rest: add API schema

Now, the REST API is exposing a schema endpoint at /api/v1/schema/.
This makes it possible to dynamically interact with API through
the coreapi command line tool.

Message-Id: <20180308162213.5193-1-shubhamjain7495@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

api/urls.py

@@ -11,6 +11,7 @@
 from django.conf.urls import url, include
 from rest_framework.routers import DefaultRouter
 from rest_framework_nested.routers import NestedDefaultRouter
+from rest_framework.schemas import get_schema_view
 
 from . import views
 from . import rest
@@ -36,9 +37,12 @@ def _build_urls(base=None, r=[]):
 projects_router.register('series', rest.ProjectSeriesViewSet, base_name='series')
 projects_router.register('messages', rest.MessagesViewSet, base_name='messages')
 
+schema_view = get_schema_view(title='API schema')
+
 urlpatterns = _build_urls() + [
         url(r"v1/", include(router.urls)),
         url(r"v1/", include(projects_router.urls)),
+        url(r'^v1/schema/$', schema_view),
         # Use the base class's handler by default
         url(r".*", views.APIView.as_view())
     ]

requirements.txt

@@ -5,3 +5,4 @@ django-debug-toolbar==1.8
 gunicorn>=19
 djangorestframework>=3.0.0
 drf-nested-routers
+coreapi-cli