Entity framework core 对其他模型上的多个导航属性重用外键

这是一个交叉张贴

---

在此之前，我一直在尝试使用现有的模式，并从中创建一些有用的导航属性。不幸的是，我在很多方面都遇到了挫折，尽管我觉得我能得到的最接近的东西是通过以下途径：

公共类权利
{
公共Guid Id{get；set；}
公共Guid可授权ID{get；set；}
}
公屋租户
{
公共Guid Id{get；set；}
公共ICollection AssignedTitlements{get；set；}
}
//注意：在这个例子中考虑用户和公司与租户相同。

/。。。
建模者
.实体（）
.HasMany（（租户）=>tenant.assignedTitlements）
.WithOne（）
.IsRequired（正确）
.HasForeignKey（（授权）=>授权.授权ID）
.HasPrincipalKey（（租户）=>tenant.Id）；
建模者
.实体（）
.HasMany（（公司）=>公司转让要素）
.WithOne（）
.IsRequired（正确）
.HasForeignKey（（授权）=>授权.授权ID）
.HasPrincipalKey（（firm）=>firm.Id）；
建模者
.实体（）
.HasMany（（用户）=>user.assignedTitlements）
.WithOne（）
.IsRequired（正确）
.HasForeignKey（（授权）=>授权.授权ID）
.HasPrincipalKey（（用户）=>user.Id）；
// ...

使用以下内容时，我似乎无法检索任何内容：

dbContext.Tenants.Include（（t）=>t.assignedTitlements）；

实体框架生成有效的查询（

.ToQueryString（）

）：

运行生成的SQL将返回正确的数据，但对查询对象运行

.First（）、FirstOrDefault（）等的任何尝试都可能导致以下问题：

System.InvalidOperationException: Sequence contains no matching element
   at System.Linq.ThrowHelper.ThrowNoMatchException()
   at System.Linq.Enumerable.First[TSource](IEnumerable`1 source, Func`2 predicate)
   at MyProject.Conventions.Feature..ctor(String name)
   at lambda_method374(Closure , QueryContext , DbDataReader , ResultContext , SingleQueryResultCoordinator )
   at Microsoft.EntityFrameworkCore.Query.RelationalShapedQueryCompilingExpressionVisitor.ShaperProcessingExpressionVisitor.<PopulateIncludeCollection>g__ProcessCurrentElementRow|60_0[TIncludingEntity,TIncludedEntity](<>c__DisplayClass60_0`2& )
   at Microsoft.EntityFrameworkCore.Query.RelationalShapedQueryCompilingExpressionVisitor.ShaperProcessingExpressionVisitor.PopulateIncludeCollection[TIncludingEntity,TIncludedEntity](Int32 collectionId, QueryContext queryContext, DbDataReader dbDataReader, SingleQueryResultCoordinator resultCoordinator, Func`3 parentIdentifier, Func`3 outerIdentifier, Func`3 selfIdentifier, IReadOnlyList`1 parentIdentifierValueComparers, IReadOnlyList`1 outerIdentifierValueComparers, IReadOnlyList`1 selfIdentifierValueComparers, Func`5 innerShaper, INavigationBase inverseNavigation, Action`2 fixup, Boolean trackingQuery)
   at lambda_method376(Closure , QueryContext , DbDataReader , ResultContext , SingleQueryResultCoordinator )
   at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.Enumerator.MoveNext()
   at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
   at lambda_method377(Closure , QueryContext )
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query)
   at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression)
   at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
   at MyProject.Global.Api.Controller.TestController.Test(MyProjectGlobalContext context) in /home/me/Development/MyProject/global/MyProject.Global.Api/src/Controller/TestController.cs:line 19
   at lambda_method289(Closure , Object )
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Logged|12_1(ControllerActionInvoker invoker)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.Policy.AuthorizationMiddlewareResultHandler.HandleAsync(RequestDelegate next, HttpContext context, AuthorizationPolicy policy, PolicyAuthorizationResult authorizeResult)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)


System.InvalidOperationException:序列不包含匹配元素
在System.Linq.ThrowHelper.ThrowNoMatchException（）中
在System.Linq.Enumerable.First[TSource]（IEnumerable`1源，Func`2谓词）
在MyProject.Conventions.Feature..ctor（字符串名）
在lambda_方法374（闭包、QueryContext、DbDataReader、ResultContext、SingleQueryResultCoordinator）
在Microsoft.EntityFrameworkCore.Query.RelationalShapedQueryCompilingExpressionVisitor.ShaperProcessingExpressionVisitor.g_uProcessCurrentElementRow | 60_0[TIncludingEntity，TIncludedEntity]（c_uDisplayClass60_0`2&）
位于Microsoft.EntityFrameworkCore.Query.RelationalShapedQueryCompilingExpressionVisitor.ShaperProcessingExpressionVisitor.PopulateIncludeCollection[TIncludingEntity，TIncludedEntity]（Int32 collectionId、QueryContext QueryContext、DbDataReader DbDataReader、SingleQueryResultCoordinator结果协调器、Func`3 parentIdentifier、Func`3 outerIdentifier、Func`3 selfIdentifier、IradonList`1 parentIdentifierValueComparers、IradonList`1 outerIdentifierValueComparers、IradonList`1 selfIdentifierValueComparers、Func`5 Inner）haper，INavigationBase inverseNavigation，Action`2 fixup，布尔跟踪查询）
在lambda_方法376（闭包、QueryContext、DbDataReader、ResultContext、SingleQueryResultCoordinator）
在Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryEnumerable`1.Enumerator.MoveNext（）中
在System.Linq.Enumerable.SingleOrDefault[TSource]（IEnumerable`1 source）处
在lambda_方法377（闭包，查询上下文）
在Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult]（表达式查询）中
在Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult]（表达式）中
位于System.Linq.Queryable.FirstOrDefault[TSource]（IQueryable`1源）
在/home/me/Development/MyProject/Global/MyProject.Global.Api.Controller.Test（MyProjectGlobalContext上下文）中的MyProject.Global.Api/src/Controller/TestController.cs：第19行
lambda_方法289（闭包，对象）
位于Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfActionResultExecutor.Execute（IActionResultTypeMapper映射器、ObjectMethodExecutor执行器、对象控制器、对象[]参数）
在Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g|u记录| 12_1（ControllerActionInvoker invoker invoker）
在Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g_u等待| 10_0（ControllerActionInvoker invoker，Task lastTask，State next，Scope Scope，Object State，Boolean isCompleted）
位于Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow（ActionExecutedContextSealed上下文）
位于Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next（状态和下一步、范围和范围、对象和状态、布尔值和isCompleted）
在Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync（）中
---上一个位置的堆栈结束跟踪---
在Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g_|19_0（ResourceInvoker invoker、Task lastTask、State next、Scope Scope、Object State、Boolean isCompleted）
在Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g|u记录| 17|u 1（ResourceInvoker invoker）
位于Microsoft.AspNetCore.Routing.EndpointMiddleware.g_uwaitRequestTask | 6_0（端点、任务请求任务、ILogger记录器）
位于Microsoft.AspNetCore.Authorization.Policy.AuthorizationMiddlewareResultHandler.HandleAsync（RequestDelegate下一步，HttpContext上下文，AuthorizationPolicy策略，PolicyAuthorizationResult authorizationResult）
位于Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke（HttpContext上下文）
在Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke（HttpContext上下文）中
位于Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke（HttpContext上下文）
看起来像你的同事
System.InvalidOperationException: Sequence contains no matching element
   at System.Linq.ThrowHelper.ThrowNoMatchException()
   at System.Linq.Enumerable.First[TSource](IEnumerable`1 source, Func`2 predicate)
   at MyProject.Conventions.Feature..ctor(String name)
   at lambda_method374(Closure , QueryContext , DbDataReader , ResultContext , SingleQueryResultCoordinator )
   at Microsoft.EntityFrameworkCore.Query.RelationalShapedQueryCompilingExpressionVisitor.ShaperProcessingExpressionVisitor.<PopulateIncludeCollection>g__ProcessCurrentElementRow|60_0[TIncludingEntity,TIncludedEntity](<>c__DisplayClass60_0`2& )
   at Microsoft.EntityFrameworkCore.Query.RelationalShapedQueryCompilingExpressionVisitor.ShaperProcessingExpressionVisitor.PopulateIncludeCollection[TIncludingEntity,TIncludedEntity](Int32 collectionId, QueryContext queryContext, DbDataReader dbDataReader, SingleQueryResultCoordinator resultCoordinator, Func`3 parentIdentifier, Func`3 outerIdentifier, Func`3 selfIdentifier, IReadOnlyList`1 parentIdentifierValueComparers, IReadOnlyList`1 outerIdentifierValueComparers, IReadOnlyList`1 selfIdentifierValueComparers, Func`5 innerShaper, INavigationBase inverseNavigation, Action`2 fixup, Boolean trackingQuery)
   at lambda_method376(Closure , QueryContext , DbDataReader , ResultContext , SingleQueryResultCoordinator )
   at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.Enumerator.MoveNext()
   at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
   at lambda_method377(Closure , QueryContext )
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query)
   at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression)
   at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
   at MyProject.Global.Api.Controller.TestController.Test(MyProjectGlobalContext context) in /home/me/Development/MyProject/global/MyProject.Global.Api/src/Controller/TestController.cs:line 19
   at lambda_method289(Closure , Object )
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Logged|12_1(ControllerActionInvoker invoker)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.Policy.AuthorizationMiddlewareResultHandler.HandleAsync(RequestDelegate next, HttpContext context, AuthorizationPolicy policy, PolicyAuthorizationResult authorizeResult)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)