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Fix #3844, refine validator for fields with <source=> kwargs #3845

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Fix #3844, refine validator for fields with <source=> kwargs #3845

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6 changes: 3 additions & 3 deletions rest_framework/validators.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,7 @@ def set_context(self, serializer_field):
"""
# Determine the underlying model field name. This may not be the
# same as the serializer field name if `source=<>` is set.
self.field_name = serializer_field.source_attrs[0]
self.field_name = serializer_field.source_attrs[-1]
# Determine the existing instance, if this is an update operation.
self.instance = getattr(serializer_field.parent, 'instance', None)

Expand Down Expand Up @@ -174,8 +174,8 @@ def set_context(self, serializer):
"""
# Determine the underlying model field names. These may not be the
# same as the serializer field names if `source=<>` is set.
self.field_name = serializer.fields[self.field].source_attrs[0]
self.date_field_name = serializer.fields[self.date_field].source_attrs[0]
self.field_name = serializer.fields[self.field].source_attrs[-1]
self.date_field_name = serializer.fields[self.date_field].source_attrs[-1]
# Determine the existing instance, if this is an update operation.
self.instance = getattr(serializer, 'instance', None)

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