[英]EF Core Insert in many to many table
我用Razor Pages搭建了User模型,在創建頁面上我想在聯結表UserRoles上插入用戶角色。
這是我的模特
[Table("Users")]
public class User
{
public User()
{
IsActivo = true;
}
public int Id { get; set; }
[Required]
[Display(Prompt = "Username")]
public string Username { get; set; }
[Display(Name = "Último Acesso")]
public DateTime? DataSessao { get; set; }
[Display(Name = "Activo")]
public bool IsActivo { get; set; }
public Colaborador Colaborador { get; set; }
public ICollection<UserRoles> UserRoles { get; set; }
}
這是創建模型
public class CreateModel : PageModel
{
private readonly HutIS.Models.HutISContext _context;
public CreateModel(HutISContext context)
{
_context = context;
}
public IActionResult OnGet()
{
DepartamentosOptions = _context.Departamento.Select(d =>
new SelectListItem
{
Value = d.Id.ToString(),
Text = d.Nome
}).ToList();
RolesOptions = _context.Roles.Select(d =>
new SelectListItem
{
Value = d.Id.ToString(),
Text = d.Type
}).ToList();
return Page();
}
[BindProperty]
public User User { get; set; }
public List<SelectListItem> DepartamentosOptions { get; set; }
public List<SelectListItem> RolesOptions { get; set; }
public async Task<IActionResult> OnPostAsync()
{
if (!ModelState.IsValid)
{
return Page();
}
_context.User.Add(User);
await _context.SaveChangesAsync();
return RedirectToPage("./Index");
}
}
在html上
<div class="form-group">
<label asp-for="User.UserRoles" class="control-label"></label>
<select asp-for="User.UserRoles" asp-items="Model.RolesOptions" class="form-control form-control-sm">
<option value="">Selecione um Departamento...</option>
</select>
<span asp-validation-for="User.UserRoles" class="text-danger"></span>
</div>
我不確定我該怎么做,當然我會在這里遇到異常,但是如果UserRoles是User中的一個集合,該如何綁定UserRoles呢?
編輯
我解決了異常問題,它與模型屬性有關。 現在的問題是,沒有在UserRoles表上插入任何內容,我不太確定該怎么做,因為與部門相比,User的UserRoles沒有導航屬性。
如您所見,關系是正確的
對於<select multiple="multiple" asp-for="User.RoleIds" asp-items="Model.RolesOptions" class="form-control form-control-sm">
,它將提交RoleId值而不是Role Object ,則需要定義public ICollection<int> UserRoleIds { get; set; }
public ICollection<int> UserRoleIds { get; set; }
public ICollection<int> UserRoleIds { get; set; }
接受RoleIds。
請按照以下步驟操作:
使用UserRoleIds
定義ViewModel
public class UserVM { public UserVM() { IsActivo = true; } public int Id { get; set; } [Required] [Display(Prompt = "Username")] public string Username { get; set; } [Display(Name = "Último Acesso")] public DateTime? DataSessao { get; set; } [Display(Name = "Activo")] public bool IsActivo { get; set; } public ICollection<int> RoleIds { get; set; } }
剃刀型號
public class CreateModel : PageModel { private readonly TestRazorContext _context; public CreateModel(TestRazorContext context) { _context = context; } public IActionResult OnGet() { RolesOptions = _context.Role.Select(d => new SelectListItem { Value = d.Id.ToString(), Text = d.Type }).ToList(); return Page(); } [BindProperty] public UserVM User { get; set; } public List<SelectListItem> RolesOptions { get; set; } public async Task<IActionResult> OnPostAsync() { if (!ModelState.IsValid) { return Page(); } //create user var user = new User { Username = User.Username, //rest properties }; _context.User.Add(user); await _context.SaveChangesAsync(); //set user role var userRoles = new List<UserRoles>(); foreach (var roleId in User.RoleIds) { userRoles.Add(new UserRoles { UserId = user.Id, RoleId = roleId }); } _context.UserRole.AddRange(userRoles); await _context.SaveChangesAsync(); return RedirectToPage("./Index"); } }
剃刀視圖
<form method="post"> <div class="form-group"> <label asp-for="User.Username" class="control-label"></label> <input asp-for="User.Username" /> </div> <div class="form-group"> <label asp-for="User.RoleIds" class="control-label"></label> <select multiple="multiple" asp-for="User.RoleIds" asp-items="Model.RolesOptions" class="form-control form-control-sm"> <option value="">Selecione um Departamento...</option> </select> <span asp-validation-for="User.RoleIds" class="text-danger"></span> </div> <input type="submit" value="Submit"/> </form>
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