public SeasonalItemsViewModel()
{
Title = "What's in Season?";
Items = new ObservableConcurrentDictionary <int, SeasonalItem>();
DocsChangeIndexes = new HashSet <int>();
LoadItemsCommand = new Command(() => ExecuteLoadItemsCommand());
SaveDocumentsCommand = new Command(async() => await ExecuteSaveDocumentsCommand());
//tag::LoadData[]
var q = QueryBuilder.Select(SelectResult.All())
.From(DataSource.Database(_db))
.Where(Meta.ID.EqualTo(Expression.String(CoreApp.DocId)))
.AddChangeListener((sender, args) =>
{
var allResult = args.Results.AllResults();
var result = allResult[0];
var dict = result[CoreApp.DB.Name].Dictionary;
var arr = dict.GetArray(CoreApp.ArrKey);
if (arr.Count < Items.Count)
{
Items = new ObservableConcurrentDictionary <int, SeasonalItem>();
}
Parallel.For(0, arr.Count, i =>
{
var item = arr[i].Dictionary;
var name = item.GetString("key");
var cnt = item.GetInt("value");
var image = item.GetBlob("image");
if (_items.ContainsKey(i))
{
_items[i].Name = name;
_items[i].Quantity = cnt;
_items[i].ImageByteArray = image?.Content;
}
else
{
var seasonalItem = new SeasonalItem {
Index = i,
Name = name,
Quantity = cnt,
ImageByteArray = image?.Content
};
_items.Add(i, seasonalItem);
}
});
});
//end::LoadData[]
}
public async Task <bool> UpdateItemAsync(SeasonalItem item)
{
using (var doc = _db.GetDocument(CoreApp.DocId))
using (var mdoc = doc.ToMutable())
using (MutableArrayObject listItems = mdoc.GetArray(CoreApp.ArrKey)) {
var dictObj = listItems.GetDictionary(item.Index);
dictObj.SetString("key", item.Name);
dictObj.SetInt("value", item.Quantity);
var blob = new Blob("image/png", item.ImageByteArray);
dictObj.SetBlob("image", blob);
_db.Save(mdoc);
}
return(await Task.FromResult(true));
}