lib/quby/compiler/services/definition_validator.rb in quby-compiler-0.2.1 vs lib/quby/compiler/services/definition_validator.rb in quby-compiler-0.3.1

@@ -129,12 +129,12 @@
 
           fail ArgumentError, "Flag '#{key}' has unknown hides_questions keys #{unknown_questions}"
         end
 
         def validate_flag_depends_on(questionnaire, flag)
-          return if flag.depends_on.blank? || questionnaire.flags.key?(flag.depends_on)
+          return if (missing = flag.depends_on - questionnaire.flags.keys).blank?
 
-          fail ArgumentError, "Flag #{flag.key} depends_on nonexistent flag '#{flag.depends_on}'"
+          fail ArgumentError, "Flag #{flag.key} depends_on nonexistent flag '#{missing.to_sentence}'"
         end
 
         def validate_respondent_types(questionnaire)
           valid_respondent_types = Entities::Questionnaire::RESPONDENT_TYPES