add champ_value for dropdown

app/models/logic.rb

@@ -16,6 +16,8 @@ module Logic
     case [left.type, right.type]
     in [a, ^a] # syntax for same type
       true
+    in [:enum, :string]
+      left.options.include?(right.value)
     else
       false
     end

app/models/logic/champ_value.rb

@@ -12,7 +12,7 @@ class Logic::ChampValue < Logic::Term
       champ(champs).true?
     when all_types.fetch(:integer_number), all_types.fetch(:decimal_number)
       champ(champs).for_api
-    when all_types.fetch(:text)
+    when all_types.fetch(:drop_down_list), all_types.fetch(:text)
       champ(champs).value
     end
   end
@@ -28,6 +28,8 @@ class Logic::ChampValue < Logic::Term
       :number
     when all_types.fetch(:text)
       :string
+    when all_types.fetch(:drop_down_list)
+      :enum
     end
   end
 
@@ -54,6 +56,10 @@ class Logic::ChampValue < Logic::Term
     self.class == other.class && @stable_id == other.stable_id
   end
 
+  def options
+    type_de_champ.drop_down_list_enabled_non_empty_options
+  end
+
   private
 
   def type_de_champ