python - Django 1.8 错误 : No database fixture specified

Question

我使用的是 sqlite 数据库，在应用 python manage.py dumpdata 之后，我在 settings 中添加了新的 postgresql 数据库设置.py

DATABASES = {
'default': {
    'ENGINE': 'django.db.backends.postgresql_psycopg2',
    'NAME': 'music',                      
    'USER': '**',
    'PASSWORD': '****',
    'HOST': '127.0.0.1',
    'PORT': '5432',
    }
  }

但是当我尝试将数据加载到新的 postgresql 数据库中时，出现以下错误

C:\Users\Saket\musicalguru>python manage.py loaddata
usage: manage.py loaddata [-h] [--version] [-v {0,1,2,3}]
                      [--settings SETTINGS] [--pythonpath PYTHONPATH]
                      [--traceback] [--no-color] [--database DATABASE]
                      [--app APP_LABEL] [--ignorenonexistent]
                      fixture [fixture ...]
manage.py loaddata: error: No database fixture specified. Please provide the  path of at least one fixture in the command line.

无法理解错误是什么。我的 sqlite 数据库中已有数据，因此我还需要 postgresql 数据库中的新数据。

Answer 1

你能展示一下你是如何进行数据转储的吗？如果您查看 dumpdata docs ，你会看到它:

Outputs to standard output all data in the database associated with the named application(s).

和:

By default, dumpdata will format its output in JSON

现在，如果您查看错误，您会发现缺少数据库固定装置。 loaddata docs告诉固定装置是什么以及 Django 将在哪里寻找固定装置:

A fixture is a collection of files that contain the serialized contents of the database. Each fixture has a unique name, and the files that comprise the fixture can be distributed over multiple directories, in multiple applications.

Django will search in three locations for fixtures:

1. In the fixtures directory of every installed application
2. In any directory named in the FIXTURE_DIRS setting
3. In the literal path named by the fixture

因此，可以使用将数据转储到的文件:

./manage.py dumpdata ... > mydata.json
./manage.py loaddata mydata.json