Extension for Django REST framework error display
This package extends default error JSON body providing configurable error codes and more consumable response structure.
It turns default JSON body of HTTP 400 response, which look like this
{
"name": ["This field is required."],
"password": ["This field may not be blank."]
}
into
{
"errors": {
"name": [
{
"message": "This field is required."
"code": "required"
}
],
"password": [
{
"message": "This field may not be blank."
"code": "blank"
}
]
}
}
Library handles all Django REST framework built-in serializer validation.
- Python (2.7, 3.5, 3.6)
- Django (1.10+, 1.11+)
- Django REST framework (>=3.3)
By running installation script
$ python setup.py install
Or using pip
$ pip install drf-friendly-errors
Simply add a FriendlyErrorMessagesMixin to your serializer or model serializer class
from rest_framework_friendly_errors.mixins import FriendlyErrorMessagesMixin
class MySerializer(FriendlyErrorMessagesMixin, ModelSerializer):
If you want to change default library settings and provide your own set of error codes just add following in your settings.py
FRIENDLY_ERRORS = {
FIELD_ERRORS = {
'CharField': {'required': 'my_custom_error_code', 'null': 'my_custom_error_code'}
}
VALIDATOR_ERRORS = {
'UniqueValidator': 'my_custom_error_code'
},
EXCEPTION_DICT = {
'PermissionDenied': 'my_custom_error_code'
}
}
If you need custom field validation or validation for whole serializer register your validation in serializer class
class PostSerializer(FriendlyErrorMessagesMixin,
serializers.ModelSerializer):
class Meta:
model = Post
def validate_title(self, value):
if value[0] != value[0].upper():
raise ValidationError('First letter must be an uppercase')
return value
def validate(self, attrs):
category = attrs.get('category)
title = attrs.get('title')
if category and category not in title:
raise ValidationError('Title has to include category')
return attrs
FIELD_VALIDATION_ERRORS = {'validate_title': 'invalid_title'} # register your own validation method and assign it to error code
NON_FIELD_ERRORS = {'Title has to include category': 'no_category'} # register non field error messages and assign it to error code
If you want to raise field error in validate method use register_error method provided by a mixin
class PostSerializer(FriendlyErrorMessagesMixin,
serializers.ModelSerializer):
class Meta:
model = Post
def validate(self, attrs):
category = attrs.get('category')
title = attrs.get('title')
if category and category not in title:
self.register_error(error_message='Title has to include category',
error_code='no_category',
field_name='title')
return attrs
To turn other type of errors responses into friendly errors responses with error codes add this exception handler to your REST_FRAMEWORK settings
REST_FRAMEWORK = {
'EXCEPTION_HANDLER':
'rest_framework_friendly_errors.handlers.friendly_exception_handler'
}
Make sure your tests are passing for pull request. You can run the test suite with:
python runtests.py
- Geoffrey Lehée <socketubs>
- Aamir Rind <intellisense>