          return self.choices
  
      def iter_options(self):
          return iter_options(
              self.grouped_choices,
              cutoff=self.html_cutoff,
              cutoff_text=self.html_cutoff_text
          )
  
      def display_value(self, instance):
 
</s> remove             self.grouped_choices,
 </s> add             self.get_choices(cutoff=self.html_cutoff), </s> remove         return self.child_relation.choices
 </s> add         return self.get_choices() </s> remove     @property
    def choices(self):
 </s> add     def get_choices(self, cutoff=None):
            self.get_choices(cutoff=self.html_cutoff),
          return self.choices
  
      def iter_options(self):
          return iter_options(
            self.get_choices(cutoff=self.html_cutoff),
              cutoff=self.html_cutoff,
              cutoff_text=self.html_cutoff_text
          )
  
      def display_value(self, instance):
keep keep keep keep replace keep keep keep keep keep
 Limit queryset when rendering relational choices. (#4375)

Limit querysets to html_cutoff when rendering relational choices 
rest_framework/relations.py