How can I count the result of an ActiveRecord .group query? Chaining .count returns a hash

Question

I can use the following :

User.where(\"zip_code = \'48104\'\").group(\'users.id\').count

To get hashes like :

{195=>1, 1         


        

Answer 1

As said before by orourkedd the accepted answer is not great when dealing with a large amount of records. I too recently encountered this issue and have large tables that I definitely don't want to load into memory. So here is what works for me.

users=User.where("zip_code = '48104'").group('users.id')
user_count=User.where(id: users.select(:id)).count

Rails will handle the users.select part like a subquery. This works with Rails 4