Simplify conditions to pick up a color

app/models/card.rb

@@ -1,5 +1,5 @@
 class Card < ApplicationRecord
-  include Assignable, Boostable, Commentable, Engageable, Eventable,
+  include Assignable, Boostable, Colored, Commentable, Engageable, Eventable,
     Messages, Notifiable, Pinnable, Closeable, Scorable, Searchable, Staged, Statuses, Taggable, Watchable
 
   belongs_to :collection, touch: true
@@ -33,14 +33,6 @@ class Card < ApplicationRecord
     [ super, collection&.name ].compact.join("/")
   end
 
-  def color
-    return Colorable::DEFAULT_COLOR unless collection&.workflow.present?
-    return Colorable::DEFAULT_COLOR unless doing?
-    return Colorable::DEFAULT_COLOR unless stage.present?
-
-    stage.color.presence || Colorable::DEFAULT_COLOR
-  end
-
   private
     def track_due_date_change
       if due_on.present?

app/models/card/colored.rb

@@ -0,0 +1,12 @@
+module Card::Colored
+  extend ActiveSupport::Concern
+
+  def color
+    color_from_stage || Colorable::DEFAULT_COLOR
+  end
+
+  private
+    def color_from_stage
+      stage&.color&.presence if doing?
+    end
+end