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

In Rails 4+, you can also use includes or eager_load to get the same answer:

Project.includes(:vacancies).references(:vacancies).
        where.not(vacancies: {id: nil})

Project.eager_load(:vacancies).where.not(vacancies: {id: nil})