python - 属性错误 : module 'MySQLdb.constants.FIELD_TYPE' has no attribute 'JSON' while migrating in Django

Question

我不知道以什么方式解决这个错误。任何提示？我有简单的 Django 项目，并在尝试执行 python3 manage.py migrate 时收到此错误。这与应用程序中的任何编程错误有关，或者这可能与 mysql 的安装及其软件包的完整性有关吗？可能 manage.py 文件有什么错误？或者这可能是 Django 和 mysql 不兼容版本的情况？

Traceback (most recent call last):
 File "manage.py", line 23, in <module>
execute_from_command_line(sys.argv)
File "/home/anna/.local/lib/python3.7/site-packages/django/core/management/__init__.py",      
line 401, in execute_from_command_line
utility.execute()
File "/home/anna/.local/lib/python3.7/site-packages/django/core/management/__init__.py",    
line 377, in execute
django.setup()
File "/home/anna/.local/lib/python3.7/site-packages/django/__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "/home/anna/.local/lib/python3.7/site-packages/django/apps/registry.py", line 114, in     
populate
app_config.import_models()
File "/home/anna/.local/lib/python3.7/site-packages/django/apps/config.py", line 211, in   
import_models
self.models_module = import_module(models_module_name)
File "/usr/lib/python3.7/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/home/anna/.local/lib/python3.7/site-packages/django/contrib/auth/models.py", line 2,   
in <module>
from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
File "/home/anna/.local/lib/python3.7/site-packages/django/contrib/auth/base_user.py", line 
48, in <module>
class AbstractBaseUser(models.Model):
File "/home/anna/.local/lib/python3.7/site-packages/django/db/models/base.py", line 122, in 
__new__
new_class.add_to_class('_meta', Options(meta, app_label))
File "/home/anna/.local/lib/python3.7/site-packages/django/db/models/base.py", line 326, in 
add_to_class
value.contribute_to_class(cls, name)
File "/home/anna/.local/lib/python3.7/site-packages/django/db/models/options.py", line 206, 
in contribute_to_class
self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
File "/home/anna/.local/lib/python3.7/site-packages/django/db/__init__.py", line 28, in 
__getattr__
return getattr(connections[DEFAULT_DB_ALIAS], item)
File "/home/anna/.local/lib/python3.7/site-packages/django/db/utils.py", line 214, in 
__getitem__
backend = load_backend(db['ENGINE'])
File "/home/anna/.local/lib/python3.7/site-packages/django/db/utils.py", line 111, in 
load_backend
return import_module('%s.base' % backend_name)
File "/usr/lib/python3.7/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "/home/anna/.local/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 
29, in <module>
from .introspection import DatabaseIntrospection            # isort:skip
File "/home/anna/.local/lib/python3.7/site-
packages/django/db/backends/mysql/introspection.py", line 16, in <module>
class DatabaseIntrospection(BaseDatabaseIntrospection):
File "/home/anna/.local/lib/python3.7/site-   
packages/django/db/backends/mysql/introspection.py", line 27, in DatabaseIntrospection
FIELD_TYPE.JSON: 'JSONField',
AttributeError: module 'MySQLdb.constants.FIELD_TYPE' has no attribute 'JSON'

Answer 1

pip install mysqlclient==2.0.1

您需要更新 mysqlclient，版本 2.0.1 是当前版本，它解决了这个缺失的定义。