尝试在Heroku上使用django迁移数据库更改时，我得到：
psycopg2.ProgrammingError: permission denied for relation django_migrations
其他人可以通过授予适当的权限来解决此问题（例如Permission denied for relation）。不幸的是，我无法在Heroku爱好层上授予权限或创建新用户。
我能够回滚一些迁移，但最终我得到了：
django.db.utils.ProgrammingError: table "labs_branch_tests" does not exist
并且无法迁移回较新的迁移。
关系django_migrations
的权限已完全追溯 File "manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 364, in execute_from_command_line
utility.execute()
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 356, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py", line 330, in execute
output = self.handle(*args, **options)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 204, in handle
fake_initial=fake_initial,
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 115, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 145, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 250, in apply_migration
self.recorder.record_applied(migration.app_label, migration.name)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/recorder.py", line 73, in record_applied
self.migration_qs.create(app=app, name=name)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/query.py", line 394, in create
obj.save(force_insert=True, using=self.db)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/base.py", line 807, in save
force_update=force_update, update_fields=update_fields)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/base.py", line 837, in save_base
updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/base.py", line 923, in _save_table
result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/base.py", line 962, in _do_insert
using=using, raw=raw)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/query.py", line 1076, in _insert
return query.get_compiler(using=using).execute_sql(return_id)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1107, in execute_sql
cursor.execute(sql, params)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/app/.heroku/python/lib/python3.6/site-packages/django/utils/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: permission denied for relation django_migrations
psycopg2.ProgrammingError的完整追溯：table＆＃34; labs_branch_tests＆＃34;不存在
File "manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 364, in execute_from_command_line
utility.execute()
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 356, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py", line 330, in execute
output = self.handle(*args, **options)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 204, in handle
fake_initial=fake_initial,
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 119, in migrate
state = self._migrate_all_backwards(plan, full_plan, fake=fake)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 194, in _migrate_all_backwards
self.unapply_migration(states[migration], migration, fake=fake)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 264, in unapply_migration
state = migration.unapply(state, schema_editor)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/migration.py", line 178, in unapply
operation.database_backwards(self.app_label, schema_editor, from_state, to_state)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/migrations/operations/fields.py", line 95, in database_backwards
schema_editor.remove_field(from_model, from_model._meta.get_field(self.name))
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 457, in remove_field
return self.delete_model(field.remote_field.through)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 324, in delete_model
"table": self.quote_name(model._meta.db_table),
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 120, in execute
cursor.execute(sql, params)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/app/.heroku/python/lib/python3.6/site-packages/django/utils/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: table "labs_branch_tests" does not exist
答案 0 :(得分：12)
我能够通过在postgres终端中为用户授予权限来解决这个问题。
首先通过Heroku CLI（\c）连接到postgres。
这很笨重但是通过在postgres终端中调用You are now connected to database DATABASE_NAME as user USERNAME来获取您的Heroku postgres用户名。 （输出的最后一行是GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public to USERNAME;
GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA public to USERNAME;
GRANT ALL PRIVILEGES ON ALL FUNCTIONS IN SCHEMA public to USERNAME;
。）
然后像其他人所示的那样授予权限：
SQLSETPROP(0, "DispLogin", 3)
答案 1 :(得分：2)
在我的情况下，这是因为我的免费数据库达到了行数限制，并且撤销了写访问权限：
$ heroku pg:info -r heroku
=== DATABASE_URL
Plan: Hobby-dev
Status: Available
Connections: 0/20
PG Version: 10.4
[..]
Rows: 11683/10000 (Write access revoked)
[..]
答案 2 :(得分：0)
对我来说，您可以确定写访问权限已被撤销
$ heroku pg:info
...
Rows: 11683/10000 (Write access revoked)
但是我不想转储整个数据库。相反，我用
来标识最大的表$ heroku pg:psql
> select
table_name
, pg_relation_size(quote_ident(table_name)) as "raw_size"
, pg_size_pretty(pg_relation_size(quote_ident(table_name)) as "size"
from information_schema.tables
where table_schema = 'public'
order by "raw_size" desc;
然后我用清除最大的表
> delete from <table name>;