drf-nested-resources 1.2b1

# drf-nested-resources

This is a django rest framework extension to allow developers to create nested
resources.

## How to use

### Configuration of nested resources

For this example we are going to create a simple API with the following
endpoints:

/developers/
/developers/<id>
/developers/<id>/languages/
/developers/<id>/languages/<id>

First we start with the following Django models:

```python
from django.db.models.base import Model
from django.db.models.fields import CharField
from django.db.models.fields.related import ForeignKey


class Developer(Model):

name = CharField(max_length=20)


class ProgrammingLanguage(Model):

name = CharField(max_length=20)

author = ForeignKey(Developer, related_name='programming_languages')
```

We will have the two viewsets for both the `developers` and `languages` resource
collections.

```python
from rest_framework.viewsets import ModelViewSet
from drf_nested_resources.fields import HyperlinkedNestedModelSerializer


class _DeveloperSerializer(HyperlinkedNestedModelSerializer):

class Meta(object):

model = Developer

fields = ('url', 'name', 'programming_languages')


class DeveloperViewSet(ModelViewSet):

queryset = Developer.objects.all()

serializer_class = _DeveloperSerializer


class _ProgrammingLanguageSerializer(HyperlinkedNestedModelSerializer):

class Meta(object):

model = ProgrammingLanguage

fields = ('url', 'name', 'author')


class ProgrammingLanguageViewSet(ModelViewSet):

queryset = ProgrammingLanguage.objects.all()

serializer_class = _ProgrammingLanguageSerializer
```

The related fields in the ViewSets `author` and `programming_languages` should
follow the model representation so that `author` will give us a url for the
developer who wrote the ProgrammingLanguage and the `programming_languages`
should give us a list of urls for the ProgrammingLanguages that the Developer
wrote.

This is how you would generate the urlpatterns for them:

```python
_RESOURCES = [
Resource(
'developer',
'developers',
DeveloperViewSet,
[
NestedResource(
'language',
'languages',
ProgrammingLanguageViewSet,
parent_field_lookup='author',
)
],
),
]
urlpatterns = make_urlpatterns_from_resources(_RESOURCES)
```

For more examples of different relationships and authorization check the test
suite.

Changelog
=========

Version 1.2 Beta 1
------------------

Implemented ability to force a field value in a nested resource to be set to
the URL of an ascending resource. This is done using the optional attribute
``field_forced_to_ancestor`` on the serializer's ``Meta`` class.


Version 1.1
-----------

Re-worked the mechanism for URL generation to support cross-linking resource
trees.

**Breaking change**: Any previous usage of many-to-many fields on variables
in the current request's URL will now break.


Version 1.0 Release Candidate 3
-------------------------------

Added proper support for namespaced URLs


Version 1.0 Release Candidate 1
-------------------------------

Added support for Django 1.10 and Rest Framework 3.4.3


Version 1.0 Beta 1 (unreleased)
-------------------------------

Initial release.