public async Task <QueryResponse <GetLastResponse[]> > Handle(GetLastRequest query, CancellationToken cancellationToken)
{
try
{
if (!Validate(query))
{
return(new QueryResponse <GetLastResponse[]>(MessageType.Validation, new QueryResponseError("Validate", Errors.First())));
}
return(new QueryResponse <GetLastResponse[]>(await _dbContext.Set <UserSearchData>()
.Where(item => item.UserId.Equals(query.UserId))
.OrderByDescending(item => item.SearchTime)
.Take(query.Count)
.Select(item => new GetLastResponse()
{
CityName = item.CityName,
Temperature = item.Temperature,
Humidity = item.Humidity
})
.AsNoTracking()
.ToArrayAsync()));
}
catch (Exception ex)
{
return(new QueryResponse <GetLastResponse[]>(MessageType.Error, ex));
}
}
private bool Validate(GetLastRequest query)
{
if (string.IsNullOrEmpty(query.UserId))
{
Errors.Add("User Id can not be empty");
}
if (query.Count <= 0)
{
Errors.Add("The number of returned item can not be less than 1");
}
return(Errors.Count == 0);
}