HQL joins in Grails: Part Deux

Question

This is an extension of the question I asked here

I have a relationship like this

class Foo {
    static hasMany = [bars: Bar]
}

class Bar {
    // Has          


        

Answer 1

Something like this should work:

select foo from Foo foo
where not exists (select thingBar.id from Thing thing left join thing.bars thingBar
                  where thing.id = :thingId
                  and thingBar.id not in (select fooBar.id from Foo foo2
                                          left join foo2.bars fooBar
                                          where foo2.id = foo.id))

EDIT: Now that you've explained what you wanted with a nice picture, it's simpler. In fact what you want is all the Foos which are linked to at least one bar (and not all the bars) also linked to the Thing. The query would thus be:

select foo from Foo foo
inner join foo.bars fooBar
where fooBar.id in (select thingBar.id from Thing thing inner join thing.bars thingBar)

Answer 2

Would something like this work ?

Foo.withCriteria {
    bars {
        in('id', thing.bars.collect { it.id })
    }
}