prs/prs.stores/EquipmentStore.cs

using System.Collections.Generic;
using System.Linq;
using Comal.Classes;
using InABox.Core;
using System;

namespace Comal.Stores
{
    public class EquipmentStore : SchedulableStore<Equipment>
    {
        protected override void AfterSave(Equipment entity)
        {
            UpdateLinkedTracker(entity);

            base.AfterSave(entity);
        }

        private void UpdateLinkedTracker(Equipment entity)
        {
            if (entity.TrackerLink.HasOriginalValue(x => x.ID))
            {
                var oldID = entity.TrackerLink.GetOriginalValue(x => x.ID);
                var newID = entity.TrackerLink.ID;

                var trackers = Provider.Query(
                    new Filter<GPSTracker>(x => x.ID).IsEqualTo(oldID).Or(x => x.ID).IsEqualTo(newID),
                    Columns.None<GPSTracker>().Add(x => x.ID, x => x.Equipment.ID)
                );

                var updates = new List<GPSTracker>();
                var prev = trackers.Rows.FirstOrDefault(r => r.Get<GPSTracker, Guid>(c => c.ID).Equals(oldID));
                if (prev != null)
                {
                    var tracker = prev.ToObject<GPSTracker>();
                    tracker.Equipment.ID = Guid.Empty;
                    updates.Add(tracker);
                }

                var curr = trackers.Rows.FirstOrDefault(r => r.Get<GPSTracker, Guid>(c => c.ID).Equals(newID));
                if (curr != null)
                {
                    var tracker = curr.ToObject<GPSTracker>();
                    tracker.Equipment.ID = entity.ID;
                    updates.Add(tracker);
                }

                if (updates.Any())
                    Provider.Save(updates);
            }
        }
    }
}