选择级联删除的参考或在删除

In Rails 4.2, when creating a table or adding a reference via references or add_reference how do you specify that the foreign key should cascade on delete.

在Rails 4.2中，当创建一个表或通过引用或add_reference添加引用时，您如何指定外键应该在删除时级联。

Command to generate scaffold:

命令生成脚手架:

rails g scaffold Child parent:references name:string

Resulting migration:

导致的迁移:

create_table :childs do |t|
  t.references :parent, index: true, foreign_key: true
  t.string :name

  t.timestamps null: false
end

1 个解决方案

#1

This should work

这应该工作

create_table :childs do |t|
  t.references :parent, index: true, foreign_key: {on_delete: :cascade}
  t.string :name

  t.timestamps null: false
end

According to ActiveRecord::ConnectionAdapters::TableDefinition#references, if a hash is specified on the foreign_key option, it is directly passed down into the foreign_key method.

根据ActiveRecord:: connectionadapter::TableDefinition#引用，如果在foreign_key选项中指定了一个散列，它将直接传递给foreign_key方法。

source:

来源:

foreign_key(col.to_s.pluralize, foreign_key_options.is_a?(Hash) ? foreign_key_options : {}) if foreign_key_options

#1