Initial commit

app/controllers/carto/api/presenter_cache.rb

@@ -0,0 +1,45 @@
+module Carto
+  module Api
+    class PresenterCache
+
+      def initialize
+        @cache = Hash.new
+      end
+
+      # Caches to_poro of the presenter that is passed in a block, based on model class and id. Example:
+      # cache.get_poro(user)  { Carto::Api::UserPresenter.new(user, { fetch_groups: false } ) }
+      def get_poro(model)
+        raise "no model given" unless model
+
+        model_class = model.class
+        model_id = model.id
+
+        if model_id.nil?
+          presenter = yield
+          raise "no presenter given" if presenter.nil?
+          return presenter.to_poro
+        end
+
+        class_cache = get_class_cache(model_class)
+
+        unless class_cache[model_id]
+          presenter = yield
+          raise "no presenter given" if presenter.nil?
+          class_cache[model_id] = presenter.to_poro
+        end
+
+        class_cache[model_id]
+      end
+
+      private
+
+      def get_class_cache(model_class)
+        unless @cache[model_class]
+          @cache[model_class] = Hash.new
+        end
+        @cache[model_class]
+      end
+
+    end
+  end
+end