Add JsonVideoContent

* `JsonVideoContent` integrates with the `render_json` extension in
  `feincms-extensions`.

videos/content.py

@@ -61,3 +61,29 @@ def render(self, **kwargs):
             self.get_context_data(**kwargs),
             context_instance=kwargs.get('context'),
         )
+
+
+class JsonVideoContent(VideoContent):
+    class Meta(VideoContent.Meta):
+        abstract = True
+
+    def json(self):
+        """Return a json serializable representation of the video."""
+        video = self.video
+
+        def source_json(source):
+            """Return a json serializable representation of a video source."""
+            return {
+                'file': source.file.url,
+                'type': source.type,
+            }
+
+        return {
+            'created': video.created,
+            'length': video.length,
+            'preview': video.preview.url,
+            'recorded': video.recorded,
+            'slug': video.slug,
+            'sources': [source_json(source) for source in video.sources.all()],
+            'title': video.title,
+        }

videos/tests/factories.py

@@ -17,3 +17,4 @@ class VideoFactory(factory.DjangoModelFactory):
     title = factory.Sequence('Video {}'.format)
     slug = factory.Sequence('video-{}'.format)
     captions_file = 'captionfile.txt'
+    preview = factory.django.FileField(from_path='videos/tests/files/image.png')

videos/tests/models.py

@@ -1,6 +1,6 @@
 from feincms.models import create_base_model
 
-from ..content import VideoContent
+from ..content import JsonVideoContent, VideoContent
 from ..models import Video
 
 
@@ -20,3 +20,6 @@ class DummyPage(create_base_model()):
 DummyPage.create_content_type(VideoContent, TYPE_CHOICES=(
     ('block', 'Block'),
 ))
+DummyPage.create_content_type(JsonVideoContent, TYPE_CHOICES=(
+    ('block', 'Block'),
+))

videos/tests/test_content.py

@@ -3,7 +3,7 @@
 
 from . import factories
 from .models import DummyPage
-from ..content import VideoContent
+from ..content import JsonVideoContent, VideoContent
 from videos.module.chapters.tests.factories import ChapterFactory
 from videos.module.speakers.tests.factories import SpeakerFactory
 
@@ -78,6 +78,33 @@ def test_render(self):
         self.assertLess(result.index(captions_str), result.index(end_video_str))
 
 
+class TestJsonVideoContent(TestCase):
+    model = DummyPage.content_type_for(JsonVideoContent)
+
+    def test_json(self):
+        """A JsonVideoContent can be rendered to json."""
+        video = factories.VideoFactory.create()
+        sources = factories.SourceFactory.create_batch(2, video=video)
+        content = self.model(video=video)
+
+        def source_json(source):
+            return {
+                'file': source.file.url,
+                'type': source.type,
+            }
+
+        expected = {
+            'sources': [source_json(source) for source in sources],
+            'title': video.title,
+            'slug': video.slug,
+            'preview': video.preview.url,
+            'length': video.length,
+            'recorded': video.recorded,
+            'created': video.created,
+        }
+        self.assertEqual(content.json(), expected)
+
+
 class TestContentAccessible(TestCase):
     def test_object_has_content(self):
         concrete_content_type = DummyPage.content_type_for(VideoContent)