Migrate comment table

db/migrate/20141119131607_create_comments.rb

@@ -0,0 +1,14 @@
+class CreateComments < ActiveRecord::Migration
+  def change
+    create_table :comments do |t|
+      t.references :user, index: true
+      t.references :file, index: true
+      t.string :user_type
+      t.integer :row
+      t.integer :column
+      t.string :text
+
+      t.timestamps
+    end
+  end
+end