如何从 Django 中的特定表单中获取字段类？

问题描述

我正在尝试为用户名字段编写测试，我想使用 SimpleTestCase.assertFieldOutput()。问题是我无法从表单的字段中获取字段类：

import django
from django.test import TestCase

    class UserRegistrationTest(TestCase):
    """Tests for the user registration page."""

    def test_username_field(self):
        data = {'username': 'павел25','password1': 'njkdpojv34','password2': 'njkdpojv34','email': '[e-mail]','first_name': 'Pavel','last_name': 'Shlepnev'}
        f = RegistrationForm(data)
        self.assertFieldOutput(f.fields['username'],{'pavel25': 'pavel25'},{'павел25': ['Имя пользователя должно содержать только символы ASCII.']})

当我运行测试时，它会引发 TypeError: 'UsernameField' object is not callable

解决方法

这是访问表单数据的方式：

form_data = f.cleaned_data
username = form_data['username']

等等

,

包装在 type() 函数中似乎有效。它给了我一个类对象，这是我在 fieldclass 的 SimpleTestCase.assertFieldOutput() 参数中需要的。

>>> type(f.fields['username'])
<class 'django.contrib.auth.forms.UsernameField'>

测试运行没有错误并产生有效的输出：

import django
from django.test import TestCase

class UserRegistrationTest(TestCase):
"""Tests for the user registration page."""

    def test_username_field(self):
        data = {'username': 'павел25','password1': 'njkdpojv34','password2': 'njkdpojv34','email': '[e-mail]','first_name': 'Pavel','last_name': 'Shlepnev'}
        f = RegistrationForm(data)
        self.assertFieldOutput(type(f.fields['username']),{'pavel25': 'pavel25'},{'павел25': ['Имя пользователя должно содержать только символы ASCII.']})

    ======================================================================
    FAIL: test_username_field (accounts.tests.UserRegistrationTest)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "C:\Users\pavel\source\repos\Speak the Truth\accounts\tests.py",line 43,in test_username_field
        self.assertFieldOutput(type(f.fields['username']),{'павел25': ['Имя пользователя должно содержать только символы ASCII.']})
      File "C:\Users\pavel\source\repos\Speak the Truth\env\lib\site-packages\django\test\testcases.py",line 760,in assertFieldOutput
        required.clean(input)
    AssertionError: ValidationError not raised

    ----------------------------------------------------------------------