Add page layouts repository class option

This allows to register your own Alchemy::PageLayout repository class.

app/models/alchemy/page/page_layouts.rb

@@ -8,6 +8,14 @@ module PageLayouts
       extend ActiveSupport::Concern
 
       module ClassMethods
+        # Register a custom page layouts repository
+        #
+        # The default repository is Alchemy::PageLayout
+        #
+        def layouts_repository=(klass)
+          @_layouts_repository = klass
+        end
+
         # Returns page layouts ready for Rails' select form helper.
         #
         def layouts_for_select(language_id, only_layoutpages = false)
@@ -40,7 +48,7 @@ def layouts_with_own_for_select(page_layout_name, language_id, only_layoutpages
         #
         def selectable_layouts(language_id, only_layoutpages = false)
           @language_id = language_id
-          Alchemy::PageLayout.all.select do |layout|
+          layouts_repository.all.select do |layout|
             if only_layoutpages
               layout["layoutpage"] && layout_available?(layout)
             else
@@ -67,6 +75,10 @@ def human_layout_name(layout)
 
         private
 
+        def layouts_repository
+          @_layouts_repository ||= PageLayout
+        end
+
         # Maps given layouts for Rails select form helper.
         #
         def mapped_layouts_for_select(layouts)

spec/models/alchemy/page_spec.rb

@@ -225,6 +225,16 @@ module Alchemy
 
     # ClassMethods (a-z)
 
+    describe ".layouts_repository=" do
+      let(:dummy_repo) { Class.new }
+
+      it "should be able to set another repository class" do
+        expect(Alchemy::Page.layouts_repository = dummy_repo).to eq(dummy_repo)
+      end
+
+      after { Alchemy::Page.instance_variable_set(:@_layouts_repository, nil) }
+    end
+
     describe ".url_path_class" do
       subject { described_class.url_path_class }