Merge branch 'feature/filter-favs-by-tag' into 'develop'

Filters for news favorites

See merge request gm/gm-backend!133

apps/news/filters.py

@@ -16,6 +16,8 @@ class NewsListFilterSet(filters.FilterSet):
         ),
         method='by_tag_group'
     )
+    tag_value__exclude = filters.CharFilter(method='exclude_tags')
+    tag_value__in = filters.CharFilter(method='in_tags')
 
     class Meta:
         """Meta class"""
@@ -24,8 +26,18 @@ class NewsListFilterSet(filters.FilterSet):
             'title',
             'is_highlighted',
             'tag_group',
+            'tag_value__exclude',
+            'tag_value__in',
         )
 
+    def in_tags(self, queryset, name, value):
+        tags = value.split('__')
+        return queryset.filter(tags__value__in=tags)
+
+    def exclude_tags(self, queryset, name, value):
+        tags = value.split('__')
+        return queryset.exclude(tags__value__in=tags)
+
     def by_tag_group(self, queryset, name, value):
         if value == models.News.RECIPES_TAG_VALUE:
             queryset = queryset.recipe_news()