Forms in Django Rest Framework - django

Question

I'm able to create ModelSeralizers easily, but I am having a little trouble with my Forms. Is there a way to serialize the form below, or do I need to do each form in the native language if I take this to a mobile device?
class SetPasswordForm(forms.Form):
password1 = forms.CharField(label='New password',
widget=forms.PasswordInput(
attrs={'placeholder': 'New password'}))
password2 = forms.CharField(label='Verify new password',
widget=forms.PasswordInput(
attrs={'placeholder': 'Password again'}))
def __init__(self, *args, **kwargs):
self.user = kwargs.pop('user')
super(SetPasswordForm, self).__init__(*args, **kwargs)
def clean_password2(self):
password_length = settings.MIN_PASSWORD_LENGTH
password1 = self.cleaned_data.get("password1")
if len(password1) < password_length:
raise forms.ValidationError(
"Password must be longer than "
"{} characters".format(password_length))
password2 = self.cleaned_data.get("password2")
if password1 and password2:
if password1 != password2:
raise forms.ValidationError("Passwords do not match")
return password2

Answer 1

You can create a serializer named PasswordSerializer which performs the same checking and validation as you are doing above in SetPasswordForm.
We create a serializer having 2 fields password1 and password2.
password1 field has min_length argument passed to it which validates that the input contains no fewer than this number of characters. Also, we define the custom error message for the case in which input is less than min_length in an error_messages dictionary. Doing this removes the validations you were performing earlier in your form and now DRF will handle that for you. Also, the serializer fields have allow_null set to False. So, if None value is sent, DRF automatically handles that.
We need to create a validate() function which checks if the passwords match or not. If the 2 passwords do not match, serializer will raise a ValidationError.
The above code transformed to a DRF serializer will be something like:
from rest_framework import serializers
class PasswordSerializer(serializers.Serializer):
password1 = serializers.CharField(min_length=settings.MIN_PASSWORD_LENGTH, error_messages={'min_length': "Password must be longer than {} characters".format(settings.MIN_PASSWORD_LENGTH)})
password2 = serializers.CharField()
def validate(self, data):
if data['password1'] != data['password2']: # Check if the 2 passwords match
raise serializers.ValidationError("Passwords do not match")
return data