Django rest api issue: hasattr(): attribute name must be string

Question

I'm creating a simple blog application and I am trying to convert django rest api. But, I got this error

TypeError at /user/api/ hasattr(): attribute name must be string

Exception Type: TypeError at /user/api/

Exception Value: hasattr(): attribute name must be string

this is my models.py file

from django.conf import settings
from django.db import models
from django.urls import reverse

class BlogPost(models.Model):
    author = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE)
    blog_title=models.CharField(max_length=200)
    blog_description=models.TextField()
    blog_pub=models.DateTimeField(auto_now_add=True)
    blog_update=models.DateTimeField(auto_now=True)


    def __str__(self):
        return self.blog_title


    def get_absolute_url(self):

        return reverse('blog:blog_post', kwargs={'pk': self.pk})

this is my serializers.py file

from rest_framework import serializers

from blog.models import BlogPost


class BlogPostSerializer(serializers.ModelSerializer):

    class Meta:
        fields=(
            'author',
            'blog_title',
            'blog_description',
        ),
        model=BlogPost

This is views.py file

from blog.models import BlogPost

from .serializers import BlogPostSerializer
from rest_framework import generics
from . import serializers
from . import serializers


class BlogPostListAPI(generics.ListCreateAPIView):
    queryset=BlogPost.objects.all()
    serializer_class=BlogPostSerializer


class BlogPostListAPIDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset = BlogPost.objects.all()
    serializer_class = serializers.BlogPostSerializer

this is urls.py file

from django.urls import path,include

from .views import SignUpForm, UserProfiles
from .api.views import *


urlpatterns = [
    path('signup/',  SignUpForm.as_view(), name='signup'),
    path('profile/', UserProfiles.as_view(), name='profile'),
    path('api/', BlogPostListAPI.as_view(), name='asad'),
    path('api/<int:pk>', BlogPostListAPIDetail.as_view()),
]

this is screenshot

All code shared. but I don't know how can I get this error. Also, I didn't use hasttr. — Asaduzzaman Sohel
– Asaduzzaman Sohel, Commented Apr 21, 2018 at 8:34
click the switch to copy and paste view and paste in that error in the updated error. should likely list then where it crashed. — Samuel Muiruri
– Samuel Muiruri, Commented Apr 21, 2018 at 8:36
Remove Comma ',' just before model in the BlogPostSerializer — MaNKuR
– MaNKuR, Commented Apr 21, 2018 at 8:43

Ralf · Accepted Answer · 2018-04-21 12:22:35Z

4

As @MaNKuR pointed out in a comment to the question, you have an additional comma in your serializer definition at the end of Meta.fields:

class BlogPostSerializer(serializers.ModelSerializer):

    class Meta:
        fields=(
            'author',
            'blog_title',
            'blog_description',
        ),

Because of this, Meta.fields is now a "tuple of tuple of strings" instead of just a "tuple of strings".

When iterating over fields, instead of the expected three string elements

1. 'author'
2. 'blog_title'
3. 'blog_description'

you get only one element that is not a string

1. ('author', 'blog_title', 'blog_description')

Hence, the internal code of the Serializer complains that it did not get a string like it is supposed to get.

answered Apr 21, 2018 at 12:22

Ralf

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