ruby-on-rails - PG :Error relation does not exist

Question

我正在使用 Rails 3.2.x，同时也在使用 RailsAdmin。

我运行了很多次迁移并多次更改了我的数据库结构。结果，我得到一个 PG:Error 说对于一个实际上不存在的表不存在关系。

这是错误:

ActiveRecord::StatementInvalid at /
PG::Error: ERROR:  relation "addresses" does not exist
LINE 5:              WHERE a.attrelid = '"addresses"'::regclass
                                        ^
:             SELECT a.attname, format_type(a.atttypid, a.atttypmod),
                     pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod

简而言之，当我转到 /admin 时，我的 development.log 中显示的错误是:

Started GET "/admin" for 127.0.0.1 at 2013-07-04 02:24:07 -0500
Processing by RailsAdmin::MainController#dashboard as HTML
  Cart Load (0.5ms)  SELECT "carts".* FROM "carts" WHERE "carts"."id" = $1 LIMIT 1  [["id", 5]]
  User Load (0.4ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 1 LIMIT 1
   (0.6ms)  SELECT COUNT(*) FROM "roles" INNER JOIN "users_roles" ON "roles"."id" = "users_roles"."role_id" WHERE "users_roles"."user_id" = 1 AND (((roles.name = 'admin') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL)))
   (0.6ms)  SELECT COUNT(*) FROM "roles" INNER JOIN "users_roles" ON "roles"."id" = "users_roles"."role_id" WHERE "users_roles"."user_id" = 1 AND (((roles.name = 'seller') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL)))
PG::Error: ERROR:  relation "addresses" does not exist
LINE 5:              WHERE a.attrelid = '"addresses"'::regclass
                                        ^
:             SELECT a.attname, format_type(a.atttypid, a.atttypmod),
                     pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
              FROM pg_attribute a LEFT JOIN pg_attrdef d
                ON a.attrelid = d.adrelid AND a.attnum = d.adnum
             WHERE a.attrelid = '"addresses"'::regclass
               AND a.attnum > 0 AND NOT a.attisdropped
             ORDER BY a.attnum

Completed 500 Internal Server Error in 1269ms

ActiveRecord::StatementInvalid - PG::Error: ERROR:  relation "addresses" does not exist
LINE 5:              WHERE a.attrelid = '"addresses"'::regclass
                                        ^
:             SELECT a.attname, format_type(a.atttypid, a.atttypmod),
                     pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
              FROM pg_attribute a LEFT JOIN pg_attrdef d
                ON a.attrelid = d.adrelid AND a.attnum = d.adnum
             WHERE a.attrelid = '"addresses"'::regclass
               AND a.attnum > 0 AND NOT a.attisdropped
             ORDER BY a.attnum

我该如何解决这个问题？

Answer 1

我的建议是删除并重新创建整个数据库。执行此操作时，您可能会在迁移过程中遇到一些问题 - 修复所有问题，以便全新安装应用程序成为可能。