Uniweb články

shared/models.py

@@ -25,7 +25,11 @@ class SubpageMixin:
 
 
 class ArticleMixin(models.Model):
-    """Common fields for articles"""
+    """
+    Common fields for articles
+
+    If you want to tag articles, add tags as `tags` field in article page model.
+    """
 
     RICH_TEXT_FEATURES = [
         "h2",
@@ -66,6 +70,18 @@ class ArticleMixin(models.Model):
     class Meta:
         abstract = True
 
+    @classmethod
+    def has_tags(cls):
+        try:
+            cls._meta.get_field("tags")
+        except models.FieldDoesNotExist:
+            return False
+        return True
+
+    def tag_filter_page(self):
+        """Page used for filtering by tags in url like `?tag=foo`."""
+        return self.get_parent()
+
 
 class Person(models.Model):
     """Informace o Piratovi. Slouzi prevazne jako cache informaci o osobe pro