public static IQueryable <T> OrderBy <T>(IQueryable <T> query, EnumMap <RecommendationsKey, T> map, List <ISort> sorts)
{
foreach (var sort in sorts)
{
if (!Enum.TryParse(sort.Key, true, out RecommendationsKey key))
{
throw new Exception("Unknown filter key in repository");
}
var propertyName = map.Resolve(key);
query = Order(query, sort, propertyName);
}
return(query);
}
public static IQueryable <string> DistinctFieldValues <T>(IQueryable <T> query, EnumMap <RecommendationsKey, T> map, IMultiSelectField field)
{
if (!Enum.TryParse(field.Key, true, out RecommendationsKey key))
{
throw new Exception("Unknown multi-select key in repository");
}
var propertyName = map.Resolve(key);
Type t = typeof(RecommendationProductSummary);
PropertyInfo property = t.GetProperty(propertyName);
var resultQuery = query.Select(ds => Convert.ToString(property.GetValue(ds))).Distinct().OrderBy(x => x);
return(resultQuery);
}
public static IQueryable <RecommendationProductSummary> Filter(IQueryable <RecommendationProductSummary> query, EnumMap <RecommendationsKey, RecommendationProductSummary> map, List <IFilter> filters)
{
var operators = new List <OperatorGroup>();
foreach (var filter in filters)
{
if (!Enum.TryParse(filter.Key, true, out RecommendationsKey key))
{
throw new Exception("Unknown filter key in repository");
}
var mappedKey = map.Resolve(key);
operators.Add(BuildOperatorGroup(mappedKey, filter));
}
var parameterOfT = Expression.Parameter(typeof(RecommendationProductSummary), "x");
var expression = operators.ToExpression(parameterOfT);
var finalSelector = Expression.Lambda <Func <RecommendationProductSummary, bool> >(expression, parameterOfT);
return(query.Where(finalSelector));
}