Rails：我可以使用带有非整数主键的多态引用吗？

发布于 10-12 12:07 字数 564 浏览 9 评论 0原文

我有一个使用 UUID 作为主键的数据库，如下所示：

create_table "my_table", :id => false, :force => true do |t|
 t.string "id", :limit => 36
end

但是，当我尝试使用 :references 作为该表的外键时，它会生成 ID 的整数列。是否可以指示 :references 处理非整数 ID？我对引用表的迁移是这样的：

create_table "child_table" :id => false, :force => true do |t|
 t.string "id", :limit => 36
 t.references :my_table
end

我知道我可以手动创建 :my_table_id 和 :my_table_type 列，但我想知道 :references 是否 可以在这些情况下发挥其魔力，这样我就不必在整个代码中显式处理 id+type 了。

原文

I have a database that uses UUIDs as primary keys, like this:

create_table "my_table", :id => false, :force => true do |t|
 t.string "id", :limit => 36
end

However, when I try to use :references for foreign keys to that table, it generates integer columns for the ID. Can :references be instructed to deal with a non-integer ID? My migration for the referring table is like this:

create_table "child_table" :id => false, :force => true do |t|
 t.string "id", :limit => 36
 t.references :my_table
end

I know that I could just manually create :my_table_id and :my_table_type columns, but I'm wondering whether :references can be made to do its magic under these circumstances so that I don't have to handle the id+type explicitly throughout my code.

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顾忌2024-10-19 12:07:37

从 Rails 4.2 开始，引用时添加了 :type 选项

t.references :car, type: :uuid, index: true

例如：

def change
  enable_extension 'uuid-ossp'
  create_table :cars, id: :uuid do |t|
    t.integer :seats
    # And other car-specific things
  end
  create_table :wheels do |t|
    t.references :car, type: :uuid, index: true
    t.integer :radius
    # And other wheel-specific things
  end
end

source: https://github.com/rails/rails /拉/16231

A :type option has been added when referencing since Rails 4.2

t.references :car, type: :uuid, index: true

For example:

def change
  enable_extension 'uuid-ossp'
  create_table :cars, id: :uuid do |t|
    t.integer :seats
    # And other car-specific things
  end
  create_table :wheels do |t|
    t.references :car, type: :uuid, index: true
    t.integer :radius
    # And other wheel-specific things
  end
end

source: https://github.com/rails/rails/pull/16231

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