Regression related to nested primitive collections in 10.0.0-rc.2

Heya, I've been testing our application with .NET/EFCore 10 RC2 and the corresponding Npgsql version, and noticed the following bug during startup for nested primitive collections that seems to have been introduced in the most recent version:

Unhandled exception. System.InvalidOperationException: The property 'List<List<string>> Model.Property' is a primitive collection of a primitive collection. Nested primitive collections are not yet supported with relational database providers.

I presume #3623 broke something here.

Minimal repro (works on 9.0.4 and 10.0.0-rc.1, but not on 10.0.0-rc.2):

using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;

await using var context = new BlogContext();
await context.Database.EnsureDeletedAsync();
await context.Database.EnsureCreatedAsync();

public class BlogContext : DbContext
{
	public DbSet<Foo> Foos { get; set; }

	protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
		=> optionsBuilder
		   .UseNpgsql("Host=localhost;Username=test;Password=test")
		   .LogTo(Console.WriteLine, LogLevel.Information)
		   .EnableSensitiveDataLogging();

	protected override void OnModelCreating(ModelBuilder modelBuilder)
	{
		modelBuilder.Entity<Foo>(b => b.Property(t => t.Values).HasColumnType("jsonb"));
	}
}

public class Foo
{
	public int Id { get; set; }
	
	public string[][] Values { get; set; }
}

Thanks for reporting... I'll take a look at it and try to fix before the 10.0 GA.

Minimal repro

await using var context = new BlogContext();
await context.Database.EnsureDeletedAsync();
await context.Database.EnsureCreatedAsync();

await context.Foos.AddAsync(new Foo { Values = [["value1", "value2"]] });
await context.SaveChangesAsync();

public class BlogContext : DbContext
{
    public DbSet<Foo> Foos { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        => optionsBuilder
           .UseNpgsql("Host=localhost;Username=test;Password=test", o => o.ConfigureDataSource(d => d.EnableDynamicJson()))
           .LogTo(Console.WriteLine, LogLevel.Information)
           .EnableSensitiveDataLogging();

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Foo>(b => b.Property(t => t.Values).HasColumnType("jsonb"));
    }
}

public class Foo
{
	public int Id { get; set; }

	public string[][] Values { get; set; }
}

Is this a blocker for https://www.nuget.org/packages/Npgsql.EntityFrameworkCore.PostgreSQL/10.0.0-rc.2 ?

Allow mapping multidim arrays to json/jsonb again

Allow mapping multidim arrays to json/jsonb again (npgsql#3663)

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Regression related to nested primitive collections in 10.0.0-rc.2 #3652

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Regression related to nested primitive collections in 10.0.0-rc.2 #3652

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roji commented on Nov 7, 2025

onionhammer commented on Nov 11, 2025

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