Add in_favorites into models

apps/recipe/models.py

@@ -13,6 +13,20 @@ class RecipeQuerySet(models.QuerySet):
         return self.filter(state__in=[self.model.PUBLISHED,
                                       self.model.PUBLISHED_EXCLUSIVE])
 
+    def annotate_in_favorites(self, user):
+        """Annotate flag in_favorites"""
+        favorite_establishments = []
+        if user.is_authenticated:
+            favorite_establishments = user.favorites.by_content_type(app_label='recipe',
+                                                                     model='recipe') \
+                .values_list('object_id', flat=True)
+        return self.annotate(in_favorites=models.Case(
+            models.When(
+                id__in=favorite_establishments,
+                then=True),
+            default=False,
+            output_field=models.BooleanField(default=False)))
+
 
 class Recipe(TranslatedFieldsMixin, ImageMixin, BaseAttributes):
     """Recipe model."""