Fluent NHibernate N+1 issue with complex objects

Question

I\'m having a problem with NHibernate querying the database way too many times. I just realized it likely relates to the n+1 problem but I can\'t figure out how to change my map

Answer 1

The way to go is to use batch fetching. Read more about it here:

How to Eager Load Associations without duplication in NHibernate?

On every entity mapping apply BatchSize (for many-to-one relation - avoiding 1 + N)

public ReportMap()
{
   Table(...)
   BatchSize(25);
   ...

And on every collection (solves issue with one-to-many 1 + N)

HasMany(x => x.Reports)
      .KeyColumn("StackTraceId")
      .BatchSize(25)
      ...