Updated documentation referencing middleware

Author: syrusakbary

docs/config.toml

@@ -17,6 +17,7 @@ ga = "UA-12613282-7"
     "/docs/basic-types/",
     "/docs/enums/",
     "/docs/relay/",
+    "/docs/middleware/",
   ]
 
 [docs.django]

docs/pages/docs/django/debug.md

@@ -13,14 +13,19 @@ For that, you will need to add the plugin in your graphene schema.
 
 ## Installation
 
-For use the Django Debug plugin in Graphene, just import `DjangoDebugPlugin` and add it to the `plugins` argument when you initiate the `Schema`.
+For use the Django Debug plugin in Graphene:
+* Import `DjangoDebugMiddleware` and add it to the `middleware` argument when you initiate the `Schema`.
+* Add the `debug` field into the schema root `Query` with the value `graphene.Field(DjangoDebug, name='__debug')`.
 
 
 ```python
-from graphene.contrib.django.debug import DjangoDebugPlugin
+from graphene.contrib.django.debug import DjangoDebugMiddleware, DjangoDebug
 
-# ...
-schema = graphene.Schema(query=Query, plugins=[DjangoDebugPlugin()])
+class Query(graphene.ObjectType):
+    # ...
+    debug = graphene.Field(DjangoDebug, name='__debug')
+
+schema = graphene.Schema(query=Query, middlewares=[DjangoDebugMiddleware()])
 ```
 
 This plugin, will add another field in the `Query` named `__debug`.

docs/pages/docs/middleware.md

@@ -0,0 +1,43 @@
+---
+title: Middleware
+description: Walkthrough Middleware
+---
+
+# Middleware
+
+You can use _middleware_ to affect the evaluation of fields in your schema.
+
+A middleware is any object that responds to `resolve(*args, next_middleware)`. Inside that method, it should either:
+
+* Send `resolve` to the next middleware to continue the evaluation; or
+* Return a value to end the evaluation early.
+
+Middlewares' `resolve` is invoked with several arguments:
+
+* `next` represents the execution chain. Call `next` to continue evalution.
+* `root` is the root value object passed throughout the query
+* `args` is the hash of arguments passed to the field
+* `context` is the context object passed throughout the query
+* `info` is the resolver info
+
+Add a middleware to a schema by adding to the `middlewares` list.
+
+
+### Example: Authorization
+
+This middleware only continues evaluation if the `field_name` is not `'user'`:
+
+```python
+class AuthorizationMiddleware(object):
+
+    def resolve(self, next, root, args, context, info):
+        if info.field_name == 'user':
+            return None
+        return next(root, args, context, info)
+```
+
+Then, add the middleware to your schema:
+
+```python
+schema = Schema(middlewares=[AuthorizationMiddleware])
+```