Get rid of roles

lib/static_model.rb

@@ -0,0 +1,47 @@
+# Provides an ActiveRecord-like interface to a model whose data is not persisted to a database.
+module StaticModel
+  extend ActiveSupport::Concern
+
+  module ClassMethods
+    # Used by ActiveRecord's polymorphic association to set object_id
+    def primary_key
+      'id'
+    end
+
+    # Used by ActiveRecord's polymorphic association to set object_type
+    def base_class
+      self
+    end
+  end
+
+  # Used by AR for fetching attributes
+  #
+  # Pass it along if we respond to it.
+  def [](key)
+    send(key) if respond_to?(key)
+  end
+
+  def to_param
+    id
+  end
+
+  def new_record?
+    false
+  end
+
+  def persisted?
+    false
+  end
+
+  def destroyed?
+    false
+  end
+
+  def ==(other)
+    if other.is_a? StaticModel
+      id == other.id
+    else
+      super
+    end
+  end
+end