Where: class Teacher < ActiveRecord::Base has_and_belongs_to_many :students end and class Student < ActiveRecord::Base has_and_belongs_to_many :teachers end for rails 4: rails generate migration CreateJoinTableStudentTeacher student teacher for rail...

~ gs$ brew install elasticsearch ==> Downloading https://download.elastic.co/elasticsearch/elasticsearch/elasticsearch ######################################################################## 100.0% curl: (33) HTTP server doesn't seem to support byte ranges. Cannot resume. ...