How to use AutoMapper to convert ODataQueryOptions<A> to ODataQueryOptions<B>, where A is my DTO and B is my entity.
I need this to use the ApplyTo() method to generate the correct expression query. AutoMapper has a ProjectTo(), but it has issues when your DTO has a calculated property. In this case, if you pass a $top on the query string I get this issue:
System.InvalidOperationException: The LINQ expression 'DbSet<Summary>()
.Where(s => !(s.IsDeleted))
.OrderBy(s => s.Date)
.ThenBy(s => s.Description)
.ThenBy(s => s.TemperatureC)
.ThenBy(s => new SummaryDto{
Date = s.Date,
Description = s.Description,
TemperatureC = s.TemperatureC
}
.TemperatureF)' could not be translated.
Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to 'AsEnumerable', 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'.
See https://go.microsoft.com/fwlink/?linkid=2101038 for more information.
My Summary class looks like this:
public class Summary
{
public string Description { get; set; }
public int TemperatureC { get; set; }
public DateTime Date { get; set; }
}
and the DTO SummaryDto:
public class SummaryDto
{
public DateTime Date { get; set; }
public string Description { get; set; }
public int TemperatureC { get; set; }
public int TemperatureF { get; set; }
}
I was trying to do this:
public async Task<DataSourceResult> GetSummaries(ODataQueryOptions<SummaryDto> oDataQueryOptions)
{
IQueryable<Summary> summariesIQ = _summaryRepository.GetAll();
IQueryable<SummaryDto> summaryDtoIQ = summariesIQ.ProjectTo<SummaryDto>(_mapper.ConfigurationProvider);
var res2 = oDataQueryOptions.ApplyTo(summaryDtoIQ);
var result = new DataSourceResult
{
Data = res2
};
return result;
}
My HTTP request is:
https://localhost:5001/api/weather_forecast?$top=1