Can not project int values from json column

Steps to reproduce

1. Create ef core model

public class SampleJson
{
    [JsonProperty("int_value")]
    public int IntValue { get; set; }
}

public class EntityWithJson
{
    [Key]
    [Column("id")]
    public int Id { get; set; }

    [Column("json", TypeName = "json")]
    public SampleJson Json { get; set; }
}

1. Configure DBContext

optionsBuilder.UseMySql(
    "{connection_string}",
    new MySqlServerVersion(new Version(5, 7, 26)),
    x => x.UseNewtonsoftJson(MySqlCommonJsonChangeTrackingOptions.FullHierarchyOptimizedSemantically));

1. Create projection and try get value from json column

class Projection
{
    public int Value { get; set; }

    public int JsonValue { get; set; }
}

var query = _dbContext.Entities
    .Select(x => new Projection
    {
        Value = x.Id,
        JsonValue = x.Json.IntValue
    });
await query.ToArrayAsync();

The issue

I see exception if i try get value from json

Exception message: Can't convert JSON to Int32
Stack trace:
at MySqlConnector.Core.Row.GetInt32(Int32 ordinal) in /_/src/MySqlConnector/Core/Row.cs:line 218
   at MySqlConnector.MySqlDataReader.GetInt32(Int32 ordinal) in /_/src/MySqlConnector/MySqlDataReader.cs:line 234
   at lambda_method62(Closure , QueryContext , DbDataReader , ResultContext , SingleQueryResultCoordinator )
   at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.AsyncEnumerator.MoveNextAsync()
   at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToArrayAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
   at MySqlJsonTest.Tests.Test1() in D:\source\MySqlJsonTest\MySqlJsonTest\UnitTest1.cs:line 39
   at NUnit.Framework.Internal.TaskAwaitAdapter.GenericAdapter`1.BlockUntilCompleted()
   at NUnit.Framework.Internal.MessagePumpStrategy.NoMessagePumpStrategy.WaitForCompletion(AwaitAdapter awaiter)
   at NUnit.Framework.Internal.AsyncToSyncAdapter.Await(Func`1 invoke)
   at NUnit.Framework.Internal.Commands.TestMethodCommand.RunTestMethod(TestExecutionContext context)
   at NUnit.Framework.Internal.Commands.TestMethodCommand.Execute(TestExecutionContext context)
   at NUnit.Framework.Internal.Commands.BeforeAndAfterTestCommand.<>c__DisplayClass1_0.<Execute>b__0()
   at NUnit.Framework.Internal.Commands.BeforeAndAfterTestCommand.RunTestMethodInThreadAbortSafeZone(TestExecutionContext context, Action action)

Further technical details

MySQL version: 8.0 Operating system: Windows 10 x64 Pomelo.EntityFrameworkCore.MySql version: 6.0.1 Microsoft.AspNetCore.App version: 6.0.4

[lauxjpn]

@denisenko93 Thanks for reporting! You can find the fix in our nightly builds.

[lauxjpn]

@denisenko93 I’ll test this shorty, but your model should just work, so if it doesn’t in this case, it might be a bug on our end that needs to be fixed.