Override as_json to include more data

app/models/comment.rb

@@ -9,4 +9,19 @@ class Comment < ActiveRecord::Base
 
   attr_accessible :body
 
+  def created
+    created_at.to_s
+  end
+
+  def as_json(options = {})
+    super({
+      :include => {
+        :user => {
+          :only => [ :nickname, :avatar_url ]
+         }
+       },
+       :methods => [:created]
+    }.merge(options))
+  end
+
 end

spec/models/comment_spec.rb

@@ -5,4 +5,30 @@ describe Comment do
   it "factory should be valid" do
     Factory.build(:comment).should be_valid
   end
+
+  describe "#as_json" do
+    let(:user) { Factory(:user) }
+    let(:comment) { Factory.build(:comment) }
+
+    before do
+      comment.user = user
+    end
+
+    it "should include user.gravatar_url" do
+      hash = comment.as_json
+      hash.should include(:user)
+      hash[:user].should include("avatar_url")
+    end
+
+    it "should include user.nickname" do
+      hash = comment.as_json
+      hash.should include(:user)
+      hash[:user].should include("nickname")
+    end
+
+    it "should include comment.created" do
+      comment.as_json.should include :created
+    end
+  end
+
 end