Rails:'references:foo'和'integer:foo_id'之间有区别吗? [英] Rails: is there a difference between 'references :foo' and 'integer :foo_id'?

问题描述

当我在迁移中使用references :foo时，生成的列称为foo_id.实际上，执行references :foo和仅执行integer :foo_id有什么区别吗?也许是在后台执行某些事情以在数据库级别强制执行该关系?

When I use references :foo in a migration, the column that's generated is called foo_id. Is there actually any difference between doing references :foo and just doing integer :foo_id? Maybe something going on under the hood to enforce the relationship at the database level?

推荐答案

对于您的特定情况，结果是相同的；你是对的.但是references允许使用:polymorphic => true选项，该选项将自动在表中将foo_type列创建为字符串.

The result is the same for your specific case; you are correct. But references allows for a :polymorphic => true option which will automatically create the foo_type column as a string in the table.

从语义上讲，如果尝试使迁移更好地反映数据库中表之间的关系，则references会更好.

Semantically, references is better if you are trying make your migrations better reflect the relations between tables in the database.

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