New field: Whether or not to include an expandable first post for

embedded content.

app/models/topic.rb

@@ -707,6 +707,14 @@ class Topic < ActiveRecord::Base
     end
   end
 
+  def has_topic_embed?
+    TopicEmbed.where(topic_id: id).exists?
+  end
+
+  def expandable_first_post?
+    SiteSetting.embeddable_host.present? && SiteSetting.embed_truncate? && has_topic_embed?
+  end
+
   private
 
   def update_category_topic_count_by(num)

app/serializers/topic_view_serializer.rb

@@ -37,7 +37,8 @@ class TopicViewSerializer < ApplicationSerializer
              :highest_post_number,
              :last_read_post_number,
              :deleted_by,
-             :actions_summary
+             :actions_summary,
+             :expandable_first_post
 
   # Define a delegator for each attribute of the topic we want
   attributes *topic_attributes
@@ -164,4 +165,12 @@ class TopicViewSerializer < ApplicationSerializer
     result
   end
 
+  def expandable_first_post
+    true
+  end
+
+  def include_expandable_first_post?
+    object.topic.expandable_first_post?
+  end
+
 end

spec/models/topic_embed_spec.rb

@@ -33,6 +33,7 @@ describe TopicEmbed do
         # It converts relative URLs to absolute
         post.cooked.start_with?("hello world new post <a href=\"http://eviltrout.com/hello\">hello</a> <img src=\"http://eviltrout.com/images/wat.jpg\">").should be_true
 
+        post.topic.has_topic_embed?.should be_true
         TopicEmbed.where(topic_id: post.topic_id).should be_present
       end
 

spec/models/topic_spec.rb

@@ -1320,4 +1320,35 @@ describe Topic do
       Topic.calculate_avg_time(1.day.ago)
     end
   end
+
+  describe "expandable_first_post?" do
+    let(:topic) { Fabricate.build(:topic) } 
+
+    before do
+      SiteSetting.stubs(:embeddable_host).returns("http://eviltrout.com")
+      SiteSetting.stubs(:embed_truncate?).returns(true)
+      topic.stubs(:has_topic_embed?).returns(true)
+    end
+
+    it "is true with the correct settings and topic_embed" do
+      topic.expandable_first_post?.should be_true
+    end
+
+    it "is false if embeddable_host is blank" do
+      SiteSetting.stubs(:embeddable_host).returns(nil)
+      topic.expandable_first_post?.should be_false
+    end
+
+    it "is false if embed_truncate? is false" do
+      SiteSetting.stubs(:embed_truncate?).returns(false)
+      topic.expandable_first_post?.should be_false
+    end
+
+    it "is false if has_topic_embed? is false" do
+      topic.stubs(:has_topic_embed?).returns(false)
+      topic.expandable_first_post?.should be_false
+    end
+
+
+  end
 end