work on player: integrate vuejs + noscript; remove TemplateMixin for Component and ExposedData; rewrite most of the player; clean up files; do lot of other things

aircox_cms/utils.py

@@ -1,6 +1,13 @@
+import inspect
+
 from django.core.urlresolvers import reverse
+from wagtail.wagtailcore.models import Page
 
 def image_url(image, filter_spec):
+    """
+    Return an url for the given image -- shortcut function for
+    wagtailimages' serve.
+    """
     from wagtail.wagtailimages.views.serve import generate_signature
     signature = generate_signature(image.id, filter_spec)
     url = reverse('wagtailimages_serve', args=(signature, image.id, filter_spec))
@@ -8,12 +15,41 @@ def image_url(image, filter_spec):
     return url
 
 def get_station_settings(station):
+    """
+    Get WebsiteSettings for the given station.
+    """
     import aircox_cms.models as models
     return models.WebsiteSettings.objects \
                  .filter(station = station).first()
 
 def get_station_site(station):
+    """
+    Get the site of the given station.
+    """
     settings = get_station_settings(station)
     return settings and settings.site
 
+def related_pages_filter(reset_cache=False):
+    """
+    Return a dict that can be used to filter foreignkey to pages'
+    subtype declared in aircox_cms.models.
+
+    This value is stored in cache, but it is possible to reset the
+    cache using the `reset_cache` parameter.
+    """
+    import aircox_cms.models as cms
+
+    if not reset_cache and hasattr(related_pages_filter, 'cache'):
+        return related_pages_filter.cache
+    related_pages_filter.cache = {
+        'model__in': list(name.lower() for name, member in
+            inspect.getmembers(cms,
+                lambda x: inspect.isclass(x) and issubclass(x, Page)
+            )
+            if member != Page
+        ),
+    }
+    return related_pages_filter.cache
+
+