我有一个Django的问题很难理解。
我使用models.py来建模我的数据库。此数据库在生产服务器上运行。我想改变它，所以我在开发服务器上创建了一个新的数据库。问题发生在我syncdb时，Django尝试创建两个相同的表，如下所示：
python manage.py syncdb
Operations to perform:
Synchronize unmigrated apps: inventaryApp, newPrpvApp, grappelli, debug_toolbar, registration, import_export
Apply all migrations: sitetree, sessions, admin, sites, auth, contenttypes
Synchronizing apps without migrations:
Creating tables...
Creating table u_institutions
Creating table u_users
Creating table o_organes
Creating table o_degats
Creating table o_validation
Creating table o_m_determination
Creating table o_stades_dvlpmt
Creating table o_types
Creating table precision_date
Creating table t_categories
Creating table t_etat_synonymie
Creating table g_langues
Creating table g_pays
Creating table g_regions
Creating table g_communes
Creating table pays_langues
Creating table newprpvapp_userprofile
Creating table t_noms_verna
Creating table langues_noms_verna
Creating table maladies
Creating table t_familles
Creating table t_genres
Creating table t_especes
Creating table images
Creating table esp_noms_verna
Creating table t_infra_types
Creating table t_infra_sp
Creating table t_synonymes
Creating table o_contexte
Creating table o_interception
Creating table o_hotes
Creating table hotes_organes
Creating table o_organismes_associes
Creating table u_institutions
如您所见，u_institutions表是第一个创建的，也是最后一个。这就是命令执行停止显示的地方：
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/base.py", line 533, in handle
return self.handle_noargs(**options)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/commands/syncdb.py", line 27, in handle_noargs
call_command("migrate", **options)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 115, in call_command
return klass.execute(*args, **defaults)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 128, in handle
created_models = self.sync_apps(connection, executor.loader.unmigrated_apps)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 239, in sync_apps
cursor.execute(statement)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 81, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 63, in execute
return self.cursor.execute(sql)
django.db.utils.ProgrammingError: relation "u_institutions" already exists
我已经确认该表未在model.py中设置两次，但事实并非如此。我使用Django 1.7和psycopg 2.6。你有什么想法吗？谢谢大家！
修改
我已经执行了makemigrations，一切都很好。现在它表明没有检测到任何变化，这可能是正常的。
当我尝试migrate时，我得到：
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 128, in handle
created_models = self.sync_apps(connection, executor.loader.unmigrated_apps)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 239, in sync_apps
cursor.execute(statement)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 81, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 63, in execute
return self.cursor.execute(sql)
django.db.utils.ProgrammingError: relation "u_institutions" already exists
migrate --fake返回：
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 128, in handle
created_models = self.sync_apps(connection, executor.loader.unmigrated_apps)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 239, in sync_apps
cursor.execute(statement)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 81, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/home/hugo/DEV/.virtualenvs/env_eprpv/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 63, in execute
return self.cursor.execute(sql)
django.db.utils.ProgrammingError: relation "u_institutions" already exists
答案 0 :(得分：0)
您似乎已经创建了数据库架构。请使用迁移（只要您使用Django 1.7）。 {@ 1}}已被弃用。
syncdb如果您在此处遇到任何错误（例如python manage.py makemigrations
python manage.py migrate
），请运行此命令将此表标记为已应用：
relation "..." already exists