Memoize color scheme finds in concern

Author: rossta

app/controllers/concerns/color_scheming.rb

@@ -17,16 +17,16 @@ def custom_color_scheme?
   end
 
   def find_color_scheme
-    preview_color_scheme || session_color_scheme || default_color_scheme
+    @color_scheme ||= preview_color_scheme || session_color_scheme || default_color_scheme
   end
 
   def preview_color_scheme_id = params.dig(:settings, :color_scheme_id)
 
-  def preview_color_scheme = preview_color_scheme_id && ColorScheme.find(preview_color_scheme_id)
-
   def session_color_scheme_id = session[:color_scheme_id]
 
-  def session_color_scheme = session_color_scheme_id && ColorScheme.find(session_color_scheme_id)
+  def preview_color_scheme = @preview_color_scheme ||= preview_color_scheme_id && ColorScheme.find(preview_color_scheme_id)
+
+  def session_color_scheme = @session_color_scheme ||= session_color_scheme_id && ColorScheme.find(session_color_scheme_id)
 
   def default_color_scheme = @default_color_scheme ||= ColorScheme.cached_default
 end