我有一个用户实体，它有一个userRoles数组作为数据成员。用户存储在数据库中名为users的表中，user_roles存储在名为user_role_mapping的表中。我想与typeorm建立一对多关系，这样当我在数据库中保存用户时，它也会在相应的表中保存相应的userRoles。我还没能让它发挥作用。
这是我的用户实体

@Entity("users",{schema:"Cellphones" } )
@Index("net_id",["netId",],{unique:true})
export class User {

    @PrimaryGeneratedColumn({
        type:"int", 
        name:"id"
        })
    id: number;

    @Column("varchar",{ 
        nullable:false,
        unique: true,
        length:20,
        name:"net_id"
        })
    netId: string;

    @Column("varchar",{ 
        nullable:true,
        length:20,
        name:"employee_id"
        })
    employeeId: string | null;

    @Column("varchar",{ 
        nullable:false,
        length:50,
        name:"first_name"
        })
    firstName: string;

    @Column("varchar",{ 
        nullable:false,
        length:50,
        name:"last_name"
        })
    lastName: string;

    @Column("varchar",{ 
        nullable:true,
        length:50,
        name:"title"
        })
    title: string | null;

    @Column("tinyint",{ 
        nullable:false,
        width:1,
        name:"active"
        })
    active: boolean;

    @Column("varchar",{ 
        nullable:true,
        length:100,
        name:"email"
        })
    email: string | null;

    @Column("varchar",{ 
        nullable:true,
        length:20,
        name:"phone"
        })
    phone: string | null;

    @Column("date",{ 
        nullable:true,
        name:"term_date"
        })
    termDate: Date | null;

    @Column("varchar",{ 
        nullable:true,
        length:10,
        name:"term_department"
        })
    termDepartment:string | null;

    @Column("date",{ 
        nullable:true,
        name:"retire_date"
        })
    retireDate: Date | null;

    @Column("date",{ 
        nullable:false,
        name:"last_login"
        })
    lastLogin: Date;

    @Column("varchar",{ 
        nullable:false,
        length:50,
        name:"employee_status"
        })
    employeeStatus:string;

    @Column("varchar",{ 
        nullable:false,
        length:50,
        name:"department"
        })
    department:string;

    @Column("varchar",{ 
        nullable:true,
        length:10,
        name:"pay_group"
        })
    payGroup:string | null;

    @Column("datetime",{ 
        nullable:true,
        name:"updated"
        })
    updated:Date | null;

    @Column("int",{ 
        nullable:true,
        name:"updated_by"
        })
    updatedBy:number | null;

    @Column("date",{ 
        nullable:true,
        name:"inactivated"
        })
    inactivated:Date | null;

    @Column("int",{ 
        nullable:true,
        name:"inactivated_by"
        })
    inactivatedBy:number | null;

    @OneToMany(type => UserRoleMapping, userRoleMapping => userRoleMapping.userId)
    userRoles: UserRoleMapping[];
}

这是我的UserRoleMapping实体：

@ManyToOne(type => User, user => user.userRoles)
@Entity("user_role_mapping",{schema:"Cellphones" } )
export class UserRoleMapping {

    constructor(id: number, userId: number, roleId: number) {}

    @PrimaryGeneratedColumn({
        type:"int",
        name:"id"
        })
    id: number;

    @Column({
        type:"int",
        name:"user_id"
        })
    userId: number;

    @Column({
        type:"int",
        name:"role_id"
        })
    roleId: number;
}

下面是users表的样子：

小时
下面是user_role_mapping表的样子：

小时
请注意，任何名称以old_开头的列仅用于数据迁移目的，与此项目无关。