[#1421] Move type specific to_s implementations to typed champs

app/models/champ.rb

@@ -67,14 +67,7 @@ class Champ < ApplicationRecord
 
   def to_s
     if value.present?
-      case type_champ
-      when 'date'
-        Date.parse(value).strftime('%d/%m/%Y')
-      when 'multiple_drop_down_list'
-        drop_down_list.selected_options_without_decorator(self).join(', ')
-      else
-        value.to_s
-      end
+      string_value
     else
       ''
     end
@@ -118,4 +111,10 @@ class Champ < ApplicationRecord
 
     errors
   end
+
+  private
+
+  def string_value
+    value.to_s
+  end
 end

app/models/champs/date_champ.rb

@@ -11,4 +11,8 @@ class Champs::DateChamp < Champ
         nil
       end
   end
+
+  def string_value
+    Date.parse(value).strftime('%d/%m/%Y')
+  end
 end

app/models/champs/multiple_drop_down_list_champ.rb

@@ -14,4 +14,8 @@ class Champs::MultipleDropDownListChamp < Champ
       end
     end
   end
+
+  def string_value
+    drop_down_list.selected_options_without_decorator(self).join(', ')
+  end
 end