java - hibernate/jpa criteria, query if an object exists in a many to many relation -


i have class offer many many relation department:

class offer {      @manytomany(fetch = fetchtype.eager, cascade = { cascadetype.merge, cascadetype.refresh })     @jointable(name = "offer_department", joincolumns = @joincolumn(name = "offer_id"), inversejoincolumns = @joincolumn(name = "namecode_id"))     private set<namedcode> department;      ... }

how can use jpa criteriabuilder search offer objects contain department (namedcode).

this should part of greater query (see todo part):

criteriabuilder builder = getsession().getcriteriabuilder(); criteriaquery<offer> criteria = builder.createquery(offer.class); root<offer> root = criteria.from(offer.class);  list<predicate> restrictions = new arraylist<>(); if (fromdate != null && todate != null) {     restrictions.add(builder.between(root.get("entrydate"), fromdate, todate)); } if (department != null) {     // todo check if offer object has assigned passed department } // add more restrictions  criteria.orderby(builder.asc(root.get("entrydate")));

i figured out, have use join after all:

restrictions.add(builder.equal(root.join("department").get("id"), department.getid()));

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