Ruby on Rails Introduction
- 2. Introduction to Ruby ïŹRuby Syntax and Concepts ïŹVariables ïŹConstants ïŹBlocks ïŹHashes
- 8. Creating active record ïŹuser = User.create(name: "David", occupation: "Code Artist") ïŹuser = User.new ïŹuser.name = "David" ïŹuser.occupation = "Code Artist" ïŹ user.save
- 9. Reading an activerecord from database ïŹusers = User.all ïŹuser = User.first ïŹdavid = User.find_by(name: 'David') ïŹusers = User.where(name: 'David', occupation: 'Code Artist').order('created_at DESC')
- 10. Updating Activerecords attributes ïŹuser = User.find_by(name: 'David') ïŹuser.update(name: 'Dave') ïŹDestroying an ActiveRecors ïŹuser = User.find_by(name: 'David') ïŹuser.destroy
- 11. Validation ïŹ create ïŹ create! ïŹ save ïŹ save! ïŹ update ïŹ update!
- 14. Validation Helpers ïŹAcceptance ïŹclass Person < ActiveRecord::Base ïŹ validates :terms_of_service, acceptance: true ïŹend ïŹvalidates_associated ïŹclass Library < ActiveRecord::Base ïŹ has_many :books ïŹ validates_associated :books ïŹend
- 15. ïŹLength ïŹclass Person < ActiveRecord::Base ïŹ validates :name, length: { minimum: 2 } ïŹ validates :bio, length: { maximum: 500 } ïŹ validates :password, length: { in: 6..20 } ïŹ validates :registration_number, length: { is: 6 } ïŹend ïŹUniqueness ïŹclass Account < ActiveRecord::Base ïŹ validates :email, uniqueness: true ïŹend
- 17. Order and list of Model Call Backs
- 21. Assocaiations ïŹclass Customer < ActiveRecord::Base ïŹend ïŹ class Order < ActiveRecord::Base ïŹend ïŹ@order = Order.create(order_date: Time.now, customer_id: @customer.id)
- 22. ïŹclass Customer < ActiveRecord::Base ïŹ has_many :orders, dependent: :destroy ïŹend ïŹ ïŹclass Order < ActiveRecord::Base ïŹ belongs_to :customer ïŹend ïŹ@order = @customer.orders.create(order_date: Time.now)
- 24. belongs_to ïŹclass Order < ActiveRecord::Base ïŹ belongs_to :customer ïŹend
- 26. has_one :through
- 27. has_many :
- 30. Controller
- 32. CRUD, Verbs, and Actions