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-rw-r--r--rest_framework/utils/field_mapping.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/rest_framework/utils/field_mapping.py b/rest_framework/utils/field_mapping.py
index 30fae370..fd6da699 100644
--- a/rest_framework/utils/field_mapping.py
+++ b/rest_framework/utils/field_mapping.py
@@ -219,6 +219,9 @@ def get_relation_kwargs(field_name, relation_info):
kwargs['required'] = False
if model_field.null:
kwargs['allow_null'] = True
+ if getattr(model_field, 'unique', False):
+ validator = UniqueValidator(queryset=model_field.model._default_manager)
+ kwargs['validators'] = [validator]
return kwargs