Angular Web API$http文章排除列表

Question

我有一个Web API（2）项目，它有部门和员工。一个员工有一个部门，一个部门有一个员工列表。

现在，在前端，当创建或编辑员工时，用户必须选择一个部门。当将其发布到API时，部门包含员工列表（这会导致无效的模型状态），如何防止这种情况发生？

这是我的相关设置：

型号：

public class Employee : IEntity, ICreatedOn, IModifiedOn, IMappable
{
    [Key]
    public virtual int Id { get; set; }
    public virtual Department Department { get; set; }
    // .. other properties
}
public class Department : IEntity, IMappable
{
    [Key]
    public virtual int Id { get; set; }
    public virtual ICollection<Employee> Employees { get; set; }
    // .. other properties
}

Web API控制器：

public class EmployeesController : ApiController
{
    private readonly IEmployeeService _employeeService;
    public EmployeesController(IEmployeeService employeeService)
    {
        this._employeeService = employeeService;
    }
    // .. GET, POST, DELETE etc.
    // PUT: api/Employees/5
    [ResponseType(typeof(void))]
    public IHttpActionResult PutEmployee(int id, EmployeeVM employee)
    {
        // This is always invalid, because the employee has a department, which in turn has a list of employees which can be invalid
        // What to do to exclude the list of employees from validation, or even better prevent from being sent to the API
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }
        // Update etc..
        return StatusCode(HttpStatusCode.NoContent);
    }

Angular（DataService.js）:

app.factory('DataService',
    ["$http",
    function ($http) {
        return {
            // other functions
            updateEmployee: _updateEmployee
        }
        function _updateEmployee(employee) {
            // Maybe exclude the list of employees in employee.department in here??
            return $http.put(employeesUrl + "/" + employee.id, employee);
        }
        // .. other functions
    }]);

注：

• 它发生在Put和Post中（更新和创建）
• 我正在使用AutoMapper映射到ViewModels，它们看起来与实体相同
• 我正在为ORM使用实体框架

我尝试过的：

• Employees集合的[JsonIgnore]属性；这导致在加载部门时也不会加载员工
• 控制器操作参数中的[Bind（Exclude="Employees"）]属性，这没有任何效果
• [绑定（排除="部门.员工"）]相同

什么是有效的，但我相信一定有更好的解决方案：

function _updateEmployee(employee) {
    var newEmp = angular.copy(employee);
    delete newEmp.department.employees;
    return $http.put(employeesUrl, newEmp);
}

Answer 1

创建一个用于更新employee的新请求。类似：

public class UpdateEmployeeRequest{
     public int EmployeeId {get;set;}
     public int DepartmentId {get;set;}
     //and so on
}  

对于此请求，您可以指定具体的验证。

并使用显式ID声明实体：

public class Employee : IEntity, ICreatedOn, IModifiedOn, IMappable
{
    [Key]
    public int Id { get; set; }
    [ForeignKey( "Department" )]
    public Guid DepartmentId { get; set; }
    [Required]
    public virtual Department Department { get; set; }
    // .. other properties
}

Answer 2

我会像这个一样修改Employee实体

    public class Employee : IEntity, ICreatedOn, IModifiedOn, IMappable
    {
        [Key]
        public virtual int Id { get; set; }
        //Add DepartmentId
        public Guid? DepartmentId { get; set; }
        public virtual Department Department { get; set; }
        // .. other properties
    }

然后你只能设置DepartmentId，就这样了。EF将负责剩下的