Merge pull request #164 from Navdevl/fix-unneeded-migration-creation

Handling the unneeded migration filecreation using method_added capture approach

Author: grzegorz-jakubiak

lib/activeadmin-mongoid.rb

@@ -1 +1,29 @@
 require 'active_admin/mongoid'
+require "rails/generators/actions"
+require "rails/generators/named_base"
+
+# Considering the Rails::Generators::NamedBase is one of the nearest ancestor to
+# ActiveAdmin::Generators::InstallGenerator, we can open the class and an empty create_migration
+# to the class(which will overridden by other subclasses). We can specifically focus on the
+# ActiveAdmin::Generators::InstallGenerator class and apply remove_method during the method_added call
+# and thereby pushing ActiveAdmin::Generators::InstallGenerator to use our empty create_migrations method.
+
+Rails::Generators::NamedBase.class_eval do
+
+  def create_migrations
+  end
+
+  def self.inherited(klass)
+    super
+    if klass.name == "ActiveAdmin::Generators::InstallGenerator"
+
+      klass.class_eval do 
+        def self.method_added(method_name)
+          super
+          remove_method method_name if method_name == :create_migrations
+        end
+      end
+    end
+  end
+end
+