Added comments

db/migrate/20160708042302_create_comments.rb

@@ -0,0 +1,11 @@
+class CreateComments < ActiveRecord::Migration
+  def change
+    create_table :comments do |t|
+      t.string :model_type
+      t.integer :model_id
+      t.text :comment
+
+      t.timestamps null: false
+    end
+  end
+end

db/migrate/20160708042511_add_user_id_to_comments.rb

@@ -0,0 +1,5 @@
+class AddUserIdToComments < ActiveRecord::Migration
+  def change
+    add_column :comments, :user_id, :integer
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160707034050) do
+ActiveRecord::Schema.define(version: 20160708042511) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -24,6 +24,15 @@ ActiveRecord::Schema.define(version: 20160707034050) do
     t.datetime "updated_at"
   end
 
+  create_table "comments", force: :cascade do |t|
+    t.string   "model_type"
+    t.integer  "model_id"
+    t.text     "comment"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.integer  "user_id"
+  end
+
   create_table "conference_admins", force: :cascade do |t|
     t.integer  "conference_id"
     t.integer  "user_id"