[英]Django: manage.py loaddata is returning 'Deserialization Error'
[英]Django fails to loaddata with deserialization error
我正在運行在 django 上運行的dumpdata
,並且在運行轉儲數據時會發生以下情況
python manage.py dumpdata --indent 2 --output dumps.json
CommandError: Unable to serialize database: no such table: wagtailimages_uploadedimage
之后,我刪除 sqlite 數據庫並從應用程序migrations
目錄中刪除遷移,這樣我就可以擁有一個空數據庫並測試轉儲的數據。 運行migrate
后,我執行loaddata dump1.json
並出現以下錯誤
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':
我還嘗試使用以下方法排除一些我在傾倒時不需要的東西
dumpdata --natural-foreign --indent 2 -e contenttypes -e auth.permission -e wagtailcore.groupcollectionpermission -e wagtailcore.grouppagepermission -e wagtailimages.rendition -e sessions > dump1.json
但它沒有任何區別。
該應用程序是一個簡單的博客,遵循 此處顯示的演示。
使用--output
代替>
以避免將控制台(stdout)調試信息發送到您的轉儲數據,同時排除不相關的模型
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
根據您的 output,轉儲的數據為空,因此會引發以下錯誤。
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
轉儲數據的方法:
python manage.py makemigrations
python manage.py migrate
python manage.py dumpdata -output my_dumps.json
然后,檢查 my_dumps.json 文件,如果里面有一些數據,那么你可以嘗試使用python manage.py loaddata my_dumps.json
加載數據
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