Question

I’m trying to use NHibernate filters but I’m obtaining a really weird SQL translation
In the mapping file I have this fragment:

<filter name="onlyMProv" 
  condition="Abbreviation in (SELECT AllowedAbbreviation from dbo.AllowedDistricts)" />

in the code then I wrote

session.EnableFilter("onlyMProv");
var districts = session.CreateQuery("from District");

but nHibernate translate this into

select [fields...] 
from dbo.Districts district0_ where district0_.Abbreviation in 
    (SELECT district0_.AllowedAbbreviation from dbo.AllowedDistricts)

Which returns, a “Column name AllowedAbbreviation is not valid”.

As you can see it put the alias district0_ in the subquery…
Any idea ? Am I doing something wrong ?

Thanks in advance!

Answer 1

all columns without prefix are treated as columns of the owning entity. simple solution:

condition="Abbreviation in (SELECT ad.AllowedAbbreviation from dbo.AllowedDistricts ad)"