Django Rest Framework custom error messages

Question

I am trying to add custom field error messages for SlugRelated field as follows:

class Test(serializers.ModelSerializers):
    team = serializers.SlugRelatedField(queryset=Team.objects.all(), slug_field='name',
                                        error_messages={"does_not_exist": "Team not found"})

Works as expected. My query is how do I pass the team name dynamically in the error message. I tried the following but it did not work:

class Test(serializers.ModelSerializers):
    team = serializers.SlugRelatedField(queryset=Team.objects.all(), slug_field='name',
                                        error_messages={"does_not_exist": f"Team {team} not found"})

Sachin · Accepted Answer · 2018-11-23 10:35:06Z

1

The default error message for does_not_exist take slug_name & value as the keyword argument to format the error string.

Solution is to replace team with value.

Solution:

class Test(serializers.ModelSerializers):
    team = serializers.SlugRelatedField(
        queryset=Team.objects.all(),
        slug_field='name',
        error_messages={"does_not_exist": "Team {value} not found"}
    )

Ref: relations:SlugRelatedField Source Code

edited Nov 23, 2018 at 10:35

answered Nov 23, 2018 at 8:26

Sachin

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1 Comment

Sachin Over a year ago

Right. Forgot to convert it back to regular string from f-string. Updating the answer.

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