adjusted API to match frontend

app/models/joule_module.rb

@@ -2,8 +2,14 @@ class JouleModule < ApplicationRecord
   belongs_to :nilm
   has_many :joule_pipes, dependent: :destroy
 
-  def self.json_keys
+  # attributes accepted from the Joule json response
+  def self.joule_keys
     [:name, :description, :web_interface, :exec_cmd,
      :status, :pid]
   end
+  # attributes sent to the client
+  def self.json_keys
+    [:id, :name, :description, :web_interface, :exec_cmd,
+     :status, :pid]
+  end
 end

app/services/joule_modules/update_joule_modules.rb

@@ -28,7 +28,7 @@ class UpdateJouleModules
   def _build_module(info)
     # create JouleModule and associated pipes from
     # hash returned by the JouleAdapter.module_info
-    params = info.extract!(*JouleModule.json_keys)
+    params = info.extract!(*JouleModule.joule_keys)
     m = JouleModule.new(params)
     # link inputs to database streams
     info[:input_paths].each do |name, path|

app/views/joule_modules/show.json.jbuilder

@@ -2,6 +2,7 @@ json.data do
   json.array! @joule_modules do |m|
     json.extract! m, *JouleModule.json_keys
     json.url @url_template % [m.id]
+    json.nilm_id @nilm.id
   end
 end