sql - Nhibernate queryover filter based on count of child collection -


ultimately want filter parent objects have less 2 children.

i'm building search screen grid dashboard, uses following logic example of how build query. 

var query = session.queryover<parent>(() => parentalias);  if (!string.isnullorwhitespace(searchcriteria.openedby))     query.where(restrictions.eq(projections.property<parent>(x => x.openedby), searchcriteria.openedby));  if (searchcriteria.openeddatestart != null)     query.where(restrictions.ge(projections.property<parent>(x => x.openedat), searchcriteria.openeddatestart));

this working wonderfully right until point:

if (!string.isnullorempty(searchcriteria.childrenaffected) && searchcriteria.childrenaffected == "multi")     query.where(() => parentalias.children.count > 2);

it makes sense .count does't work, isn't linq. .count() throws error. honestly, feel i've tried every combination of restritions, joinalias, etc can think of, i've gone off path of educated attempts , realm wild guessing long time ago.

how set query filter out parent based on count of children in queryover syntax?

-----note ----- debated using linq after id gotten list, i'm doing paging in query set filter applied after page came back.

you need subquery...

children childrenalias = null; var subquery = queryover.of<children>(() => childrenalias)      .where(() => childrenalias.parent.id == parentalias.id)      .torowcountquery(); query.withsubquery.wherevalue(2).le(subquery);

note don't know how count > 2, i'm doing 2 <= count, , there possibility instead of 

.where(() => childrenalias.parent.id == parentalias.id)

you can write

.where(() => childrenalias.parent == parentalias)

mmmh... if reall need count > 2 should able to:

query.where(restrictions.gt(projections.subquery(subquery), 2));

or 

query.withsubquery.where(() => subquery.as<int>() > 4);

(this 1 haven't ever used... taken http://blog.andrewawhitaker.com/blog/2014/10/24/queryover-series-part-8-working-with-subqueries/)


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