Cannot create new item in collection

[CoLdAs1cE]

when i try to post this item

{
	"Id": "1234",
	"Comments": "this is a comment"
}

/// this is somewhat simplified code //

model

public class Test
{
	public string Id { get; set; } // is partition key
	public string Comments { get; set; }
}

modelbuilder

entity.HasNoDiscriminator();
entity.HasKey(p => p.Id).HasName("id");
entity.HasPartitionKey(p => p.Id);

controller

[ProducesResponseType(StatusCodes.Status200OK)]
[HttpPost]
[Route("Test")]
public async Task<IActionResult> PostTest([FromBody] Domain.Stempleboks model)
{
	await Context.Stemplebokser.AddAsync(model);
	await Context.SaveChangesAsync();

	return Ok(model);
}

///
removed locations and names

System.ArgumentOutOfRangeException: StartIndex cannot be less than zero. (Parameter 'startIndex')
   at System.Text.StringBuilder.Remove(Int32 startIndex, Int32 length)
   at Microsoft.EntityFrameworkCore.Cosmos.ValueGeneration.Internal.IdValueGenerator.NextValue(EntityEntry entry)
   at Microsoft.EntityFrameworkCore.ValueGeneration.ValueGenerator.NextValueAsync(EntityEntry entry, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.ValueGeneration.ValueGenerator.NextAsync(EntityEntry entry, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.ValueGenerationManager.GenerateAsync(InternalEntityEntry entry, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.InternalEntityEntry.SetEntityStateAsync(EntityState entityState, Boolean acceptChanges, Boolean modifyProperties, Nullable`1 forceStateWhenUnknownKey, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityGraphAttacher.PaintActionAsync(EntityEntryGraphNode`1 node, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityEntryGraphIterator.TraverseGraphAsync[TState](EntityEntryGraphNode`1 node, Func`3 handleNode, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.DbContext.AddAsync[TEntity](TEntity entity, CancellationToken cancellationToken)
   at function(var OBJ) in code.cs:line 24
   at Controller.function(var model) in code.cs:line 57
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   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 where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ExceptionContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)

---

Document Details

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• ID: 738deb7b-d752-f628-3860-fe53891cadb0
• Version Independent ID: e0a18db9-d605-2a78-b77a-d22375dcfd4e
• Content: Azure Cosmos DB Provider - EF Core
• Content Source: entity-framework/core/providers/cosmos/index.md
• Product: entity-framework
• Technology: entity-framework-core
• GitHub Login: @AndriySvyryd
• Microsoft Alias: ansvyryd

[AndriySvyryd]

Duplicate of #21396