Cascade delete model in rails -

class car < activerecord::base end  class city < activerecord::base   has_many :cars_available, dependent: :destroy end  class carsavailable < activerecord::base   belongs_to :car   belongs_to :city end 

i have 2 models car , city, , third model carsavailable stores particular cars available in particular city.

how set destroy association between car , carsavailable when car removed corresponding carsavailable entry deleted.

i figured out city little ambiguous how apply car.

this trick:

class car < activerecord::base   has_many :cars_available, dependent: :destroy end 

add association car , tell destroy association, did city.