Fluent NHibernate “Could not resolve property”

Question

I have read a lot of the questions about that same error but none since to match my exact problem. I\'m trying to access the property of an object, itself part of a root obj

Answer 1

Another explanation is that you are missing your mapping of this property or field in a NHibernateClassMapping definition. I came here about why I was getting this error based on the following scenario.

 var query = scheduleRepository.CurrentSession().Query()
                .Where(x => x.ScheduleInfo.StartDate.Date < dateOfRun.Date);

This was giving me a Could Not Resolve Property error for StartDate. This was a head scratcher, since I use this syntax all the time.

My mapping file was the following:

public class ScheduleInfoMapping : NHibernateClassMapping
    {
        public ScheduleInfoMapping()
        {
            DiscriminateSubClassesOnColumn("Type");
            Map(x => x.Detail).MapAsLongText();
        }
    }

which was missing the StartDate. Changed to:

public class ScheduleInfoMapping : NHibernateClassMapping
    {
        public ScheduleInfoMapping()
        {
            DiscriminateSubClassesOnColumn("Type");
            Map(x => x.Detail).MapAsLongText();
            Map(x => x.StartDate);
        }
    }

Which resolved the error.