updated admin to make all blog post fields readonly

also made subscription readonly once it is created.

README.txt

@@ -42,6 +42,11 @@ Blogger publishes the feed (I think) using the
 ``<blog_name>.blogspot.com/feeds/posts/default``. This is what you should
 use as the 'topic_url' when creating your subscription.
 
+There is a template tag to provide a template with recent posts that
+required Django>=1.4 because it uses the new assignment tag.
+
 Todo:
-  Change to not use the "blog_id" from settings and instead just use the subscription
-  topic_url.
+  Change management commands to not use the "blog_id" from settings and instead
+  just use the subscription topic_url.
+
+  todo: in the admin, display the blog post content as safe instead of raw html.

blogger/admin.py

@@ -8,10 +8,18 @@
 class PostAdmin(admin.ModelAdmin):
     list_display = ('title', 'author', 'published',)
     list_filter = ('published', 'author',)
+    exclude = ('content_type',)
 
     def has_add_permission(self, request):
         return False
 
+    def get_readonly_fields(self, request, obj=None):
+        # all fields come from feed, so nothing should be editable.
+        return [
+            'slug', 'post_id', 'published',
+            'updated', 'title', 'content',
+            'link_edit', 'link_self', 'link_alternate', 'author'
+        ]
 
 def sync_subscriptions(modeladmin, request, queryset):
     new_posts = 0
@@ -26,6 +34,12 @@ class HubbubSubscriptionAdmin(admin.ModelAdmin):
     readonly_fields = ['verify_token', 'is_verified']
     actions = [sync_subscriptions]
 
+    def get_readonly_fields(self, request, obj=None):
+        # don't allow changes once the model is created.
+        if obj:
+            return ['topic_url', 'host_name'] + self.readonly_fields
+        return self.readonly_fields
+
 
 admin.site.register(BloggerPost, PostAdmin)
 admin.site.register(HubbubSubscription, HubbubSubscriptionAdmin)