如何在 Django 中向用戶 model 添加具有默認值的字段

Question

我需要向用戶 model 添加字段，默認值不會顯示在注冊表單中，但我是 Django 的新手。 我該如何實施它，我做錯了什么？ 模型.py：

from django.contrib.auth.models import AbstractUser
from django.db import models


class CustomUser(AbstractUser):
    level = models.IntegerField(default=0)

forms.py：

from django import forms
from django.contrib.auth.forms import UserCreationForm, AuthenticationForm
from .models import CustomUser


class RegisterUserForm(UserCreationForm):
    username = forms.CharField(label="Имя", widget=forms.TextInput(attrs={'class': 'register__form-title form-control form-input',
                                                                          'placeholder': 'введите ваше имя'}))
    email = forms.CharField(label="Почта", widget=forms.TextInput(attrs={'class': 'register__form-title form-control form-control',
                                                                          'placeholder': 'введите вашу почту'}))
    password1 = forms.CharField(label="Пароль", widget=forms.TextInput(attrs={'class': 'register__form-title form-control form-input',
                                                                          'placeholder': 'введите пароль'}))
    password2 = forms.CharField(label="Подтверждение пароля", widget=forms.TextInput(attrs={'class': 'register__form-title form-control form-input',
                                                                          'placeholder': 'подтвердите ваш пароль'}))

    def __init__(self, *args, **kwargs):
        super(UserCreationForm, self).__init__(*args, **kwargs)
        for field_name in ['username', 'email', 'password1', 'password2']:
            self.fields[field_name].help_text = None

    class Meta:
        model = CustomUser
        fields = ('username', 'email', 'password1', 'password2')

視圖.py：

from django.contrib.auth import logout
from django.contrib.auth.views import LoginView
from django.shortcuts import render, redirect
from django.urls import reverse_lazy
from django.views.generic import CreateView

from .forms import RegisterUserForm, LoginUserForm


class RegisterUser(CreateView):
    form_class = RegisterUserForm
    success_url = reverse_lazy('login')
    template_name = 'users/register.html'

設置.py：

AUTH_USER_MODEL = 'users.CustomUser'

Answer 1

如果您只想使用占位符，只需從 model 中刪除默認值，因為表單中的值會取代占位符。

如果這不是一個選項，那么您可以在表單字段中定義一個初始參數

這是一個例子：

class NewSomeModel(forms.ModelForm):
    title = forms.CharField(
        initial=None,
        widget=forms.TextInput(attrs={'placeholder': 'Myplaceholdertext'})
    )

    def clean_title(self):
        title = self.cleaned_data['title']
        return title or 'some-default-value-here'
    
    class Meta:
        model = SomeModel
        fields = ['title']