MergeResultsAsync(int queryId, IList <TodoItemReference> lastResults, IList <TodoListItem> matchedItems)
{
// remove stale result items
var mergedResults = new List <TodoItemReference>();
foreach (TodoItemReference result in lastResults)
{
var item = matchedItems.FirstOrDefault(i => i.Id == result.Item.Id);
if (item != null)
{
// result still relevant, remove it from matching list
matchedItems.Remove(item);
mergedResults.Add(result);
}
else
{
// result is stale, remove it from result set
PositionAdjuster.AdjustForDelete(result, lastResults.ToList <ISortable>());
_context.TodoReferences.Delete(result);
}
}
// append new ones
foreach (TodoListItem item in matchedItems)
{
var result = new TodoItemReference()
{
Item = item,
Position = mergedResults.Count,
TodoQueryId = queryId
};
mergedResults.Add(result);
await _context.TodoReferences.AddAsync(result);
}
return(mergedResults);
}
public async Task <ActionResult <TodoItemReference> > MoveReferenceAsync(int id, [FromBody] TodoItemReference reference)
{
var current = await _context.TodoReferences.GetAsync(id);
if (current == null)
{
return(NotFound());
}
// re-arrange other references affected by move
var references = await _context.TodoReferences.GetAsync(r => r.TodoQueryId == reference.TodoQueryId);
PositionAdjuster.AdjustForUpdate(reference, references.ToList <ISortable>(), current);
// move reference to desired location
current.UpdateFrom(reference);
_context.TodoReferences.Update(current);
await _context.SaveChangesAsync();
return(current);
}
