add user_id to comments

db/migrate/20161228062119_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

@@ -11,13 +11,14 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20161228052102) do
+ActiveRecord::Schema.define(version: 20161228062119) do
 
   create_table "comments", force: :cascade do |t|
     t.text     "content"
     t.integer  "mission_id"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.integer  "user_id"
   end
 
   add_index "comments", ["mission_id"], name: "index_comments_on_mission_id"