Fix import in a loop (tortoise#472)

mirrorrim · alekseitylindus · web-flow · commit 7e5a384bdb25 · 2020-07-31T07:21:10.000Z
Co-authored-by: Alexey Tylindus &lt;a.tylindus@gmail.com&gt;
diff --git a/CONTRIBUTORS.rst b/CONTRIBUTORS.rst
@@ -34,6 +34,7 @@ Contributors
 * Mykola Solodukha ``@TrDex``
 * Seo Jiyeon ``jiyeonseo``
 * Blake Watters ``blakewatters``
+* Alexey Tylindus ``@mirrorrim``
 
 Special Thanks
 ==============
diff --git a/tortoise/queryset.py b/tortoise/queryset.py
@@ -401,13 +401,13 @@ def annotate(self, **kwargs: Function) -> "QuerySet[MODEL]":
 
         :raises TypeError: Value of kwarg is expected to be a ``Function`` instance.
         """
+        from tortoise.models import get_filters_for_field
+
         queryset = self._clone()
         for key, annotation in kwargs.items():
             if not isinstance(annotation, Function):
                 raise TypeError("value is expected to be Function instance")
             queryset._annotations[key] = annotation
-            from tortoise.models import get_filters_for_field
-
             queryset._custom_filters.update(get_filters_for_field(key, None, key))
         return queryset
 
