Insert Bulk data using active record import
 Imagine a scenario where you have to create a report and send it to multiple clients, so lets just say you have a report model and you have client and you have report client model.   lets first check all the association and model structure.     #report model    class Report < ActiveRecord::Base     has_many :report_clients     has_many :clients, through: :report_clients   end      #report_client    class ReportClient < ActiveRecord::Base     belongs_to :report     belongs_to :client   end      #clients    class Client < ActiveRecord::Base     has_many :report_clients     has_many :reports, through: :report_clients   end      No lets say you want to create a report for 30 clients. You can do that by adding nested attributes in rails.     so our report model will became       class Report < ActiveRecord::Base     has_many :report_clients     has_many :clients, through: :report_clients     accepts_nested_attributes_for :report_...