Fix regressions from #6998

* fixed old reshares of reshares
* fixed deleted root of a reshare

app/presenters/post_presenter.rb

@@ -138,9 +138,8 @@ class PostPresenter < BasePresenter
   end
 
   def tags
-    tags = @post.is_a?(Reshare) ? @post.root.tags : @post.tags
-    return tags.map(&:name) if tags
-    []
+    tags = @post.is_a?(Reshare) ? @post.absolute_root.try(:tags) : @post.tags
+    tags ? tags.map(&:name) : []
   end
 
   def comma_separated_tags
@@ -152,6 +151,6 @@ class PostPresenter < BasePresenter
   end
 
   def description
-    message.plain_text_without_markdown(truncate:  1000)
+    message.try(:plain_text_without_markdown, truncate: 1000)
   end
 end

spec/presenters/post_presenter_spec.rb

@@ -89,4 +89,48 @@ describe PostPresenter do
       expect(presenter.as_json).to be_a(Hash)
     end
   end
+
+  describe "#tags" do
+    it "returns the tag of the post" do
+      post = FactoryGirl.create(:status_message, text: "#hello #world", public: true)
+
+      expect(PostPresenter.new(post).send(:tags)).to match_array(%w(hello world))
+    end
+
+    it "returns the tag of the absolute_root of a Reshare" do
+      post = FactoryGirl.create(:status_message, text: "#hello #world", public: true)
+      first_reshare = FactoryGirl.create(:reshare, root: post)
+      second_reshare = FactoryGirl.create(:reshare, root: first_reshare)
+
+      expect(PostPresenter.new(second_reshare).send(:tags)).to match_array(%w(hello world))
+    end
+
+    it "does not raise if the root of a reshare does not exist anymore" do
+      reshare = FactoryGirl.create(:reshare)
+      reshare.root = nil
+
+      expect(PostPresenter.new(reshare).send(:tags)).to eq([])
+    end
+  end
+
+  describe "#description" do
+    it "returns the first 1000 chars of the text" do
+      post = FactoryGirl.create(:status_message, text: "a" * 1001, public: true)
+
+      expect(PostPresenter.new(post).send(:description)).to eq("#{'a' * 997}...")
+    end
+
+    it "does not change the message if less or equal 1000 chars" do
+      post = FactoryGirl.create(:status_message, text: "a" * 1000, public: true)
+
+      expect(PostPresenter.new(post).send(:description)).to eq("a" * 1000)
+    end
+
+    it "does not raise if the root of a reshare does not exist anymore" do
+      reshare = FactoryGirl.create(:reshare)
+      reshare.root = nil
+
+      expect(PostPresenter.new(reshare).send(:description)).to eq(nil)
+    end
+  end
 end