[英]Relation does not exist Django Postgres
我最近将数据库从 sqlite3 更改为 Postgres。 我的 Django 应用程序运行良好,但是当我转到管理页面并单击我的预测模型时,它说
/admin/Atlus/predicts/ 处的编程错误
关系“Atlus_predicts”不存在第 1 行:SELECT COUNT(*) AS “__count” FROM “Atlus_predicts”
模型.py
from django.db import models
from django import forms
class predicts(models.Model):
firstname =models.CharField(max_length=15)
info = models.TextField()
def __str__(self):
return self.firstname
追溯
Environment:
Request Method: GET
Request URL: http://localhost:8000/admin/Atlus/predicts/
Django Version: 2.2.5
Python Version: 3.8.0
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'bootstrap4',
'rest_framework',
'corsheaders',
'main',
'accounts',
'Atlus',
'Boomerang']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.locale.LocaleMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
Traceback:
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/db/backends/utils.py" in _execute
84. return self.cursor.execute(sql, params)
The above exception (relation "Atlus_predicts" does not exist
LINE 1: SELECT COUNT(*) AS "__count" FROM "Atlus_predicts"
^
) was the direct cause of the following exception:
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/core/handlers/exception.py" in inner
34. response = get_response(request)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/core/handlers/base.py" in _get_response
115. response = self.process_exception_by_middleware(e, request)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/core/handlers/base.py" in _get_response
113. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/contrib/admin/options.py" in wrapper
606. return self.admin_site.admin_view(view)(*args, **kwargs)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/utils/decorators.py" in _wrapped_view
142. response = view_func(request, *args, **kwargs)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
44. response = view_func(request, *args, **kwargs)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/contrib/admin/sites.py" in inner
223. return view(request, *args, **kwargs)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/utils/decorators.py" in _wrapper
45. return bound_method(*args, **kwargs)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/utils/decorators.py" in _wrapped_view
142. response = view_func(request, *args, **kwargs)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/contrib/admin/options.py" in changelist_view
1672. cl = self.get_changelist_instance(request)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/contrib/admin/options.py" in get_changelist_instance
731. return ChangeList(
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/contrib/admin/views/main.py" in __init__
82. self.get_results(request)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/contrib/admin/views/main.py" in get_results
210. result_count = paginator.count
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/utils/functional.py" in __get__
80. res = instance.__dict__[self.name] = self.func(instance)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/core/paginator.py" in count
91. return c()
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/db/models/query.py" in count
392. return self.query.get_count(using=self.db)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/db/models/sql/query.py" in get_count
504. number = obj.get_aggregation(using, ['__count'])['__count']
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/db/models/sql/query.py" in get_aggregation
489. result = compiler.execute_sql(SINGLE)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/db/models/sql/compiler.py" in execute_sql
1100. cursor.execute(sql, params)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/db/backends/utils.py" in execute
99. return super().execute(sql, params)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/db/backends/utils.py" in execute
67. return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/db/backends/utils.py" in _execute_with_wrappers
76. return executor(sql, params, many, context)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/db/backends/utils.py" in _execute
84. return self.cursor.execute(sql, params)
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/db/utils.py" in __exit__
89. raise dj_exc_value.with_traceback(traceback) from exc_value
File "/home/vipul/anaconda3/envs/librus/lib/python3.8/site-packages/django/db/backends/utils.py" in _execute
84. return self.cursor.execute(sql, params)
Exception Type: ProgrammingError at /admin/Atlus/predicts/
Exception Value: relation "Atlus_predicts" does not exist
LINE 1: SELECT COUNT(*) AS "__count" FROM "Atlus_predicts"
^
这个答案没有解决我的问题---->> 关系不存在 - Django & Postgres
我只有一个管理员帐户,这是我的本地机器。 Github 链接: https : //github.com/dragonblood/Librus谢谢
更改数据库后,您必须运行 python3 manage.py migrate 。 您还需要在您的 virtualenv 中安装 psycopg2 并像这样设置 django 设置:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'postgres',
'USER': 'postgres',
'PASSWORD': 'postgres',
'HOST': '127.0.0.1',
'PORT': '5432',
}
}
replace this with database code in settings.py (use your db name,user,password)
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql',
'NAME': 'mydjangodb',
'USER': 'root',
'PASSWORD': 'CSGOroot',
'HOST': 'localhost'
}
}
安装 psycopg 2 数据库适配器执行迁移
python manage.py migrate
python manage.py makemigrations (your app name)
python manage.py migrate
这应该做
尝试:删除迁移文件夹中以前迁移的文件(文件名类似于 001_initial.py)然后再次执行迁移
始终先运行 makemigration,而不是 migrate。
settings.py 中的 DATABASE 变量需要将您指向首选数据库。 Psycopg2 也是必需的,如果您无法安装第一个,则需要 psycopg2-binary。
请参阅数据库设置的文档。 但是,正如已经回答的那样,请检查 settings.py 中的数据库设置。
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