Froegin keys

app/models/device_job.rb

@@ -1,2 +1,7 @@
 class DeviceJob < ApplicationRecord
-end
+    # self.primary_key = :jobs_id, :device_id
+    belongs_to :job
+    belongs_to :device
+    # :foreign_key => [:user_id, :group_id]
+
+end

app/models/job.rb

@@ -1,2 +1,4 @@
 class Job < ApplicationRecord
+
+    has_many :device_jobs
 end