Extending LINQ to Nhibernate provider, in combination with Dynamic LINQ problem

Question

I\'m using NHibernate 3.1.0 and I\'m trying to extend the LINQ provider by using BaseHqlGeneratorForMethod and extending the DefaultLinqToHqlGeneratorsReg

Answer 1

There are two, well defined, separate stages here:

1. Converting the dynamic (string) query into a static expression (done by the Dynamic Linq library)
2. Parsing that into an HqlTree, then executing (done by NHibernate)

Since you have determined that a static expression works well, the problem lies in 1.

What happens if you do the following?

var results = Enumerable.Empty().AsQueryable();
string pId = "1";
results = results.Where("Id.ToString().Contains(@0)", pId);

If it fails, you'll have confirmed it's a problem with Dynamic Linq alone (i.e. it doesn't support the expression you're feeding it), so you'll have to dig into it and patch it.

Semi-related: the ToStringGenerator looks useful; could you submit a patch for NHibernate? http://jira.nhforge.org