Thank you so much. Code is already written so i need to change the way it 
checks authentication.  That's why I asked about custom handling but as you 
said it is a design problem. I will take your advices and try to refactor 
the code. Thanks for the help. 

12 Haziran 2017 Pazartesi 13:39:46 UTC+3 tarihinde Jani Tiainen yazdı:
>
> Hi,
>
> To me it looks like you're doing wrong solution for your problem.
>
> Serializer is mainly meant to convert data from complex format to python 
> primitives and vice versa.
>
> Validation is to make sure that converted (deserialized) object matches 
> the definition of the serializer.
>
> Now, to me it looks like you want to check is something authenticated. 
> That's not exactly job for serializer,
> but job of your view code (one that calls deserialization) after object 
> has been successfully deserialized and validated.
>
>
> On 12.06.2017 13:30, Sinan Ülker wrote:
>
> Is there any example of custom handling in serializer. I couldn't figure 
> out how to do that. 
>
> On Jun 12, 2017 09:19, "Jani Tiainen" <[email protected] <javascript:>> 
> wrote:
>
>> Hi,
>>
>> You need to raise validation error (or subclass of it). 
>>
>> Another option is to move authentication check outside serializer (which 
>> might be right thing to do)
>> and catch that error properly there (or do custom handling).
>>
>> On 12.06.2017 04:57, Sinan Ülker wrote:
>>
>> Hello,  
>>
>> Since serializer.is_valid()  does not catch the Exceptions other than the 
>> validationError, how can i raise custom exceptions in validate method and 
>> then catch get them with serializer.errors
>>
>> for example:
>>
>> class Foo(serializers.Serializer):
>>     def validate(self, data):
>>         raise exceptions.AuthenticationFailed("message")
>>
>> #### then I want to test it like this but serializer.is_valid() line always 
>> return error. 
>> serializer = Foo(some.data)
>> is_valid = serializer.is_valid()
>> expected_error = {['message.']}
>> self.assertFalse(is_valid)
>> self.assertEqual(serializer.errors, expected_error)
>>
>> I also could not figure out how to handle it with custom exception 
>> handler can you help me about this. I also appreciate if you supply some 
>> examples 
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>> -- 
>> Jani Tiainen
>>
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>
>

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