[FIXED] Django extract string from [ErrorDetail(string='Test Message', code='invalid')]

Issue

I would like to show in my template only message that is in string variable, but I don't know how. I am using Django Rest Framework. My code:

form.html

<p>{{ serializer.amount.errors }}</p>

serializers.py

from rest_framework import serializers
from .models import Data, Material


class DataSerializer(serializers.ModelSerializer):

class Meta:
    model = Data
    fields = ('order_date', 'material', 'amount', 'delivery_number', 'employee')
    read_only_fields = ('id', 'insert_time')
    extra_kwargs = {"amount": {"error_messages": {"invalid": "Test Message"}}}

views.py

class Form(APIView):

renderer_classes = [TemplateHTMLRenderer]
template_name = 'zulieferung/form.html'

def get(self, request):
    materials = Material.objects.distinct('material_unit_id')
    return Response({'all_materials': materials})

def post(self, request):
    materials = Material.objects.all()
    serializer = DataSerializer(data=request.data)
    if serializer.is_valid():
        serializer.save()
        return Response({'all_materials': materials}, status=status.HTTP_201_CREATED)
    return Response({'serializer': serializer}, status=status.HTTP_400_BAD_REQUEST)

And instead of Test Message in my template I have [ErrorDetail(string='Test Message', code='invalid')]

Solution

You should try in your template

{% for error in serializer.amount.errors %}
    {{ error }}
{% endofor %}

But I do not understand why do you use django rest_framework with HTML templates. Rest framework is used for REST APIs which is definitely not this case. For this purpose use rather django.forms. It really does not make sense to use REST serializer directly rendered to the HTML template.

Links:

Working with forms

When to use REST framework

Answered By - Kryštof Řeháček