Introduces Redmine::Plugin#attachment_object_type to provide better API for registering plugin models having attachments (#39948, #39862).

Patch by Jens Krämer (@jkraemer).

git-svn-id: https://svn.redmine.org/redmine/trunk@22747 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/plugin.rb

       Redmine::WikiFormatting.register(name, *args)
     end
 
+    # Register plugin models that use acts_as_attachable.
+    #
+    # Example:
+    #   attachment_object_type SomeAttachableModel
+    #
+    # This is necessary for the core attachments controller routes and attachments/_form to work.
+    def attachment_object_type(*args)
+      args.each do |klass|
+        Redmine::Acts::Attachable::ObjectTypeConstraint.register_object_type(klass.name.underscore.pluralize)
+      end
+    end
+
     # Returns +true+ if the plugin can be configured.
     def configurable?
       settings && settings.is_a?(Hash) && settings[:partial].present?

test/unit/lib/redmine/plugin_test.rb

     assert_equal File.join(@klass.directory, 'foo_plugin', 'assets'), plugin.assets_directory
   end
 
+  ::FooModel = Class.new(ActiveRecord::Base)
+  def test_register_attachment_object_type
+    Redmine::Acts::Attachable::ObjectTypeConstraint.expects(:register_object_type).with("foo_models")
+    @klass.register :foo_plugin do
+      attachment_object_type FooModel
+    end
+  end
+
   def test_register_should_raise_error_if_plugin_directory_does_not_exist
     e = assert_raises Redmine::PluginNotFound do
       @klass.register(:bar_plugin) {}