Class DS.ActiveModelAdapter

The ActiveModelAdapter is a subclass of the RESTAdapter designed to integrate with a JSON API that uses an underscored naming convention instead of camelCasing. It has been designed to work out of the box with the active_model_serializers Ruby gem. This Adapter expects specific settings using ActiveModel::Serializers, embed :ids, embed_in_root: true which sideloads the records.

This adapter extends the DS.RESTAdapter by making consistent use of the camelization, decamelization and pluralization methods to normalize the serialized JSON into a format that is compatible with a conventional Rails backend and Ember Data.

JSON Structure

The ActiveModelAdapter expects the JSON returned from your server to follow the REST adapter conventions substituting underscored keys for camelcased ones.

Unlike the DS.RESTAdapter, async relationship keys must be the singular form of the relationship name, followed by "id" for DS.belongsTo relationships, or "ids" for DS.hasMany relationships.

Conventional Names

Attribute names in your JSON payload should be the underscored versions of the attributes in your Ember.js models.

For example, if you have a Person model:

App.FamousPerson = DS.Model.extend({
  firstName: DS.attr('string'),
  lastName: DS.attr('string'),
  occupation: DS.attr('string')
});

The JSON returned should look like this:

{
  "famous_person": {
    "id": 1,
    "first_name": "Barack",
    "last_name": "Obama",
    "occupation": "President"
  }
}

Let's imagine that Occupation is just another model:

App.Person = DS.Model.extend({
  firstName: DS.attr('string'),
  lastName: DS.attr('string'),
  occupation: DS.belongsTo('occupation')
});

App.Occupation = DS.Model.extend({
  name: DS.attr('string'),
  salary: DS.attr('number'),
  people: DS.hasMany('person')
});

The JSON needed to avoid extra server calls, should look like this:

{
  "people": [{
    "id": 1,
    "first_name": "Barack",
    "last_name": "Obama",
    "occupation_id": 1
  }],

  "occupations": [{
    "id": 1,
    "name": "President",
    "salary": 100000,
    "person_ids": [1]
  }]
}

Show:

Module: ember-data
jqXHR
Object
returns

error

The ActiveModelAdapter overrides the handleResponse method to format errors passed to a DS.InvalidError for all 422 Unprocessable Entity responses.

A 422 HTTP response from the server generally implies that the request was well formed but the API was unable to process it because the content was not semantically correct or meaningful per the API.

For more information on 422 HTTP Error code see 11.2 WebDAV RFC 4918 https://tools.ietf.org/html/rfc4918#section-11.2

Module: ember-data
modelName
String
id
(String|Array|Object)

single id or array of ids or query

snapshot
(DS.Snapshot|Array)

single snapshot or array of snapshots

requestType
String
query
Object

object of query parameters to send for query requests.

returns
String

url

Builds a URL for a given type and optional ID.

By default, it pluralizes the type's name (for example, 'post' becomes 'posts' and 'person' becomes 'people'). To override the pluralization see pathForType.

If an ID is specified, it adds the ID to the path generated for the type, separated by a /.

When called by RESTAdapter.findMany() the id and snapshot parameters will be arrays of ids and snapshots.

Module: ember-data
payload
Object
returns
Object

an object formatted the way DS.Store understands

This method converts a JSON-API Resource Object to a format that DS.Store understands.

TODO: This method works as an interim until DS.Store understands JSON-API.

Module: ember-data
store
DS.Store
type
DS.Model
snapshot
DS.Snapshot
returns
Promise

promise

Called by the store when a newly created record is saved via the save method on a model record instance.

The createRecord method serializes the record and makes an Ajax (HTTP POST) request to a URL computed by buildURL.

See serialize for information on how to customize the serialized form of a record.

Module: ember-data
store
DS.Store
type
DS.Model
snapshot
DS.Snapshot
returns
Promise

promise

Called by the store when a record is deleted.

The deleteRecord method makes an Ajax (HTTP DELETE) request to a URL computed by buildURL.

Module: ember-data
store
DS.Store
type
DS.Model
sinceToken
String
snapshotRecordArray
DS.SnapshotRecordArray
returns
Promise

promise

The findAll() method is used to retrieve all records for a given type.

Example

app/adapters/application.js
import DS from 'ember-data';

export default DS.Adapter.extend({
  findAll: function(store, type, sinceToken) {
    var url = type;
    var query = { since: sinceToken };
    return new Ember.RSVP.Promise(function(resolve, reject) {
      jQuery.getJSON(url, query).then(function(data) {
        Ember.run(null, resolve, data);
      }, function(jqXHR) {
        jqXHR.then = null; // tame jQuery's ill mannered promises
        Ember.run(null, reject, jqXHR);
      });
    });
  }
});
Module: ember-data
store
DS.Store
snapshot
DS.Snapshot
url
String
returns
Promise

promise

Called by the store in order to fetch a JSON array for the unloaded records in a belongs-to relationship that were originally specified as a URL (inside of links).

For example, if your original payload looks like this:

{
  "person": {
    "id": 1,
    "name": "Tom Dale",
    "links": { "group": "/people/1/group" }
  }
}

This method will be called with the parent record and /people/1/group.

The findBelongsTo method will make an Ajax (HTTP GET) request to the originally specified URL.

Module: ember-data
store
DS.Store
snapshot
DS.Snapshot
url
String
returns
Promise

promise

Called by the store in order to fetch a JSON array for the unloaded records in a has-many relationship that were originally specified as a URL (inside of links).

For example, if your original payload looks like this:

{
  "post": {
    "id": 1,
    "title": "Rails is omakase",
    "links": { "comments": "/posts/1/comments" }
  }
}

This method will be called with the parent record and /posts/1/comments.

The findHasMany method will make an Ajax (HTTP GET) request to the originally specified URL.

Module: ember-data
store
DS.Store
type
DS.Model
ids
Array
snapshots
Array
returns
Promise

promise

Called by the store in order to fetch several records together if coalesceFindRequests is true

For example, if the original payload looks like:

{
  "id": 1,
  "title": "Rails is omakase",
  "comments": [ 1, 2, 3 ]
}

The IDs will be passed as a URL-encoded Array of IDs, in this form:

ids[]=1&ids[]=2&ids[]=3

Many servers, such as Rails and PHP, will automatically convert this URL-encoded array into an Array for you on the server-side. If you want to encode the IDs, differently, just override this (one-line) method.

The findMany method makes an Ajax (HTTP GET) request to a URL computed by buildURL, and returns a promise for the resulting payload.

Module: ember-data
store
DS.Store
type
DS.Model
id
String
snapshot
DS.Snapshot
returns
Promise

promise

Called by the store in order to fetch the JSON for a given type and ID.

The findRecord method makes an Ajax request to a URL computed by buildURL, and returns a promise for the resulting payload.

This method performs an HTTP GET request with the id provided as part of the query string.

Module: ember-data
store
DS.Store
type
DS.Model

the DS.Model class of the record

inputProperties
Object

a hash of properties to set on the newly created record.

returns
(String|Number)

id

If the globally unique IDs for your records should be generated on the client, implement the generateIdForRecord() method. This method will be invoked each time you create a new record, and the value returned from it will be assigned to the record's primaryKey.

Most traditional REST-like HTTP APIs will not use this method. Instead, the ID of the record will be set by the server, and your adapter will update the store with the new ID when it calls didCreateRecord(). Only implement this method if you intend to generate record IDs on the client-side.

The generateIdForRecord() method will be invoked with the requesting store as the first parameter and the newly created record as the second parameter:

generateIdForRecord: function(store, inputProperties) {
  var uuid = App.generateUUIDWithStatisticallyLowOddsOfCollision();
  return uuid;
}
Module: ember-data
store
DS.Store
snapshots
Array
returns
Array

an array of arrays of records, each of which is to be loaded separately by findMany.

Organize records into groups, each of which is to be passed to separate calls to findMany.

This implementation groups together records that have the same base URL but differing ids. For example /comments/1 and /comments/2 will be grouped together because we know findMany can coalesce them together as /comments?ids[]=1&ids[]=2

It also supports urls where ids are passed as a query param, such as /comments?id=1 but not those where there is more than 1 query param such as /comments?id=2&name=David Currently only the query param of id is supported. If you need to support others, please override this or the _stripIDFromURL method.

It does not group records that have differing base urls, such as for example: /posts/1/comments/2 and /posts/2/comments/3

Module: ember-data
status
Number
headers
Object
payload
Object
returns
Object | DS.AdapterError

response

Takes an ajax response, and returns the json payload or an error.

By default this hook just returns the json payload passed to it. You might want to override it in two cases:

  1. Your API might return useful results in the response headers. Response headers are passed in as the second argument.

  2. Your API might return errors as successful responses with status code 200 and an Errors text or object. You can return a DS.InvalidError or a DS.AdapterError (or a sub class) from this hook and it will automatically reject the promise and put your record into the invalid or error state.

Returning a DS.InvalidError from this method will cause the record to transition into the invalid state and make the errors object available on the record. When returning an DS.InvalidError the store will attempt to normalize the error data returned from the server using the serializer's extractErrors method.

Module: ember-data
status
Number
headers
Object
payload
Object
returns
Boolean

Default handleResponse implementation uses this hook to decide if the response is a an invalid error.

Module: ember-data
status
Number
headers
Object
payload
Object
returns
Boolean

Default handleResponse implementation uses this hook to decide if the response is a success.

Module: ember-data
serializer
DS.Serializer
store
DS.Store
modelClass
subclass of DS.Model
payload
Object
id
String|Number
requestType
String
returns
Object

JSON-API Document

This is a helper method that always returns a JSON-API Document.

If the current serializer has isNewSerializerAPI set to true this helper calls normalizeResponse instead of extract.

All the built-in serializers get isNewSerializerAPI set to true automatically if the feature flag is enabled.

Module: ember-data
modelName
String
returns

String

The ActiveModelAdapter overrides the pathForType method to build underscored URLs by decamelizing and pluralizing the object type name.

  this.pathForType("famousPerson");
  //=> "famous_people"
Module: ember-data
store
DS.Store
payload
Object
returns
DS.Model|Array

one or multiple records from data

Push a JSON-API Document to the store.

This will push both primary data located in data and secondary data located in included (if present).

Module: ember-data
store
DS.Store
payload
Object
returns
DS.Model|Array

one or multiple records from data

Push the primary data of a JSON-API Document to the store.

This method only pushes the primary data located in data.

Module: ember-data
store
DS.Store
payload
Object
returns
Array

an array containing zero or more records from included

Push the secondary data of a JSON-API Document to the store.

This method only pushes the secondary data located in included.

Module: ember-data
store
DS.Store
type
subclass of DS.Model
query
Object
returns
Promise

promise

The queryRecord() method is invoked when the store is asked for a single record through a query object.

In response to queryRecord() being called, you should always fetch fresh data. Once found, you can asynchronously call the store's push() method to push the record into the store.

Here is an example queryRecord implementation:

Example

app/adapters/application.js
import DS from 'ember-data';
import Ember from 'ember';

export default DS.Adapter.extend(DS.BuildURLMixin, {
  queryRecord: function(store, type, query) {
    var urlForQueryRecord = this.buildURL(type.modelName, null, null, 'queryRecord', query);

    return new Ember.RSVP.Promise(function(resolve, reject) {
      Ember.$.getJSON(urlForQueryRecord, query).then(function(data) {
        Ember.run(null, resolve, data);
      }, function(jqXHR) {
        jqXHR.then = null; // tame jQuery's ill mannered promises
        Ember.run(null, reject, jqXHR);
      });
    });
  }
});
Module: ember-data
snapshot
DS.Snapshot
options
Object
returns
Object

serialized snapshot

Proxies to the serializer's serialize method.

Example

app/adapters/application.js
import DS from 'ember-data';

export default DS.Adapter.extend({
  createRecord: function(store, type, snapshot) {
    var data = this.serialize(snapshot, { includeId: true });
    var url = type;

    // ...
  }
});
Module: ember-data
store
DS.Store
snapshotRecordArray
DS.SnapshotRecordArray
returns
Boolean

This method is used by the store to determine if the store should reload a record array after the store.findAll method resolves with a cached record array.

This method is only checked by the store when the store is returning a cached record array.

If this method returns true the store will re-fetch all records from the adapter.

Module: ember-data
store
DS.Store
snapshot
DS.Snapshot
returns
Boolean

This method is used by the store to determine if the store should reload a record after the store.findRecord method resolves a cached record.

This method is only checked by the store when the store is returning a cached record.

If this method returns true the store will re-fetch a record from the adapter.

Module: ember-data
store
DS.Store
snapshotRecordArray
DS.SnapshotRecordArray
returns
Boolean

This method is used by the store to determine if the store should reload all records from the adapter when records are requested by store.findAll.

If this method returns true, the store will re-fetch all records from the adapter. If this method returns false, the store will resolve immediately using the cached record.

Module: ember-data
store
DS.Store
snapshot
DS.Snapshot
returns
Boolean

This method is used by the store to determine if the store should reload a record from the adapter when a record is requested by store.findRecord.

If this method returns true, the store will re-fetch a record from the adapter. If this method returns false, the store will resolve immediately using the cached record.

Module: ember-data
obj
Object
returns
Object

By default, the RESTAdapter will send the query params sorted alphabetically to the server.

For example:

  store.query('posts', { sort: 'price', category: 'pets' });

will generate a requests like this /posts?category=pets&sort=price, even if the parameters were specified in a different order.

That way the generated URL will be deterministic and that simplifies caching mechanisms in the backend.

Setting sortQueryParams to a falsey value will respect the original order.

In case you want to sort the query parameters with a different criteria, set sortQueryParams to your custom sort function.

app/adapters/application.js
import DS from 'ember-data';

export default DS.RESTAdapter.extend({
  sortQueryParams: function(params) {
    var sortedKeys = Object.keys(params).sort().reverse();
    var len = sortedKeys.length, newParams = {};

    for (var i = 0; i < len; i++) {
      newParams[sortedKeys[i]] = params[sortedKeys[i]];
    }
    return newParams;
  }
});
Module: ember-data
store
DS.Store
type
DS.Model
snapshot
DS.Snapshot
returns
Promise

promise

Called by the store when an existing record is saved via the save method on a model record instance.

The updateRecord method serializes the record and makes an Ajax (HTTP PUT) request to a URL computed by buildURL.

See serialize for information on how to customize the serialized form of a record.

Module: ember-data
modelName
String
snapshot
DS.Snapshot
returns
String

url

Module: ember-data
id
String
modelName
String
snapshot
DS.Snapshot
returns
String

url

Module: ember-data
id
String
modelName
String
snapshot
DS.Snapshot
returns
String

url

Module: ember-data
modelName
String
returns
String

url

Module: ember-data
id
String
modelName
String
returns
String

url

Module: ember-data
id
String
modelName
String
returns
String

url

Module: ember-data
ids
Array
modelName
String
snapshots
Array
returns
String

url

Module: ember-data
query
Object
modelName
String
returns
String

url

Module: ember-data
query
Object
modelName
String
returns
String

url

Module: ember-data
id
String
modelName
String
snapshot
DS.Snapshot
returns
String

url

Module: ember-data
doc
Object

JSON API document

returns
Array

An array of errors found in the document structure

This is a helper method that validates a JSON API top-level document

The format of a document is described here: http://jsonapi.org/format/#document-top-level