for removing from model to do multiple columns in terminal use AND




Order of key when creating a model wont  matter
For example
:status, default: "carted" , (it means that is will be added to cart after product is carted)

In order to remove  a change to existing model


short hasn
Order.destroy_all will do all methods

  if no order id after it requested it will rollback, to navigate through this
    ex. belongs_to order: , optional: true


 When creating a controller, alway add change to routes, before addign aything to controller



 if defuault example carrted add status and default on carted, that will no be necessary in controller.  other wise it wiill be

 where: is a collention mehtod



 Big O Continued


 Let's create

 nested loop loop within a loop

 n square number mutiplied nsteps times nsteps



 o(N)
 o(log N)
 o(N2)

 Stay away form N2