Add GCM push for pushing OneMDM app to devices

app/models/installation.rb

@@ -1,9 +1,28 @@
 class Installation < ActiveRecord::Base
   enum status: [:pushed, :downloaded, :cancelled, :installed]
-
-
+  delegate :app, to: :batch_installation
 
   belongs_to :device
   belongs_to :batch_installation
 
+  after_create :push_apps
+  
+  def as_json(options={})
+    {
+      :id => self.id,
+      :name => self.app.name,
+      :package_name => self.app.package_name,
+      :apk_url => self.app.apk_url
+    }
+  end
+
+  def push_apps
+    if self.pushed?
+      gcm = GCM.new(GCM_KEY)
+      registration_ids = [self.device.gcm_token]
+      options = { data: {message: self.to_json }}
+      response = gcm.send(registration_ids, options)
+      logger.debug "response #{response}"
+    end
+  end
 end