[英]stoping ef-core to insert referenced record in to master table
我有如下设置。
Supermaster
Master
有一个Master
的集合。 Master
参与Reference
PK Id的FK参考 Reference
表具有只读参考数据。 在ef代码中,当我从Supermaster
表加载记录时,我根据某些条件添加对每个Master
的reference
。
在提交Supermaster
我希望Supermaster
与所有Master
一起参考Reference
。
但是在dbContext.SaveChanges()
EF尝试将记录插入Reference
并且使用PK约束失败。
我到现在为止做了什么
我尝试使用Fluent API与外键创建一对一的关系。
我在保存上下文之前尝试过Detaching Entity
_context.Entry(programmingRecord.ProgrammingRecordParameters.Select(x=>x.ValidationRule)).State = EntityState.Detached;
。
这是代码。
实体
Public class Supermaster
{
public virtual ICollection<Master> ProgrammingRecordParameters { get; set; }
}
public class Reference
{
public int Id { get; set; }
public string Description { get; set; }
}
public class Master
{
public int Id { get; set; }
public string DataGroup { get; set; }
[ForeignKey("ValidationRuleId")]
public Reference ValidationRule { get; set; }
public int? ValidationRuleId { get; set; }
}
API
private void AddParameter(
Supermaster rec,
Master programmableParameter)
{
var param = new Master
{
DataGroup = programmableParameter.DataGroup,
ValidationRule = _context.References.FirstOrDefault(x=>x.Description==programmableParameter.DataGroup
};
rec.ProgrammingRecordParameters.Add(param);
}
public IActionResult PostProgrammingRecord([FromBody] Master programmingRecord)
{
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
var repo = new ProgrammingRepository(_context);
_context.ProgrammingRecords.Add(programmingRecord);
_context.SaveChanges();
}
以下是错误堆栈
HResult=0x80131500
Message=An error occurred while updating the entries. See the inner exception for details.
Source=Microsoft.EntityFrameworkCore.Relational
StackTrace:
at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection)
at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(DbContext _, ValueTuple`2 parameters)
at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(IEnumerable`1 commandBatches, IRelationalConnection connection)
at Microsoft.EntityFrameworkCore.Storage.RelationalDatabase.SaveChanges(IReadOnlyList`1 entries)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(IReadOnlyList`1 entriesToSave)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(Boolean acceptAllChangesOnSuccess)
at Microsoft.EntityFrameworkCore.DbContext.SaveChanges(Boolean acceptAllChangesOnSuccess)
at Microsoft.EntityFrameworkCore.DbContext.SaveChanges()
at RadioTMS.Web.Controllers.API.ProgrammingController.PostProgrammingRecord(ProgrammingRecord programmingRecord) in D:\TMS_Git_Repo\radio-tms\RadioTMS.Web\Controllers\API\ProgrammingController.cs:line 181
at Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute(Object target, Object[] parameters)
at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.SyncActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeActionMethodAsync>d__12.MoveNext()
Inner Exception 1:
SqlException: Cannot insert explicit value for identity column in table 'ValidationRules' when IDENTITY_INSERT is set to OFF.
EF正在尝试在引用表中插入记录,因为实体上下文没有加载引用数据。在调用保存更改之前,您应该获取在上下文中加载的引用记录。
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