Attr Accessible

book.rb

class Book < ActiveRecord::Base
  # Other stuff should go up here, the following is an example of attr_accessible to allow mass assignment
  # Mass assignment is when you do something like Book.create(title: "1984")
  attr_accessible :title
end

store.rb

class Store < ActiveRecord::Base
  # Here's another example of attr_accessible to allow mass-assignment
  # Non-mass assignment would look like the following: 
  # store = Store.new
  # store.name = "Amazon"
  # store.save
  # But if you want to do Store.create(name: "Barnes and Nobel")
  # You would need the following: 
  attr_accessible :name
end

These are you Rails models, stored in app/model