Django指向错误的Postgres版本

Question

我通过删除Postgres.app桌面应用程序将Postgres.app从9.6降级到9.5。 我通过执行更新数据库

（我通过下载Postgres.app桌面应用程序下载了Postgres，并通过pip install Django安装了Django）

sudo /usr/libexec/locate.updatedb

看起来它是从正确的目录启动数据库。

/Applications/Postgres.app/Contents/Versions/9.5/bin/initdb
/Applications/Postgres.app/Contents/Versions/9.5/share/doc/postgresql/html/app-initdb.html
/Applications/Postgres.app/Contents/Versions/9.5/share/man/man1/initdb.1

但是，当我尝试在Django应用中进行迁移时，看起来该路径仍指向9.6版的Postgress

Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/me/Desktop/myapp/venv/lib/python2.7/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
    utility.execute()
  File "/Users/me/Desktop/myapp/venv/lib/python2.7/site-packages/django/core/management/__init__.py", line 341, in execute
    django.setup()
  File "/Users/me/Desktop/myapp/venv/lib/python2.7/site-packages/django/__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/Users/me/Desktop/myapp/venv/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate
    app_config.import_models(all_models)
  File "/Users/me/Desktop/myapp/venv/lib/python2.7/site-packages/django/apps/config.py", line 199, in import_models
    self.models_module = import_module(models_module_name)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/Users/me/Desktop/myapp/venv/lib/python2.7/site-packages/tenant_schemas/models.py", line 4, in <module>
    from tenant_schemas.postgresql_backend.base import _check_schema_name
  File "/Users/me/Desktop/myapp/venv/lib/python2.7/site-packages/tenant_schemas/postgresql_backend/base.py", line 14, in <module>
    import psycopg2
  File "/Users/me/Desktop/myapp/venv/lib/python2.7/site-packages/psycopg2/__init__.py", line 50, in <module>
    from psycopg2._psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID
ImportError: dlopen(/Users/me/Desktop/myapp/venv/lib/python2.7/site-packages/psycopg2/_psycopg.so, 2): Library not loaded: /Applications/Postgres.app/Contents/Versions/9.6/lib/libpq.5.dylib
  Referenced from: /Users/me/Desktop/myapp/venv/lib/python2.7/site-packages/psycopg2/_psycopg.so
  Reason: image not found

Answer 1

这为我解决了问题：

1. 卸载您的psycopg2

   pip卸载psycopg2

2. 然后做这个

   pip --no-cache-dir install -U psycopg2

Answer 2

我认为您的问题是当前安装的psycopg2版本引用了与先前安装的postgres捆绑在一起的C postgres库（ /Applications/Postgres.app/Contents/Versions/9.6/lib/libpq.5.dylib ）。

尝试卸载并重新安装psycopg2 。

pip uninstall psycopg2
pip install psycopg2