESTAdapter.create({         url: 'app'     }) });  App.Router.map(function(){     this.resource('categories'); });  App.CategoriesRoute = Ember.Route.extend({     model: function() {         return App.Category.find();     } });  var attr = DS.attr;  App.Category = DS.Model.extend({     name: attr('string') });

Now this works fine with a testing server. Using the following JSON

{     "categories":[         {             "name":"Beef",             "id":1         },         {             "name":"Pork",             "id":2         }     ] }

However in production the server provide the following json:

{     "success":true,     "message":"Request successful",     "total":2,     "data":[         {             "name":"Beef",             "id":1         },         {             "name":"Pork",             "id":2         }     ] }

I can't for the life of me work out how to use the serializer to consume the live json. Any help would be appreciated. Thanks in advance.

UPDATE:

I've since tried to write the serializer but it doesn't appear to be working...

see below

App.Store = DS.Store.extend({     revision: 12,     adapter: DS.RESTAdapter.create({         url: 'app',         serializer: DS.RESTSerializer.extend({             extract: function(loader, json, type, record) {                 var root = 'data';                 this.sideload(loader, type, json, root);                 this.extractMeta(loader, type, json);                 if (json[root]) {                     if (record) { loader.updateId(record, json[root]); }                     this.extractRecordRepresentation(loader, type, json[root]);                 }             }         })     }) });

Which now produces this error Uncaught Error: assertion failed: Your server returned a hash with the key data but you have no mapping for it

回答1:

You have 2 options

• make your server compatible, and let it returns the json as ember data expects it,
• write your own adapter/serializer to support this format.

UPDATE: write your own serializer UPDATE 2: get rid of unused functions

https://github.com/emberjs/data/blob/master/packages/ember-data/lib/serializers/json_serializer.js#L196

You can inherit from the DS.RESTSerializer and change extract with this code

  extract: function(loader, json, type, record) {     var root = 'data';      if (json[root]) {       if (record) { loader.updateId(record, json[root]); }       this.extractRecordRepresentation(loader, type, json[root]);     }   }

This assumes that the content of request will always be under the data key of your json.

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