Find all records which have a count of an association greater than zero

Question

I\'m trying to do something that I thought it would be simple but it seems not to be.

I have a project model that has many vacancies.

class Project &         


        

Answer 1

Yeah, vacancies is not a field in the join. I believe you want:

Project.joins(:vacancies).group("projects.id").having("count(vacancies.id)>0")