LexWells.Infrastructure/LexWells.Infrastructure.EntityFramework/UpdateAuditableEntitiesInterceptor.cs

using LexWells.Infrastructure.EntityFramework.Entities;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Diagnostics;

namespace LexWells.Infrastructure.EntityFramework;

public class UpdateAuditableEntitiesInterceptor : SaveChangesInterceptor
{
    public override ValueTask<InterceptionResult<int>> SavingChangesAsync(
        DbContextEventData eventData, 
        InterceptionResult<int> result, 
        CancellationToken cancellationToken = default)
    {
        var context = eventData.Context;

        if (context == null) 
        {
            return base.SavingChangesAsync(eventData, result, cancellationToken);
        }

        // Find all entities that are being modified and inherit from BaseEntity
        var entries = context.ChangeTracker
            .Entries<BaseEntity>()
            .Where(e => e.State == EntityState.Modified);

        foreach (var entry in entries)
        {
            entry.Entity.UpdatedAt = DateTime.UtcNow;
        }

        return base.SavingChangesAsync(eventData, result, cancellationToken);
    }
}