Adding params to error details

rest_framework/exceptions.py

@@ -38,7 +38,8 @@ def _get_error_details(data, default_code=None):
 
     text = force_str(data)
     code = getattr(data, 'code', default_code)
-    return ErrorDetail(text, code)
+    params = getattr(data, 'params', tuple())
+    return ErrorDetail(text, code, params)
 
 
 def _get_codes(detail):
@@ -54,10 +55,16 @@ def _get_full_details(detail):
         return [_get_full_details(item) for item in detail]
     elif isinstance(detail, dict):
         return {key: _get_full_details(value) for key, value in detail.items()}
-    return {
+
+    _base = {
         'message': detail,
         'code': detail.code
     }
+    params = getattr(detail, "params", None)
+
+    if params:
+        _base.update({"params": params})
+    return _base
 
 
 class ErrorDetail(str):
@@ -65,10 +72,12 @@ class ErrorDetail(str):
     A string-like object that can additionally have a code.
     """
     code = None
+    params = None
 
-    def __new__(cls, string, code=None):
+    def __new__(cls, string, code=None, params=None):
         self = super().__new__(cls, string)
         self.code = code
+        self.params = params
         return self
 
     def __eq__(self, other):
@@ -82,11 +91,13 @@ class ErrorDetail(str):
         return not self.__eq__(other)
 
     def __repr__(self):
-        return 'ErrorDetail(string=%r, code=%r)' % (
+        base = 'ErrorDetail(string=%r, code=%r' % (
             str(self),
             self.code,
         )
 
+        return base + ', params=%r)' % self.params if self.params else base + ')'
+
     def __hash__(self):
         return hash(str(self))
 
@@ -105,7 +116,6 @@ class APIException(Exception):
             detail = self.default_detail
         if code is None:
             code = self.default_code
-
         self.detail = _get_error_details(detail, code)
 
     def __str__(self):
@@ -141,6 +151,7 @@ class ValidationError(APIException):
     default_code = 'invalid'
 
     def __init__(self, detail=None, code=None):
+        print(detail, code)
         if detail is None:
             detail = self.default_detail
         if code is None:

rest_framework/fields.py

@@ -236,12 +236,14 @@ def get_error_detail(exc_info):
     except AttributeError:
         return [
             ErrorDetail((error.message % error.params) if error.params else error.message,
-                        code=error.code if error.code else code)
+                        code=error.code if error.code else code,
+                        params=error.params)
             for error in exc_info.error_list]
     return {
         k: [
             ErrorDetail((error.message % error.params) if error.params else error.message,
-                        code=error.code if error.code else code)
+                        code=error.code if error.code else code,
+                        params=error.params)
             for error in errors
         ] for k, errors in error_dict.items()
     }
@@ -599,6 +601,7 @@ class Field:
                     raise
                 errors.extend(exc.detail)
             except DjangoValidationError as exc:
+                print("YOOOOOOOOOO", exc, exc.code, exc.params)
                 errors.extend(get_error_detail(exc))
         if errors:
             raise ValidationError(errors)

tests/test_validation_error.py

@@ -12,17 +12,17 @@ factory = APIRequestFactory()
 
 class ExampleSerializer(serializers.Serializer):
     char = serializers.CharField()
-    integer = serializers.IntegerField()
+    integer = serializers.IntegerField(min_value=1, required=False)
 
 
 class ErrorView(APIView):
     def get(self, request, *args, **kwargs):
-        ExampleSerializer(data={}).is_valid(raise_exception=True)
+        ExampleSerializer(data={"integer": 0}).is_valid(raise_exception=True)
 
 
 @api_view(['GET'])
 def error_view(request):
-    ExampleSerializer(data={}).is_valid(raise_exception=True)
+    ExampleSerializer(data={"integer": 0}).is_valid(raise_exception=True)
 
 
 class TestValidationErrorWithFullDetails(TestCase):
@@ -41,8 +41,13 @@ class TestValidationErrorWithFullDetails(TestCase):
                 'code': 'required',
             }],
             'integer': [{
-                'message': 'This field is required.',
-                'code': 'required'
+                'message': 'Ensure this value is greater than or equal to 1.',
+                'code': 'min_value',
+                'params': {
+                    'limit_value': 1,
+                    'show_value': 0,
+                    'value': 0
+                }
             }],
         }
 
@@ -78,7 +83,7 @@ class TestValidationErrorWithCodes(TestCase):
 
         self.expected_response_data = {
             'char': ['required'],
-            'integer': ['required'],
+            'integer': ['min_value'],
         }
 
     def tearDown(self):