SetAntonymReferenceChange.cs

using SIL.Harmony.Changes;
using SIL.Harmony.Entities;
using SIL.Harmony.Sample.Models;

namespace SIL.Harmony.Sample.Changes;

public class SetAntonymReferenceChange(Guid entityId, Guid antonymId, bool setObject = true)
    : EditChange<Word>(entityId), ISelfNamedType<SetAntonymReferenceChange>
{
    public Guid AntonymId { get; set; } = antonymId;
    public bool SetObject { get; set; } = setObject;

    public override async ValueTask ApplyChange(Word entity, IChangeContext context)
    {
        //if the word being referenced was deleted before this change was applied (could happen after a sync)
        //then we don't want to apply the change
        //if the change was already applied,
        //then this reference is removed via Word.RemoveReference after the change which deletes the Antonym, see SnapshotWorker.MarkDeleted
        var antonym = await context.GetCurrent<Word>(AntonymId);
        if (antonym is null or { DeletedAt: not null }) return;

        entity.Antonym = SetObject ? antonym : null;
        entity.AntonymId = AntonymId;
    }
}