djangorestframework-jsonapi 2.0.0-alpha

A Django REST framework API adapter for the json-api spec.

====================================
JSON API and Django Rest Framework
====================================

.. image:: https://travis-ci.org/django-json-api/rest_framework_ember.svg?branch=develop
:target: https://travis-ci.org/django-json-api/rest_framework_ember

By default, Django REST Framework will produce a response like::

{
"count": 20,
"next": "http://example.com/api/1.0/identities/?page=3",
"previous": "http://example.com/api/1.0/identities/?page=1",
"results": [{
"id": 3,
"username": "john",
"full_name": "John Coltrane"
}]
}


However, for an ``identity`` model in JSON API format the response should look
like the following::

{
"links": {
"prev": "http://example.com/api/1.0/identities",
"self": "http://example.com/api/1.0/identities?page=2",
"next": "http://example.com/api/1.0/identities?page=3",
},
"data": [{
"type": "identities",
"id": 3,
"attributes": {
"username": "john",
"full-name": "John Coltrane"
}
}],
"meta": {
"pagination": {
"count": 20
}
}
}


------------
Requirements
------------

1. Django
2. Django REST Framework

------------
Installation
------------

From PyPI
^^^^^^^^^

::

pip install rest_framework_json_api


From Source
^^^^^^^^^^^

::

$ git clone https://github.com/django-json-api/rest_framework_json_api.git
$ cd rest_framework_json_api && pip install -e .


Running Tests
^^^^^^^^^^^^^

::

$ python runtests.py


-----
Usage
-----


``rest_framework_json_api`` assumes you are using class-based views in Django
Rest Framework.


Settings
^^^^^^^^

One can either add ``rest_framework_json_api.parsers.JSONParser`` and
``rest_framework_json_api.renderers.JSONRenderer`` to each ``ViewSet`` class, or
override ``settings.REST_FRAMEWORK``::


REST_FRAMEWORK = {
'PAGINATE_BY': 10,
'PAGINATE_BY_PARAM': 'page_size',
'MAX_PAGINATE_BY': 100,
# DRF v3.1+
'DEFAULT_PAGINATION_CLASS':
'rest_framework_json_api.pagination.PageNumberPagination',
# older than DRF v3.1
'DEFAULT_PAGINATION_SERIALIZER_CLASS':
'rest_framework_json_api.pagination.PaginationSerializer',
'DEFAULT_PARSER_CLASSES': (
'rest_framework_json_api.parsers.JSONParser',
'rest_framework.parsers.FormParser',
'rest_framework.parsers.MultiPartParser'
),
'DEFAULT_RENDERER_CLASSES': (
'rest_framework_json_api.renderers.JSONRenderer',
'rest_framework.renderers.BrowsableAPIRenderer',
),
}

If ``PAGINATE_BY`` is set the renderer will return a ``meta`` object with
record count and a ``links`` object with the next and previous links. Pages
can be specified with the ``page`` GET parameter.

resource_name property
^^^^^^^^^^^^^^^^^^^^^^

You may manually set the ``resource_name`` property on views or serializers to
specify the ``type`` key in the json output. It is automatically set for you as the
plural of the view or model name except on resources that do not subclass
``rest_framework.viewsets.ModelViewSet``::

class Me(generics.GenericAPIView):
"""
Current user's identity endpoint.

GET /me
"""
resource_name = 'users'
serializer_class = identity_serializers.IdentitySerializer
allowed_methods = ['GET']
permission_classes = (permissions.IsAuthenticated, )


Object Key Formats
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
*(dasherize/camelize/underscore/pluralize)*

This package includes the ability (off by default) to automatically convert json
requests and responses from the python/rest_framework's preferred underscore to
a format of your choice. To hook this up include the following in your project
settings::

JSON_API_FORMAT_KEYS = True

Note: due to the way the inflector works address_1 can camelize to address1
on output but it cannot convert address1 back to address_1 on POST or PUT. Keep
this in mind when naming fields with numbers in them.


Example - Without format conversion::

{
"data": [{
"type": "identities",
"id": 3,
"attributes": {
"username": "john",
"first_name": "John",
"last_name": "Coltrane",
"full_name": "John Coltrane"
},
}],
"meta": {
"pagination": {
"count": 20
}
}
}

Example - With format conversion set to ``dasherize``::

{
"data": [{
"type": "identities",
"id": 3,
"attributes": {
"username": "john",
"first-name": "John",
"last-name": "Coltrane",
"full-name": "John Coltrane"
},
}],
"meta": {
"pagination": {
"count": 20
}
}
}


Managing the trailing slash
^^^^^^^^^^^^^^^^^^^^^^^^^^^

By default Django expects a trailing slash on urls and will 301 redirect any
requests lacking a trailing slash. You can change the server side by
instantiating the Django REST Framework's router like so::

router = routers.SimpleRouter(trailing_slash=False)

If you aren't using SimpleRouter you can instead set APPEND_SLASH = False
in Django's settings.py file and modify url pattern regex to match routes
without a trailing slash.

If you prefer to make the change on the client side then add an
application adapter to your Ember app and override the buildURL method::

App.ApplicationAdapter = DS.RESTAdapter.extend({
buildURL: function() {
var url = this._super.apply(this, arguments);
if (url.charAt(url.length -1) !== '/') {
url += '/';
}
return url;
}
});

Displaying Server Side Validation Messages
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Ember Data does not ship with a default implementation of a validation error
handler except in the Rails ActiveModelAdapter so to display validation errors
you will need to add a small client adapter::

App.ApplicationAdapter = DS.RESTAdapter.extend({
ajaxError: function(jqXHR) {
var error = this._super(jqXHR);
if (jqXHR && jqXHR.status === 400) {
var response = Ember.$.parseJSON(jqXHR.responseText),
errors = {},
keys = Ember.keys(response);
if (keys.length === 1) {
var jsonErrors = response[keys[0]];
Ember.EnumerableUtils.forEach(Ember.keys(jsonErrors), function(key) {
errors[key] = jsonErrors[key];
});
}
return new DS.InvalidError(errors);
} else {
return error;
}
}
});

The adapter above will handle the following response format when the response has
a 400 status code. The root key ("post" in this example) is discarded::

{
"post": {
"slug": ["Post with this Slug already exists."]
}
}

To display all errors add the following to the template::

{{#each message in errors.messages}}
{{message}}
{{/each}}

To display a specific error inline use the following::

{{#each errors.title}}
<div class="error">{{message}}</div>
{{/each}}
{{input name="title" value=title}}


---------------------
Sideloading Resources
---------------------

If you are using the JSON Renderer globally, this can lead to issues
when hitting endpoints that are intended to sideload other objects.

For example::

{
"users": [],
"cars": []
}


Set the ``resource_name`` property on the object to ``False``, and the data
will be returned without modification.


------
Mixins
------

The following mixin classes are available to use with Rest Framework
resources.

rest_framework_json_api.mixins.MultipleIDMixin
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Overrides ``get_queryset`` to filter by ``ids[]`` in URL query params.