FEATURE: include post image in OpenGraph image tag

app/models/post.rb

@@ -719,6 +719,7 @@ end
 #  raw_email               :text
 #  public_version          :integer          default(1), not null
 #  action_code             :string
+#  image_url               :string
 #
 # Indexes
 #

db/migrate/20161029181306_add_image_url_to_posts.rb

@@ -0,0 +1,5 @@
+class AddImageUrlToPosts < ActiveRecord::Migration
+  def change
+    add_column :posts, :image_url, :string
+  end
+end

lib/cooked_post_processor.rb

@@ -84,7 +84,7 @@ class CookedPostProcessor
       convert_to_link!(img)
     end
 
-    update_topic_image
+    update_post_image
   end
 
   def extract_images
@@ -100,7 +100,7 @@ class CookedPostProcessor
     @doc.css(".quote img")
   end
 
-  def extract_images_for_topic
+  def extract_images_for_post
     # all image with a src attribute
     @doc.css("img[src]") -
     # minus, emojis
@@ -285,10 +285,11 @@ class CookedPostProcessor
     span
   end
 
-  def update_topic_image
-    if @post.is_first_post?
-      img = extract_images_for_topic.first
-      @post.topic.update_column(:image_url, img["src"][0...255]) if img["src"].present?
+  def update_post_image
+    img = extract_images_for_post.first
+    if img["src"].present?
+      @post.update_column(:image_url, img["src"][0...255]) # post
+      @post.topic.update_column(:image_url, img["src"][0...255]) if @post.is_first_post? # topic
     end
   end
 

lib/topic_view.rb

@@ -180,8 +180,12 @@ class TopicView
 
   def image_url
     if @post_number.present? && @post_number.to_i != 1 && @desired_post.present?
-      # show poster avatar
-      @desired_post.user.avatar_template_url.gsub("{size}", "100") if @desired_post.user
+      if @desired_post.image_url.present?
+        @desired_post.image_url
+      elsif @desired_post.user
+        # show poster avatar
+        @desired_post.user.avatar_template_url.gsub("{size}", "100")
+      end
     else
       @topic.image_url
     end

spec/components/cooked_post_processor_spec.rb

@@ -242,19 +242,30 @@ describe CookedPostProcessor do
     end
 
     context "topic image" do
-
       let(:topic) { build(:topic, id: 1) }
       let(:post) { Fabricate(:post_with_uploaded_image, topic: topic) }
       let(:cpp) { CookedPostProcessor.new(post) }
 
-      it "adds a topic image if there's one in the post" do
+      it "adds a topic image if there's one in the first post" do
         FastImage.stubs(:size)
         expect(post.topic.image_url).to eq(nil)
         cpp.post_process_images
         post.topic.reload
         expect(post.topic.image_url).to be_present
       end
+    end
 
+    context "post image" do
+      let(:reply) { Fabricate(:post_with_uploaded_image, post_number: 2) }
+      let(:cpp) { CookedPostProcessor.new(reply) }
+
+      it "adds a post image if there's one in the post" do
+        FastImage.stubs(:size)
+        expect(reply.image_url).to eq(nil)
+        cpp.post_process_images
+        reply.reload
+        expect(reply.image_url).to be_present
+      end
     end
 
   end