[英]Cross model update in ASP.NET Core
I'm really new to ASP.NET Core so I apologize if this is a silly question, but I've spent so many hours trying to figure this out.我对 ASP.NET Core 真的很陌生,所以如果这是一个愚蠢的问题,我深表歉意,但我花了很多时间试图解决这个问题。
I have 2 models, Teacher
and Student
.我有 2 个模型,
Teacher
和Student
。 The relationship is one teacher to many students.这种关系是一位老师与许多学生的关系。 This is a backend API project and Im working on a PUT method which can update fields in both models simultaneously in one request.
这是一个后端 API 项目,我正在研究一种 PUT 方法,该方法可以在一个请求中同时更新两个模型中的字段。
Here's my Teacher
class:这是我的
Teacher
课:
public partial class Teacher
{
public Teacher()
{
Students = new HashSet<Student>();
}
public int TeacherId { get; set; }
public string Name { get; set; }
... tons of other properties ...
}
Here's my Student
class:这是我的
Student
类:
public partial class Student
{
public int Id { get; set; }
public int TeacherId { get; set; }
public string Name { get; set; }
public virtual Teacher Teacher { get; set; }
}
Here's the controller:这是控制器:
[HttpPut("{id}")]
public async Task<IActionResult> PutTeachers(int id, TeacherViewModel model)
{
var result = await _service.UpdateAsync(model);
return Ok(result.Message);
}
(The code above is simplified) - It takes in a TeacherViewModel
which restricts the number of fields to be returned - I used another class as a service to do the update (上面的代码是简化的) - 它采用了一个
TeacherViewModel
,它限制了要返回的字段数 - 我使用另一个类作为服务来进行更新
Here's the service class:这是服务类:
public class TeacherService
{
private readonly Repository<Teacher> _repository;
public TeacherService(DatabaseContextWrapper context)
{
_repository = new Repository<Teacher>(context);
}
public async Task<ITransactionResult> UpdateAsync(TeacherViewModel model)
{
var teacher = _repository.FindAsync(model.TeacherId).Result;
teacher.TeacherId = model.TeacherId;
teacher.Name = model.Name;
teacher.Students.Clear();
foreach(var student in model.Students)
{
teacher.Students
.Add(new Student
{
Id = Student.Id,
TeacherId = Student.TeacherId
Name = Student.Name
});```
}
}
}
My reasoning is to add the Student
model to the to students under the Teacher
model but it doesn't iterate through.我的推理是将
Student
模型添加到Teacher
模型下的学生,但它不会迭代。 If I comment out the clear code, the update will work but it won't cross update.如果我注释掉清晰的代码,更新将起作用,但不会交叉更新。 It just simply wont iterate through.
它只是不会迭代。 I guess I'm pretty lost at this point.
我想我在这一点上很迷茫。 Any help would be appreciated!
任何帮助,将不胜感激!
Edit 1 (Entity relationship configuration)编辑 1(实体关系配置)
modelBuilder.Entity<Student>(entity => {
entity.HasOne(d => d.Teacher)
.WithMany(p => p.Students)
.HasForeignKey(d => d.TeacherId)
.OnDelete(DeleteBehavior.ClientSetNull)
.HasConstraintName("FK_Students_Teachers");
});
This is my configuration这是我的配置
Try adding the reverse config to your parents entity:尝试将反向配置添加到您的父实体:
modelBuilder.Entity<Teacher>(entity =>
{
entity.HasMany(d => d.Students)
.WithOne(p => p.Teacher)
.HasForeignKey(d => d.TeacherId);
});
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