ComplianceControlDecorator: Convert to new action links interface

* Decorate the `ComplianceControl` so we can show the action links from
  the decorator in the header.
* Add a `decorates` to get `object_class` to work inside the decorator.
* Define `AF83::Decorator.define_instance_class_method` in order to
  enable the `@compliance_control.class.METHOD` calls in the view to
  work. Thanks very much to Johan for figuring out a way to do that.

Refs #5586

3 files changed, 26 insertions, 0 deletions

diff --git a/app/controllers/compliance_controls_controller.rb b/app/controllers/compliance_controls_controller.rb
index dfbecaa71..73dc18f59 100644
--- a/app/controllers/compliance_controls_controller.rb
+++ b/app/controllers/compliance_controls_controller.rb
@@ -8,6 +8,12 @@ class ComplianceControlsController < ChouetteController
     @sti_subclasses = ComplianceControl.subclasses
   end
 
+  def show
+    show! do
+      @compliance_control = @compliance_control.decorate
+    end
+  end
+
   def new
     if params[:sti_class].blank?
       flash[:notice] = I18n.t("compliance_controls.errors.mandatory_control_type")
diff --git a/app/decorators/compliance_control_decorator.rb b/app/decorators/compliance_control_decorator.rb
index a0445faa2..c57a7ccc7 100644
--- a/app/decorators/compliance_control_decorator.rb
+++ b/app/decorators/compliance_control_decorator.rb
@@ -1,4 +1,6 @@
 class ComplianceControlDecorator < AF83::Decorator
+  decorates ComplianceControl
+
   with_instance_decorator do |instance_decorator|
     instance_decorator.show_action_link do |l|
       l.content h.t('compliance_control_sets.actions.show')
@@ -30,4 +32,16 @@ class ComplianceControlDecorator < AF83::Decorator
       l.data confirm: h.t('compliance_controls.actions.destroy_confirm')
     end
   end
+
+  define_instance_class_method :predicate do
+    object_class.predicate
+  end
+
+  define_instance_class_method :prerequisite do
+    object_class.prerequisite
+  end
+
+  define_instance_class_method :dynamic_attributes do
+    object_class.dynamic_attributes
+  end
 end
diff --git a/lib/af83/decorator.rb b/lib/af83/decorator.rb
index 1b9574053..f990555fe 100644
--- a/lib/af83/decorator.rb
+++ b/lib/af83/decorator.rb
@@ -32,6 +32,12 @@ class AF83::Decorator < ModelDecorator
     instance_decorator.send(:define_method, method_name, &block)
   end
 
+  # Defines a class method on the decorated object's class. These
+  # can be called like `object.class.my_method`.
+  def self.define_instance_class_method method_name, &block
+    instance_decorator.send(:define_singleton_method, method_name, &block)
+  end
+
   class ActionLinks
     attr_reader :options