C#•4w ago

"Duplicate property" Entity Framework 8 Error

I've got this error popping up on OnModelCreating method:

System.InvalidOperationException: 'The property or navigation 'Rotation' cannot be added to the 'AlternativeShift' type because a property or navigation with the same name already exists on the 'AlternativeShift' type.'

System.InvalidOperationException: 'The property or navigation 'Rotation' cannot be added to the 'AlternativeShift' type because a property or navigation with the same name already exists on the 'AlternativeShift' type.'

this is how I'm setting up AlternativeShift there:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);

    modelBuilder.Entity<AlternativeShift>(entity =>
    {
        entity.HasKey(e => e.Id)
            .HasName("PK__Alternat__3214EC068342A05F")
            .IsClustered(false);

        entity.HasIndex(e => e.Rotation, "IX_AlternativeShifts->Rotation");
        
        entity.HasIndex(e => e.Shift, "IX_AlternativeShifts->Shift");
        
        entity.HasIndex(e => new { e.Rotation, e.Shift, e.Weekday }, "UQ_RotaShiftWeekday").IsUnique();
        
        entity.Property(e => e.Id).ValueGeneratedNever();
        
        entity.HasOne(d => d.Rotation).WithMany(p => p.AlternativeShifts)
            .HasForeignKey(d => d.RotationId)
            .OnDelete(DeleteBehavior.ClientSetNull)
            .HasConstraintName("FK_AlternativeShift.Rotation");
        
        entity.HasOne(d => d.Shift).WithMany(p => p.AlternativeShifts)
            .HasForeignKey(d => d.ShiftId)
            .OnDelete(DeleteBehavior.ClientSetNull)
            .HasConstraintName("FK_AlternativeShift.Shift");
        
        entity.HasOne(d => d.Weekday).WithMany(p => p.AlternativeShifts)
            .HasForeignKey(d => d.WeekdayId)
            .HasConstraintName("FK__Alternati__Weekd__1352D76D");
    });

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);

    modelBuilder.Entity<AlternativeShift>(entity =>
    {
        entity.HasKey(e => e.Id)
            .HasName("PK__Alternat__3214EC068342A05F")
            .IsClustered(false);

        entity.HasIndex(e => e.Rotation, "IX_AlternativeShifts->Rotation");
        
        entity.HasIndex(e => e.Shift, "IX_AlternativeShifts->Shift");
        
        entity.HasIndex(e => new { e.Rotation, e.Shift, e.Weekday }, "UQ_RotaShiftWeekday").IsUnique();
        
        entity.Property(e => e.Id).ValueGeneratedNever();
        
        entity.HasOne(d => d.Rotation).WithMany(p => p.AlternativeShifts)
            .HasForeignKey(d => d.RotationId)
            .OnDelete(DeleteBehavior.ClientSetNull)
            .HasConstraintName("FK_AlternativeShift.Rotation");
        
        entity.HasOne(d => d.Shift).WithMany(p => p.AlternativeShifts)
            .HasForeignKey(d => d.ShiftId)
            .OnDelete(DeleteBehavior.ClientSetNull)
            .HasConstraintName("FK_AlternativeShift.Shift");
        
        entity.HasOne(d => d.Weekday).WithMany(p => p.AlternativeShifts)
            .HasForeignKey(d => d.WeekdayId)
            .HasConstraintName("FK__Alternati__Weekd__1352D76D");
    });

8 Replies

Rename•4w ago

this is my AlternativeShift class: and this is my AlternativeShift class:

namespace Domain
{
    using System;
    using System.ComponentModel.DataAnnotations.Schema;

    public class AlternativeShift
    {
        public Guid Id { get; set; }

        [Column("Rotation")]
        public Guid RotationId { get; set; }

        [Column("Shift")]
        public Guid ShiftId { get; set; }

        [Column("Weekday")]
        public Guid? WeekdayId { get; set; }

        public Weekday Weekday { get; set; }

        public Rotation Rotation { get; set; }

        public Shift Shift { get; set; }
    }
}

namespace Domain
{
    using System;
    using System.ComponentModel.DataAnnotations.Schema;

    public class AlternativeShift
    {
        public Guid Id { get; set; }

        [Column("Rotation")]
        public Guid RotationId { get; set; }

        [Column("Shift")]
        public Guid ShiftId { get; set; }

        [Column("Weekday")]
        public Guid? WeekdayId { get; set; }

        public Weekday Weekday { get; set; }

        public Rotation Rotation { get; set; }

        public Shift Shift { get; set; }
    }
}

Jimmacle•4w ago

        [Column("Rotation")]
        public Guid RotationId { get; set; }

        public Rotation Rotation { get; set; }

        [Column("Rotation")]
        public Guid RotationId { get; set; }

        public Rotation Rotation { get; set; }

is probably confusing it, you don't need that attribute

jcotton42•4w ago

Also I personally would name that column RotationId anyways.

Rename•4w ago

well, it's named as Rotation in the DB, which is why I'm adding that. The deal is that it was a legacy website which I started to update to .net 8 But eitherway even removing the Column annotation the same error pops up!

dreadfullydistinct•4w ago

if you have an existing database, is there a reason you aren't using scaffolding / reverse-engineering?

Rename•4w ago

I did, thats how that class AlternativeShift was created initially. I simply added the column data annotations. Used to work before!

dreadfullydistinct•4w ago

Ahh I see

Rename•4w ago

looking further into the modelBuilder, I can see there's two RotationIds, one being a shadow property. not sure why this would get created as I already have RotationId field

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"Duplicate property" Entity Framework 8 Error