public static Task <ReviewsPage> NextPage(this ReviewsPage page, int fetchSize = 5)
{
if (page.NextKey == null)
{
throw new RegenException("There are no more reviews to fetch");
}
return(ReGenClient.Instance.Reviews.GetPage(page.RecipeId, page.NextKey, fetchSize));
}
private void OnReviewsPage(object sender, EventArgs e)
{
var user = (EmployeeViewModel)BindingContext;
var reviewsPage = new ReviewsPage()
{
BindingContext = user.ReceivedReviews
};
Navigation.PushAsync(reviewsPage);
}
public async Task <ReviewsPage> GetReviewsPageAsync(string recipeId, string pageStartKey, int pageSize)
{
try
{
// To-do: config options for index names and page sizes
IReadOnlyCollection <FirebaseObject <Review> > results;
if (!String.IsNullOrWhiteSpace(pageStartKey))
{
results = await _client.Child("reviews")
.Child(recipeId)
.OrderByKey()
.EndAt(pageStartKey)
.LimitToLast(pageSize + 1)
.OnceAsync <Review>();
}
else
{
results = await _client.Child("reviews")
.Child(recipeId)
.OrderByKey()
.LimitToLast(pageSize + 1)
.OnceAsync <Review>();
}
if (results.Count < 1)
{
throw new NoResultsFoundException("No reviews found for recipe ID: " + recipeId);
}
//var ratings = results.Select(async o =>
// new KeyValuePair<string, int>
// (o.Object.UserId,
// await GetUserRatingAsync(o.Object.UserId, recipeId))
//);
// If the number of results is less than the requested page size, don't generate a "start key"
var page = results.Count < pageSize ? results : results.Skip(1);
var ratings = new Dictionary <string, int>();
foreach (var r in page)
{
var rating = await GetUserRatingAsync(r.Object.UserId, recipeId);
ratings.Add(r.Object.UserId, rating);
}
var reviews = from pair in page
select new Review
{
RecipeId = recipeId,
ReviewId = pair.Key,
UserId = pair.Object.UserId,
Content = pair.Object.Content,
Timestamp = pair.Object.Timestamp,
Rating = ratings[pair.Object.UserId]
};
var trimmedPage = reviews.Reverse();
//trimmedPage.RemoveAt(trimmedPage.Count - 1);
var reviewPage =
new ReviewsPage
{
NextKey = results.Count < pageSize ? null : results.First().Key,
Reviews = trimmedPage
};
return(reviewPage);
}
catch (Exception)
{
throw;
}
}
