Question

当我使用IdentityDbContext

时，我无法弄清楚如何让Breeze返回MetaData

我的上下文如下

    public partial class MyContext : IdentityDbContext<ApplicationUser, ApplicationRole, string>
        {
    public MyContext(DbContextOptions options) : base(options)
        {
        }
 protected override void OnModelCreating(ModelBuilder modelBuilder)
        {


    base.OnModelCreating(modelBuilder);
    modelBuilder.Entity<ApplicationUser>().HasMany(u => u.Claims).WithOne().HasForeignKey(c => c.UserId).IsRequired().OnDelete(DeleteBehavior.Cascade);
    modelBuilder.Entity<ApplicationUser>().HasMany(u => u.Roles).WithOne().HasForeignKey(r => r.UserId).IsRequired().OnDelete(DeleteBehavior.Cascade);

    modelBuilder.Entity<ApplicationRole>().HasMany(r => r.Claims).WithOne().HasForeignKey(c => c.RoleId).IsRequired().OnDelete(DeleteBehavior.Cascade);
    modelBuilder.Entity<ApplicationRole>().HasMany(r => r.Users).WithOne().HasForeignKey(r => r.RoleId).IsRequired().OnDelete(DeleteBehavior.Cascade);

        }

        }

在我的ConfigureServices中：

// add identity
   services.AddIdentity<ApplicationUser, ApplicationRole>()
            .AddEntityFrameworkStores<MyContext>()
            .AddDefaultTokenProviders();

我的默认控制器是：

 [Route("breeze/[action]")]
[BreezeQueryFilter]
public class DefaultController : Controller
{
    private readonly NyContext _context;
    private readonly UnitOfWork _unitOfWork;
    private readonly MyPersistenceManager _persistenceManager;

    // called via DI 
    public DefaultController(MyContext context)
    {
        _context = context;
        _unitOfWork = new UnitOfWork(context);
        _persistenceManager = new MyPersistenceManager(context);
    }

    [HttpGet]
    public IActionResult Metadata()
    {
        return Ok(_persistenceManager.Metadata());
    }

    [HttpPost]
    public SaveResult SaveChanges([FromBody] JObject saveBundle)
    {
        return _unitOfWork.Commit(saveBundle);
    }
}

当我像这样执行和测试时：

http://localhost:3333/Breeze/MetaData

我收到以下错误：

{“$ id”：“1”，“$ type”：“Breeze.AspNetCore.ErrorDto，Breeze.AspNetCore.NetCore”，“Code”：0，“Message”：“对象引用未设置为实例一个对象。“，”StackTrace“：”在C：\ git \ Breeze \ breeze.server.net \ AspNetCore \ Breeze.Persistence.EFCore \ MetadataBuilder.cs中的Breeze.Persistence.EFCore.MetadataBuilder.BuildAssocName（INavigation prop）：第138行\ r \ n在Breeze.Persistence.EFCore.MetadataBuilder.CreateNavProperty（INAVigation p）在C：\ git \ Breeze \ breeze.server.net \ AspNetCore \ Breeze.Persistence.EFCore \ MetadataBuilder.cs：第128行\ r \ n at System.Linq.Enumerable.WhereSelectEnumerableIterator 2.ToList()\r\n at System.Linq.Enumerable.ToList[TSource](IEnumerable 1 source）\ r \ n at Breeze.Persistence.EFCore.MetadataBuilder.CreateMetaType（IEntityType et，Dictionary 2 dbSetMap) in C:\\git\\Breeze\\breeze.server.net\\AspNetCore\\Breeze.Persistence.EFCore\\MetadataBuilder.cs:line 89\r\n at System.Linq.Enumerable.WhereSelectEnumerableIterator 2.ToList（）\ r \ n \ n在System.Linq.Enumerable.ToList [TSource]（IEnumerable 1 source)\r\n at Breeze.Persistence.EFCore.MetadataBuilder.GetMetadataFromContext(DbContext dbContext) in C:\\git\\Breeze\\breeze.server.net\\AspNetCore\\Breeze.Persistence.EFCore\\MetadataBuilder.cs:line 21\r\n at Breeze.Persistence.EFCore.EFPersistenceManager 1.BuildJsonMetadata（）在C：\ git \ Breeze \ breeze.server.net \ AspNetCore \ Breeze.Persistence.EFCore \ EFPersistenceManager.cs ：第109行\ r \ n在Breeze.Persistence.PersistenceManager.Metadata（）在C：\ git \ Breeze \ breeze.server.net \ AspNetCore \ Breeze.Persistence \ PersistenceManager.cs：第34行\ r \ n在C：\ Users \ MrTou \ Documents \ Visual Studio 2017 \ Projects \ Dictionary Project \ DP Server \ DictionaryPortalServer \中的DictionaryPortalServer.Controllers.DefaultController.Metadata（） Controllers \ DefaultController.cs：第32行\ r \ n在lambda_method（Closure，Object，Object []）\ r \ n在Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute（Object target，Object [] parameters）\ r \ n在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d__12.MoveNext（）\ r \ n ---从抛出异常的上一个位置的堆栈跟踪结束--- \ r \ n在System.Runtime.ExceptionServices.ExceptionDispatchInfo。抛出（）\ r \ n在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）\ r \ n在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d__10.MoveNext（）\ r \ n ---结束从抛出异常的先前位置堆栈跟踪--- \ r \ n在System.Runtime.ExceptionServices.ExceptionDispat Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next（State＆amp;）中的Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow（ActionExecutedContext context）\ r \ n的chInfo.Throw（）\ r \ n接下来，范围＆amp;范围，对象＆amp; state，Boolean＆amp; isCompleted）\ r \ n在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d__14.MoveNext（）\ r \ n ---从抛出异常的上一个位置的堆栈跟踪结束--- \ r \ n在System。 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）\ r \ n在Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.d__23.MoveNext()“，”中的Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）\ r \ n EntityErrors“：空}

我知道我的上下文正在运行，因为如果我使用另一个控制器来获取这样的数据：

http://localhost:3333/breeze/Summary/CartOrders

我收回了数据。只有当我尝试获取MetaData时才会出现错误。

似乎Breeze无法生成MetaData因为

ApplicationUser和ApplicationRole

有人能指出我正确的方向吗？

谢谢！

将IdentityDbContext与BreezeJS AspNetCore一起使用

0 个答案: