尝试启动并运行Rails应用程序。我从同事在schema.rb中给出的以下表定义中得到此错误。
ActiveRecord::StatementInvalid: Mysql2::Error: Incorrect table definition; there can be only one auto column and it must be defined as a key
表定义:
create_table "wv latest", id: false, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
t.integer "id", null: false, auto_increment: true
t.string "cid", limit: 10
t.integer "visit_id"
t.string "cfname", limit: 20
t.string "clname", limit: 25
end
当我删除
auto_increment: true
错误消失了。为什么会发生这种情况,为什么该模式在我的设置中不起作用?
答案 0 :(得分:0)
错误消息告诉您,只有该列可以自动递增,并且该列也必须是主键。因此,请尝试将id
列设为主键:
create_table "wv latest", id: false, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
t.integer "id", null: false, auto_increment: true, primary_key: true
t.string "cid", limit: 10
t.integer "visit_id"
t.string "cfname", limit: 20
t.string "clname", limit: 25
end