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[Feature Request] a foreign constraint attribute for scalar fields not implying a relation mapping

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还没有人认领这个 Issue。

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Issue 类型
功能
描述清晰度
基本清楚
活跃度
冷清
技术栈
typescript
领域
database

调研方向

Language-design request for the ZModel schema DSL: a new @foreign attribute must be threaded from attribute declaration through schema validation to generated migration DDL. No file or test is named, so start where built-in attributes like @relation are declared, parsed and validated, then follow migration generation. Open semantic question: SQL foreign keys require a unique referenced column, so references: [kind] needs a design decision; done means the schema compiles and the migration emits the constraint.

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描述

Problem

model ModelA {
 id Int,
 name String
 bKind String        //should matches a value that exists in ModelB.kind
}

model ModelB {
 id Int,
 name String
 kind String  //this is not unique and can't identify a single ModelB row
}

Unfortunately, AFAIK the only current way of describing a FK is through a @relation attribute that enforce matching an unique and effective object, that should be present in the linked model.
That's not ideal when one just want to ensure scalars consistency from the described zmodel.

Proposal
A new @foreign attribute allowing to describe a simple FK constraint would be nice
i.e:

model TableA {
 id Int,
 name String
 bKind String       @foreign(fields:[bKind], references:[kind], from: ModelB)
}

Describe alternatives you've considered
Adding custom SQL to create the FK in a migration. But, IMHO, the ORM model should allow describing simple FK and abstract their creation.

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TypeScript
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