WILT: Query by Criteria with clause on component property with NHibernate

It took me a little bit to figure this one out but it makes sense and it’s pretty simple once we know:

Let’s say I have a class MyFirstClass with a component of type MySecondClass and I want to write a query to retrieve all MyFirstClass objects where the ID of MySecondClass is 1.
My first attempt went like this:

     .Eq("MySecondClass.ID", "1"));
That didn’t work because NHibernate doesn’t understand what I meant with MySecondClass.ID.
The solution is simply to use a sub criteria like so:
      .Eq("ID", "1"));

It is important to notice that the sub criteria is created using the Property name

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