返回vapor4中的特定字段

import Vapor

// 定义模型
final class User: Model {
    static let schema = "users"
    
    @ID(key: .id)
    var id: UUID?
    
    @Field(key: "name")
    var name: String
    
    @Field(key: "email")
    var email: String
    
    init() {}
    
    init(id: UUID? = nil, name: String, email: String) {
        self.id = id
        self.name = name
        self.email = email
    }
}

// 创建路由
func routes(_ app: Application) throws {
    app.get("users") { req -> EventLoopFuture<[User]> in
        // 处理请求
        return User.query(on: req.db).all().map { users in
            // 返回特定字段
            return users.map { user in
                return User(id: user.id, name: user.name, email: user.email)
            }
        }
    }
}

// 启动应用程序
try app.run()