anchor.diff:  1
   ----
   
  -In other case, you can execute queries using postgresql operators thaks tu
  -django's queryset `.extra()` method:
  -
  -[source, python]
  +.Same example but using Django < 1.7
  +[source, pycon]
   ----
   >>> Something.objects.extra(where=["data->>'name' = %s"], params=["foo"]).count()
   1
   ----
   
   
  +Array length lookup
  +^^^^^^^^^^^^^^^^^^^
  +
  +With same data as previous example:
  +
  +.With Django >= 1.7
  +[source, pycon]
  +----
  +>>> Something.objects.filter(data__array_length=4).count()
  +2
  +----
  +
  +
  +.With Django < 1.7
  +[source, pycon]
  +----
  +>>> Something.objects.extra(where=["json_array_length(data) = %s"],
  +...                         params=["foo"]).count()
  +2
  +----
  +
  +
   NOTE: At this momment, with postgresql 9.3 as last stable version there is only a
  -limited set of native operators for json type. When postgresql 9.4 is released, 
  +limited set of native operators for json type. When postgresql 9.4 is released,
   more lookups will be added.
   
   
  
positive.code: 1
  ----
  
  It also works for array indexes:
  
  [source, pycon]
  ----
  >>> Something.object.bulk_create([
  
negative.code: Querying
  ~~~~~~~~
  
  Key or Index lookup
  ^^^^^^^^^^^^^^^^^^^
  
  .If you are using django 1.7, you can use index or key lookup for filtering
  [source, pycon]
  ----
  >>> Something.object.bulk_create([
  