NameError 当我将元素添加到数据库时发生

Question

我一次又一次地收到此错误，我不知道为什么我尝试了所有方法但似乎不起作用， 我正在尝试将元素添加到我的主页中！

from django.db import models
class ToDo(models.Model):
      name  = models.CharField(max_length = 200, unique = False)

     def __str__(self):
         return self.name


class Item(models.Model):
    todolist = models.ForeignKey(ToDo, on_delete = models.CASCADE)
    text = models.CharField(max_length = 300)
    complete = models.NullBooleanField()


    def __str__(self):
        return self.text 

我的文本是在该代码中定义的，但我不明白为什么会出现此错误，我尝试了所有方法

In [35]: lt.item_set.create(text = "moon", complete = False)
Out[35]: ---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
~\anaconda3\lib\site-packages\IPython\core\formatters.py in __call__(self, obj)
    700                 type_pprinters=self.type_printers,
    701                 deferred_pprinters=self.deferred_printers)
--> 702             printer.pretty(obj)
    703             printer.flush()
    704             return stream.getvalue()

~\anaconda3\lib\site-packages\IPython\lib\pretty.py in pretty(self, obj)
    392                         if cls is not object \
    393                                 and callable(cls.__dict__.get('__repr__')):
--> 394                             return _repr_pprint(obj, self, cycle)
    395
    396             return _default_pprint(obj, self, cycle)

~\anaconda3\lib\site-packages\IPython\lib\pretty.py in _repr_pprint(obj, p, cycle)
    698     """A pprint that just redirects to the normal repr function."""
    699     # Find newlines and replace them with p.break_()
--> 700     output = repr(obj)
    701     lines = output.splitlines()
    702     with p.group():

~\anaconda3\lib\site-packages\django\db\models\base.py in __repr__(self)
    519
    520     def __repr__(self):
--> 521         return '<%s: %s>' % (self.__class__.__name__, self)
    522
    523     def __str__(self):

~\Desktop\Django\Roman\Apple\funsite\apple\models.py in __str__(self)
     16
     17
---> 18         def __str__(self):
     19                 try:
     20                         return self.text

NameError: name 'text' is not defined

In [36]: lt.item_set.create(text = "moon", complete = False)
Out[36]: ---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
~\anaconda3\lib\site-packages\IPython\core\formatters.py in __call__(self, obj)
    700                 type_pprinters=self.type_printers,
    701                 deferred_pprinters=self.deferred_printers)
--> 702             printer.pretty(obj)
    703             printer.flush()
    704             return stream.getvalue()

~\anaconda3\lib\site-packages\IPython\lib\pretty.py in pretty(self, obj)
    392                         if cls is not object \
    393                                 and callable(cls.__dict__.get('__repr__')):
--> 394                             return _repr_pprint(obj, self, cycle)
    395
    396             return _default_pprint(obj, self, cycle)

~\anaconda3\lib\site-packages\IPython\lib\pretty.py in _repr_pprint(obj, p, cycle)
    698     """A pprint that just redirects to the normal repr function."""
    699     # Find newlines and replace them with p.break_()
--> 700     output = repr(obj)
    701     lines = output.splitlines()
    702     with p.group():

~\anaconda3\lib\site-packages\django\db\models\base.py in __repr__(self)
    519
    520     def __repr__(self):
--> 521         return '<%s: %s>' % (self.__class__.__name__, self)
    522
    523     def __str__(self):

~\Desktop\Django\Roman\Apple\funsite\apple\models.py in __str__(self)
     16
     17
---> 18         def __str__(self):
     19                 return self.text

NameError: name 'text' is not defined

我不明白为什么会出现这个错误

Answer 1

• 首先，在您的终端中，cd 到您的项目文件夹并激活 venv
• 修改models.py中的代码后，运行pyhton manage.py makemigrations [如果您已经执行了命令，您将在 apps 迁移文件夹 中看到一个文件，例如 0001_initial.py]
• 然后运行python manage.py migrate

如果您的问题仍然存在，请提供更多详细信息。

Answer 2

您是否进行过任何迁移并运行它们来创建字段text？如果没有，那么您需要使用 ./manage.py makemigrations ./manage.py migrate 运行它们。