问有关系的‘Model`类是什么样子的？

EN

import Vapor
import Fluent
import Foundation

final class Store: Model {

    // MARK: - Model
    var id: Node?
    var exists: Bool = false
    var locationIDs: [Node] = [] // No idea if this is right

    var name: String

    init(name: String, locationIDs: [Node] = []) {
        self.id = nil
        self.name = name
        self.locationIDs = locationIDs
    }

    init(node: Node, in context: Context) throws {
        id = try node.extract("id")
        name = try node.extract("name")
//      ???
    }

    func makeNode(context: Context) throws -> Node {
        return try Node(node: [
            "id": id,
            "name": name
//          ???
        ])
    }

    static func prepare(_ database: Database) throws {
        try database.create( "stores" ) { creator in
            creator.id()
            creator.string("name")
//            creator.id("", optional: false) // ???
        }
    }

    static func revert(_ database: Database) throws {
        try database.delete("stores")
    }

}