add a doc on authorization to the Django section

Author: defrex

docs/config.toml

@@ -21,6 +21,7 @@ ga = "UA-12613282-7"
 	name = "Django"
 	pages = [
 	  "/docs/django/tutorial/",
+	  "/docs/django/authorization/",
 	  "/docs/django/filtering/",
 	]
 

docs/pages/docs/django/authorization.md

@@ -0,0 +1,113 @@
+---
+title: Authorization
+description: Details on how to restrict data access
+---
+
+# Authorization in Django
+
+There are two main ways you may want to limit access to data when working
+with Graphene and Django: limiting which fields are accessible via GraphQL
+and limiting which objects a user can access.
+
+Let's use a simple example model.
+
+```python
+from django.db import models
+
+class Post(models.Model):
+    name = models.CharField(max_length=100)
+    content = models.TextField()
+    published = models.BooleanField(default=False)
+    owner = models.ForeignKey('auth.User')
+```
+
+## Limiting Field Access
+
+This is easy, simply use the `only_fields` meta attribute.
+
+```python
+from graphene.contrib.django.types import DjangoNode
+from .models import Post
+
+class PostNode(DjangoNode):
+    class Meta:
+        model = Post
+        only_fields = ('title', 'content')
+```
+
+## Queryset Filtering On Lists
+
+In order to filter which objects are available in a queryset-based list,
+define a resolve method for that field and return the desired queryset.
+
+```python
+from graphene import ObjectType
+from graphene.contrib.django.filter import DjangoFilterConnectionField
+from .models import Post
+
+class Query(ObjectType):
+    all_posts = DjangoFilterConnectionField(CategoryNode)
+
+    class Meta:
+        abstract = True
+
+    def resolve_all_posts(self, args, info):
+        return Post.objects.filter(published=True)
+```
+
+## User-based Queryset Filtering
+
+If you are using `graphql-django-view` you can access Django's request object
+via `info.request_context`.
+
+```python
+from graphene import ObjectType
+from graphene.contrib.django.filter import DjangoFilterConnectionField
+from .models import Post
+
+class Query(ObjectType):
+    my_posts = DjangoFilterConnectionField(CategoryNode)
+
+    class Meta:
+        abstract = True
+
+    def resolve_my_posts(self, args, info):
+        if not info.request_context.user.is_authenticated():
+            return []
+        else:
+            return Post.objects.filter(owner=info.request_context.user)
+```
+
+If you're using your own view, passing the request context into the schema is
+simple.
+
+```python
+result = schema.execute(query, request_context=request)
+```
+
+## Filtering ID-based node access
+
+In order to add authorization to id-based node access, we need to add a method
+to your `DjangoNode`.
+
+```python
+from graphene.contrib.django.types import DjangoNode
+from .models import Post
+
+class PostNode(DjangoNode):
+    class Meta:
+        model = Post
+        only_fields = ('title', 'content')
+
+    @classmethod
+    def get_node(Cls, id, info):
+        try:
+            post = Cls._meta.model.objects.get(id=id)
+        except Cls._meta.model.DoesNotExist:
+            return None
+
+        if post.published or info.request_context.user is post.owner:
+            return Cls(instance)
+        else:
+            return None
+```