使用Entity Core创建一个简单的restful Web API.我遇到的问题是,当使用简单的context.Users.ToListAsync()查询时,我收到数据库中所有用户的列表,但是,当加载一对一关系导航属性时(context.Users.Include( u => u.Status).ToListAsync(),我总是只收到我数据库中的第一项.
以下是我的Code First型号：
public class User
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string FullName { get { return LastName + "," + FirstName; } }
public string Email { get; set; }
public string Avatar { get; set; }
public string GUID { get; set; }
public string InternalId { get; set; }
// Foreign keys and navigation properties
public virtual UserStatus Status { get; set; }
}
public class UserStatus
{
public int Id { get; set; }
public string Name { get; set; }
// Foreign keys and navigation properties
public virtual List<User> Users { get; set; }
}
每个用户必须具有用户状态.用户状态应该是可能状态状态的表.将有许多用户具有单一状态类型.这是我流利的映射：
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
// Users
modelBuilder.Entity<User>()
.HasAlternateKey(p => p.GUID);
modelBuilder.Entity<User>()
.HasAlternateKey(p => p.InternalId);
modelBuilder.Entity<User>()
.HasAlternateKey(p => p.Email);
modelBuilder.Entity<User>()
.Property(p => p.FirstName)
.HasMaxLength(40)
.Isrequired();
modelBuilder.Entity<User>()
.Property(p => p.LastName)
.HasMaxLength(40)
.Isrequired();
modelBuilder.Entity<User>()
.Property(p => p.Email)
.HasMaxLength(250)
.Isrequired();
modelBuilder.Entity<User>()
.HasOne(p => p.Status)
.WithMany(s => s.Users)
.HasForeignKey("StatusId")
.OnDelete(Microsoft.EntityFrameworkCore.Metadata.DeleteBehavior.Restrict);
// User Status
modelBuilder.Entity<UserStatus>()
.Property(s => s.Name)
.HasMaxLength(40)
.Isrequired();
}
这是我正在测试的简单数据初始化：
List<UserStatus> status = new List<UserStatus>();
status.Add(new UserStatus { Name = "Invited" });
status.Add(new UserStatus { Name = "Registered" });
status.Add(new UserStatus { Name = "Verified" });
status.Add(new UserStatus { Name = "Deactivated" });
foreach (UserStatus s in status)
{
context.UserStatus.Add(s);
}
context.SaveChanges();
List<User> users = new List<Users>();
users.Add(new User {
FirstName = "Jack",LastName = "Test",Email = "[email protected]",GUID = "TEST001",InternalId = "00001",Status = status[0]
});
users.Add(new User
{
FirstName = "Jane",LastName = "Tester",Email = "[email protected]",GUID = "TEST002",InternalId = "00002",Status = status[1]
});
foreach (User u in users)
{
context.Users.Add(u);
}
context.SaveChanges();
在我的web API控件中,纯粹用于测试,我正在执行以下操作：
[HttpGet]
public async Task<IActionResult> Get()
{
var users = await context.Users
.ToListAsync();
return new OkObjectResult(users);
}
[HttpGet]
public async Task<IActionResult> Get()
{
var users = await context.Users
.Include(u => u.Status)
.ToListAsync();
return new OkObjectResult(users);
}
[HttpGet]
public async Task<IActionResult> Get()
{
var users = await context.Users
.Include(u => u.Status)
.LastAsync();
return new OkObjectResult(users);
}
而不是第一个条目,我得到了最后一个,这意味着我可以使用整个列表,至少直到ToListAsync调用.
有人能告诉我我做错了什么吗？一对一关系是否设置错误？ ym数据初始化？我无法想出这个.
非常感谢你的时间！
解决方法
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