Manage and formalize target-file jobs and keep track of source- and target-file includings

app/models/dunlop/source_file_model.rb

@@ -16,6 +16,7 @@ module Dunlop::SourceFileModel
     has_many :downloads, class_name: 'Dunlop::FileDownload', as: :file
     attr_accessor :working_file
     belongs_to :creator, polymorphic: true, optional: true
+    Dunlop.source_file_models << self
 
     mount_uploader :original_file, Dunlop::SourceFileUploader unless defined?(Paperclip) # CarrierWave still default.
 

app/models/dunlop/target_file_model.rb

@@ -14,6 +14,7 @@ module Dunlop::TargetFileModel
     has_many :downloads, class_name: 'Dunlop::FileDownload', as: :file
     attr_accessor :working_file, :original_file
     attr_accessor :resource
+    Dunlop.target_file_models << self
 
     mount_uploader :original_file, Dunlop::TargetFileUploader unless defined?(Paperclip) # CarrierWave still default.
     # used by dunlop-file_transfer

lib/dunlop.rb

@@ -20,4 +20,12 @@ module Dunlop
   def self.has_target_files?
     'TargetFile'.safe_constantize
   end
+
+  def self.source_file_models
+    @source_file_models ||= []
+  end
+
+  def self.target_file_models
+    @target_file_models ||= []
+  end
 end

lib/dunlop/engine.rb

@@ -37,6 +37,8 @@ end
 module Dunlop
   class Engine < ::Rails::Engine
     isolate_namespace Dunlop
+
+    #TODO this generates noise and pollutes API based implementations (Like Panda)
     initializer 'dunlop.action_controller' do |app|
       ActiveSupport.on_load :action_controller do
         helper Dunlop::ApplicationHelper if respond_to?(:helper)
@@ -50,12 +52,28 @@ module Dunlop
     end
 
     # add migrations to containing application
-    initializer :append_migrations do |app|
+    initializer 'dunlop.append_migrations' do |app|
       unless app.root.to_s.match root.to_s
         config.paths["db/migrate"].expanded.each do |expanded_path|
           app.config.paths["db/migrate"] << expanded_path
         end
       end
     end
+
+    config.after_initialize do
+      # Auto generate target-file's ::Job classes having purpose triggering .generate on the class
+      Dunlop.target_file_models.each do |target_file_base_model|
+        ## Generte a job for all target files
+        base_job =  "#{target_file_base_model.name.deconstantize}::ApplicationJob".constantize
+        target_file_base_model.classes.each do |cls|
+          next if cls.const_defined?(:Job)
+          cls::Job = Class.new base_job do
+            def perform
+              self.class.name.sub(/::Job$/, '').constantize.generate!
+            end
+          end
+        end
+      end
+    end
   end
 end