Add GCM push for pushing OneMDM app to devices

db/migrate/20151113123015_create_applications.rb

@@ -1,6 +1,6 @@
 class CreateApplications < ActiveRecord::Migration
   def change
-    create_table :applications do |t|
+    create_table :apps do |t|
       t.string :name
       t.string :package_name
 

db/migrate/20151113124226_rename_application_to_app.rb

@@ -1,5 +0,0 @@
-class RenameApplicationToApp < ActiveRecord::Migration
-  def change
-    rename_table :applications, :apps
-  end
-end

db/migrate/20151113131647_create_batch_installations.rb

@@ -1,8 +1,7 @@
 class CreateBatchInstallations < ActiveRecord::Migration
   def change
     create_table :batch_installations do |t|
-      t.integer :app_id
-
+      t.belongs_to :app, foreign_key: true, index: true
       t.timestamps null: false
     end
   end

db/migrate/20151113132152_create_installations.rb

@@ -1,9 +1,9 @@
 class CreateInstallations < ActiveRecord::Migration
   def change
     create_table :installations do |t|
-      t.integer :device_id
-      t.integer :batch_installation_id
-      t.integer :status
+      t.belongs_to :device, foreign_key: true, index: true
+      t.belongs_to :batch_installation, foreign_key: true, index: true
+      t.integer :status, default: 0, null: false
 
       t.timestamps null: false
     end