Python Django-变量在创建对象之前删除自身？

考虑一下这个片段：

if fire_prim is not None:
    print('Fire Primary is definitely not Null, here is proof: {}'.format(fire_prim))
    fire_primary_obj = LifeSafety.objects.create(
        name='Fire Primary', 
        store=store_obj, 
        phone_line=fire_prim, 
        phone_line_provider=an_provider)

Fire Primary is definitely not Null, here is proof: +16077244546
Traceback (most recent call last):
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Python\lib\site-packages\django\db\backends\sqlite3\base.py", line 298, in execute
    return Database.Cursor.execute(self, query, params)
sqlite3.IntegrityError: NOT NULL constraint failed: stores_lifesafety.phone_line

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Users\admin-dksc104694\Desktop\Dev\it-database\scripts\data.py", line 246, in update_lifesafety_devices
    fire_primary_obj = LifeSafety.objects.create(name='Fire Primary', store=store_obj, phone_line=fire_prim, phone_line_provider=an_provider)
  File "C:\Python\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:\Python\lib\site-packages\django\db\models\query.py", line 413, in create
    obj.save(force_insert=True, using=self.db)
  File "C:\Python\lib\site-packages\django\db\models\base.py", line 718, in save
    force_update=force_update, update_fields=update_fields)
  File "C:\Python\lib\site-packages\django\db\models\base.py", line 748, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "C:\Python\lib\site-packages\django\db\models\base.py", line 831, in _save_table
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
  File "C:\Python\lib\site-packages\django\db\models\base.py", line 869, in _do_insert
    using=using, raw=raw)
  File "C:\Python\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:\Python\lib\site-packages\django\db\models\query.py", line 1136, in _insert
    return query.get_compiler(using=using).execute_sql(return_id)
  File "C:\Python\lib\site-packages\django\db\models\sql\compiler.py", line 1289, in execute_sql
    cursor.execute(sql, params)
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 100, in execute
    return super().execute(sql, params)
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 68, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 77, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Python\lib\site-packages\django\db\utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Python\lib\site-packages\django\db\backends\sqlite3\base.py", line 298, in execute
    return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: NOT NULL constraint failed: stores_lifesafety.phone_line

我们得到以下输出：

if fire_prim is not None:
    print('Fire Primary is definitely not Null, here is proof: {}'.format(fire_prim))
    fire_primary_obj = LifeSafety.objects.create(
        name='Fire Primary', 
        store=store_obj, 
        phone_line=fire_prim, 
        phone_line_provider=an_provider)

Fire Primary is definitely not Null, here is proof: +16077244546
Traceback (most recent call last):
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Python\lib\site-packages\django\db\backends\sqlite3\base.py", line 298, in execute
    return Database.Cursor.execute(self, query, params)
sqlite3.IntegrityError: NOT NULL constraint failed: stores_lifesafety.phone_line

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Users\admin-dksc104694\Desktop\Dev\it-database\scripts\data.py", line 246, in update_lifesafety_devices
    fire_primary_obj = LifeSafety.objects.create(name='Fire Primary', store=store_obj, phone_line=fire_prim, phone_line_provider=an_provider)
  File "C:\Python\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:\Python\lib\site-packages\django\db\models\query.py", line 413, in create
    obj.save(force_insert=True, using=self.db)
  File "C:\Python\lib\site-packages\django\db\models\base.py", line 718, in save
    force_update=force_update, update_fields=update_fields)
  File "C:\Python\lib\site-packages\django\db\models\base.py", line 748, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "C:\Python\lib\site-packages\django\db\models\base.py", line 831, in _save_table
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
  File "C:\Python\lib\site-packages\django\db\models\base.py", line 869, in _do_insert
    using=using, raw=raw)
  File "C:\Python\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:\Python\lib\site-packages\django\db\models\query.py", line 1136, in _insert
    return query.get_compiler(using=using).execute_sql(return_id)
  File "C:\Python\lib\site-packages\django\db\models\sql\compiler.py", line 1289, in execute_sql
    cursor.execute(sql, params)
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 100, in execute
    return super().execute(sql, params)
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 68, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 77, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Python\lib\site-packages\django\db\utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "C:\Python\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Python\lib\site-packages\django\db\backends\sqlite3\base.py", line 298, in execute
    return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: NOT NULL constraint failed: stores_lifesafety.phone_line

前置问题：

    print('Fire Primary is definitely not Null, here is proof: {}'.format(fire_prim))

    fire_primary_obj = LifeSafety.objects.create(
        name = 'Fire Primary', 
        store = store_obj, 
        phone_line = '+16077244546', 
        phone_line_provider = an_provider
    )

• 我在对象上允许Null，并让代码运行& 毫不奇怪，创建了对象，但

  phone\u line

  为空
• 我正在使用图书馆
• 我可以从shell中“模拟”这个精确的代码&每次都使用正确的值创建对象
• 上面的代码片段完全如图所示，在打印

  fire\u prim

  和尝试创建之间没有任何区别

---

发布问题：

    print('Fire Primary is definitely not Null, here is proof: {}'.format(fire_prim))

    fire_primary_obj = LifeSafety.objects.create(
        name = 'Fire Primary', 
        store = store_obj, 
        phone_line = '+16077244546', 
        phone_line_provider = an_provider
    )

• 将

  phone\u-line

  更改为CharField，而不是PhoneNumberField&电话号码正常。我也要在他们的网站上发表一篇文章
• 创建实例时，将字符串显式用作

  phone\u line

• 再次验证，这可以从shell完成，不会出现问题
  输入：生命安全.objects.create（name='Fire Primary'，store=store，phone_line='+16077244546'）
  输出：生命安全：主要火灾（指示QuerySet）

---

有趣的是，当我在创建时显式使用该字符串时，对象确实使用该字符串填充了

phone\u line

来创建，但我仍然得到了错误

输入：

    print('Fire Primary is definitely not Null, here is proof: {}'.format(fire_prim))

    fire_primary_obj = LifeSafety.objects.create(
        name = 'Fire Primary', 
        store = store_obj, 
        phone_line = '+16077244546', 
        phone_line_provider = an_provider
    )

输出与上述堆栈跟踪相同（仅在差异检查器中存在名称差异）

我可以进入admin并查看它是否已创建，但我仍然得到

notnull约束

异常

---

只是为了确保，在您的模型中，您的导入语句类似于phonenumber\u字段中的

。模型字段导入PhoneNumberField

，对吗？我知道django phonenumber字段插件在其他模块（例如表单和序列化程序）中也有一个

PhoneNumberField

。

+16077244546

是否是

PhoneNumberField

的有效值？两个问题都是。我可以将其复制并粘贴到shell中，并得到预期的结果，但是使用此脚本运行失败。当我回到办公桌上时，我会发布更多关于我的环境的详细信息。@code你能试着传递一些类似于

PhoneNumberField（“+16077244546”）

instance的东西吗。而不是string@YugandharChaudhari请参见上面的编辑后问题。这是可行的，但仍会引发异常。我可以抓住它，继续前进，但我不想那样做。