public TodoSpec Build(TodoQueryParams request)
{
var specs = new List <TodoSpec>();
specs.Add(BuildInclude(request.Include));
specs.Add(BuildExclude(request.Exclude));
specs.Add(BuildDue(
request.Overdue, request.HasDueDate, exactly: request.Due, begin: request.DueAfter, end: request.DueBefore
));
specs = specs.Where(x => x != null).ToList();
if (specs.Count() < 1)
{
return(Spec.All <Todo>());
}
return(specs.Aggregate((spec, next) => spec.And(next)));
}