你的模型是@Messages，改成@message.

像你应该使用迁移一样改变它:

To change it like you should use migration:

def change
  rename_table :old_table_name, :new_table_name
end

当然不要手动创建该文件，而是使用 rails 生成器:

Of course do not create that file by hand but use rails generator:

rails g migration ChangeMessagesToMessage

这将在 'db 目录中生成名称具有正确时间戳的新文件.然后运行:

That will generate new file with proper timestamp in name in 'db dir. Then run:

rake db:migrate

从那时起您的应用应该没问题.

And your app should be fine since then.