python - Django 无法加载数据并出现反序列化错误
问题描述
我正在运行在 django 上运行的 Wagtail,并且在运行dumpdata
时会发生以下情况
python manage.py dumpdata --indent 2 --output dumps.json
CommandError: Unable to serialize database: no such table: wagtailimages_uploadedimage
之后,我删除了 sqlite 数据库并从应用程序migrations
目录中删除了迁移,这样我就可以拥有一个空数据库并测试转储的数据。运行后migrate
我执行 loaddata dump1.json
并出现以下错误
Tracking file by folder pattern: migrations
Traceback (most recent call last):
File "/home/user/Desktop/projects/mytestwebapp/venv/lib/python3.8/site-packages/django/core/serializers/json.py", line 68, in Deserializer
objects = json.loads(stream_or_string)
File "/usr/lib/python3.8/json/__init__.py", line 357, in loads
return _default_decoder.decode(s)
File "/usr/lib/python3.8/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python3.8/json/decoder.py", line 355, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/opt/pycharm-professional/plugins/python/helpers/pycharm/django_manage.py", line 52, in <module>
run_command()
File "/opt/pycharm-professional/plugins/python/helpers/pycharm/django_manage.py", line 46, in run_command
run_module(manage_file, None, '__main__', True)
File "/usr/lib/python3.8/runpy.py", line 207, in run_module
return _run_module_code(code, init_globals, run_name, mod_spec)
File "/usr/lib/python3.8/runpy.py", line 97, in _run_module_code
_run_code(code, mod_globals, init_globals,
File "/usr/lib/python3.8/runpy.py", line 87, in _run_code
exec(code, run_globals)
File "/home/user/Desktop/projects/mytestwebapp/manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/user/Desktop/projects/mytestwebapp/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
utility.execute()
File "/home/user/Desktop/projects/mytestwebapp/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/user/Desktop/projects/mytestwebapp/venv/lib/python3.8/site-packages/django/core/management/base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/user/Desktop/projects/mytestwebapp/venv/lib/python3.8/site-packages/django/core/management/base.py", line 364, in execute
output = self.handle(*args, **options)
File "/home/user/Desktop/projects/mytestwebapp/venv/lib/python3.8/site-packages/django/core/management/commands/loaddata.py", line 72, in handle
self.loaddata(fixture_labels)
File "/home/user/Desktop/projects/mytestwebapp/venv/lib/python3.8/site-packages/django/core/management/commands/loaddata.py", line 114, in loaddata
self.load_label(fixture_label)
File "/home/user/Desktop/projects/mytestwebapp/venv/lib/python3.8/site-packages/django/core/management/commands/loaddata.py", line 172, in load_label
for obj in objects:
File "/home/user/Desktop/projects/mytestwebapp/venv/lib/python3.8/site-packages/django/core/serializers/json.py", line 73, in Deserializer
raise DeserializationError() from exc
django.core.serializers.base.DeserializationError: Problem installing fixture '/home/user/Desktop/projects/mytestwebapp/dump1.json':
我还尝试使用以下方法排除一些我在倾倒时不需要的东西
dumpdata --natural-foreign --indent 2 -e contenttypes -e auth.permission -e wagtailcore.groupcollectionpermission -e wagtailcore.grouppagepermission -e wagtailimages.rendition -e sessions > dump1.json
但它没有任何区别。
该应用程序是一个简单的博客,遵循此处显示的演示。
解决方案
使用--output
而不是>
避免向您转储的数据发送控制台(标准输出)调试信息,同时排除不相关的模型
python manage.py dumpdata --natural-foreign --indent 2 -e contenttypes -e auth.permission -e wagtailcore.groupcollectionpermission -e wagtailcore.grouppagepermission -e wagtailimages.rendition -e sessions -e wagtailimages.uploadedimage --output dumps.json
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