**将github链接到此回购协议:**https://github.com/thetruefuss/elmer
当我使用sqlite作为数据库启动这个项目时,它很好地与数据库一起迁移,但是当我将它切换到POSTGRESQL时,它得到了以下错误:
django.db.utils.ProgrammingError: relation "subjects_subject" does not exist
LINE 1: ...ect"."created", "subjects_subject"."updated" FROM "subjects_...
的要点是:在这个回购中,它已经拥有了所有模型的所有迁移文件,您可以在这个回购中签入,而我不能用pgadmin 4中的数据库迁移这个文件。
db settings.py
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'demo_postgres',
'USER':'postgres',
'PASSWORD':'18092000',
'PORT':'5432',
'HOST':'127.0.0.1',
}
}
**我的命令**
python manage.py migrate
subjects_subject ( migration_file)
class Migration(migrations.Migration):
initial = True
dependencies = [
migrations.swappable_dependency(settings.AUTH_USER_MODEL),
('boards', '0001_initial'),
]
operations = [
migrations.CreateModel(
name='Subject',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('title', models.CharField(db_index=True, max_length=150)),
('slug', models.SlugField(blank=True, max_length=150, null=True)),
('body', models.TextField(blank=True, max_length=5000, null=True)),
('photo', models.ImageField(blank=True, null=True, upload_to='subject_photos/', verbose_name='Add image (optional)')),
('rank_score', models.FloatField(default=0.0)),
('active', models.BooleanField(default=True)),
('created', models.DateTimeField(default=django.utils.timezone.now)),
('updated', models.DateTimeField(auto_now=True)),
('author', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='posted_subjects', to=settings.AUTH_USER_MODEL)),
('board', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='submitted_subjects', to='boards.Board')),
('mentioned', models.ManyToManyField(blank=True, related_name='m_in_subjects', to=settings.AUTH_USER_MODEL)),
('points', models.ManyToManyField(blank=True, related_name='liked_subjects', to=settings.AUTH_USER_MODEL)),
],
options={
'ordering': ('-created',),
},
),
]
subjects_subject(model_file)
class Subject(models.Model):
"""
Model that represents a subject.
"""
title = models.CharField(max_length=150, db_index=True)
slug = models.SlugField(max_length=150, null=True, blank=True)
body = models.TextField(max_length=5000, blank=True, null=True)
photo = models.ImageField(
upload_to='subject_photos/', verbose_name=u"Add image (optional)",
blank=True, null=True
)
author = models.ForeignKey(User, related_name='posted_subjects', on_delete=models.CASCADE)
board = models.ForeignKey(Board, related_name='submitted_subjects', on_delete=models.CASCADE)
points = models.ManyToManyField(
settings.AUTH_USER_MODEL, related_name='liked_subjects', blank=True
)
mentioned = models.ManyToManyField(
User, related_name='m_in_subjects', blank=True
)
rank_score = models.FloatField(default=0.0)
active = models.BooleanField(default=True)
created = models.DateTimeField(default=timezone.now)
updated = models.DateTimeField(auto_now=True)
class Meta:
ordering = ('-created',)
编辑:1(完全跟踪)
File "E:\Python\elmer\manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "E:\Python\elmer\venv\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "E:\Python\elmer\venv\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "E:\Python\elmer\venv\lib\site-packages\django\core\management\base.py", line 316, in run_from_argv
self.execute(*args, **cmd_options)
File "E:\Python\elmer\venv\lib\site-packages\django\core\management\base.py", line 350, in execute
self.check()
File "E:\Python\elmer\venv\lib\site-packages\django\core\management\base.py", line 376, in check
all_issues = self._run_checks(
File "E:\Python\elmer\venv\lib\site-packages\django\core\management\commands\migrate.py", line 60, in _run_checks
issues.extend(super()._run_checks(**kwargs))
File "E:\Python\elmer\venv\lib\site-packages\django\core\management\base.py", line 366, in _run_checks
return checks.run_checks(**kwargs)
File "E:\Python\elmer\venv\lib\site-packages\django\core\checks\registry.py", line 71, in run_checks
new_errors = check(app_configs=app_configs)
File "E:\Python\elmer\venv\lib\site-packages\django\core\checks\urls.py", line 13, in check_url_config
return check_resolver(resolver)
File "E:\Python\elmer\venv\lib\site-packages\django\core\checks\urls.py", line 23, in check_resolver
return check_method()
File "E:\Python\elmer\venv\lib\site-packages\django\urls\resolvers.py", line 396, in check
for pattern in self.url_patterns:
File "E:\Python\elmer\venv\lib\site-packages\django\utils\functional.py", line 37, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "E:\Python\elmer\venv\lib\site-packages\django\urls\resolvers.py", line 533, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "E:\Python\elmer\venv\lib\site-packages\django\utils\functional.py", line 37, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "E:\Python\elmer\venv\lib\site-packages\django\urls\resolvers.py", line 526, in urlconf_module
return import_module(self.urlconf_name)
File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.496.0_x64__qbz5n2kfra8p0\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 790, in exec_module
File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
File "E:\Python\elmer\mysite\urls.py", line 33, in <module>
import subjects.views as subjects_views
File "E:\Python\elmer\subjects\views.py", line 58, in <module>
class TrendingPageView(ListView):
File "E:\Python\elmer\subjects\views.py", line 63, in TrendingPageView
queryset = get_trending_subjects()
File "E:\Python\elmer\subjects\views.py", line 25, in get_trending_subjects
for subject in subjects:
File "E:\Python\elmer\venv\lib\site-packages\django\db\models\query.py", line 268, in __iter__
self._fetch_all()
File "E:\Python\elmer\venv\lib\site-packages\django\db\models\query.py", line 1186, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "E:\Python\elmer\venv\lib\site-packages\django\db\models\query.py", line 54, in __iter__
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
File "E:\Python\elmer\venv\lib\site-packages\django\db\models\sql\compiler.py", line 1065, in execute_sql
cursor.execute(sql, params)
File "E:\Python\elmer\venv\lib\site-packages\django\db\backends\utils.py", line 100, in execute
return super().execute(sql, params)
File "E:\Python\elmer\venv\lib\site-packages\django\db\backends\utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "E:\Python\elmer\venv\lib\site-packages\django\db\backends\utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "E:\Python\elmer\venv\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "E:\Python\elmer\venv\lib\site-packages\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "E:\Python\elmer\venv\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: relation "subjects_subject" does not exist
LINE 1: ...ect"."created", "subjects_subject"."updated" FROM "subjects_...
^
发布于 2020-12-31 07:15:10
您的问题是,您在启动应用程序时正在执行数据库查询,这会导致大量迁移问题,并且通常不鼓励。
在TrendingPageView
类的主体中,您正在调用正在对Subject
模型执行查询的get_trending_subjects()
,您需要将其移动到一个方法中,这样它就不会在启动时被调用,而是在访问视图时被调用。
class TrendingPageView(ListView):
model = Subject
paginate_by = 15
template_name = 'subjects/trending.html'
context_object_name = 'subjects'
def get_queryset(self):
return get_trending_subjects()
https://stackoverflow.com/questions/65516637
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