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Ruby on Rails with Active Record
This document provides an overview of Ruby on Rails and how it interacts with databases. It discusses scaffolding which can quickly generate code to view, delete and update database resources. It also covers migrations which allow modifying the database schema and reverting changes. Additionally, it explains that Active Record handles interacting with database data through CRUD operations and defines an object that wraps a database row and encapsulates data access and domain logic. The document then reviews various Rails commands and associations between models.
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Ruby on Rails with Active Record
- 1. Ruby on Rails WithActive Record Burak İnce - 15.04.2017
- 2. Ruby & RoR Whatis Ruby? What is Ruby on Rails? What is Rake? https://martinfowler.com/articles/rake.html Installation? https://gorails.com/setup/
- 3. How Rails InteractingWith Database? Scaffolding Being able to quickly generate code to view, delete and update resources. Essentially a code- generator for entities. Migrations Ruby code that lets you modify the database. You can create migrations and apply them to the database, which takes the database to a different state. You can then roll back migrations, allowing them to return to a previous state. Active Record Interaction with the database data. CRUD
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- 5. Migrations Applying scaffolding toDB http://guides.rubyonrails.org/v4.2/active_record_migrations.html
- 6. Active Record (DesignPattern) An object that wraps a row in a database table or view, encapsulates the database access, and adds domain logic on that data. https://www.martinfowler.com/eaaCatalog/activeRecord.html An object carries both data and behavior. Much of this data is persistent and needs to be stored in a database. Active Record uses the most obvious approach, putting data access logic in the domain object. This way all people know how to read and write their data to and from the database.
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- 9. CRUD - Retrieve/ Read
- 10. CRUD - Retrieve/ Read - where, find_by, find_by!
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- 13. DB Seed db/seeds.rb letsyou seeds the database Use create! - otherwise it will fail silently
- 14. Rails Associations /Relations Rails supports six types of associations: belongs_to has_one has_many has_many :through has_one :through has_and_belongs_to_many
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- 18. The has_many :throughAssociation
- 19. The has_one :throughAssociation
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Editor's Notes
- #3 ruby -v rails -v rake -T
- #5 rails new OnlineBranch rails g scaffold customer name surname birth_date:integer rake db:migrate rails g modal address city district neightborhood
- #6 rails generate migration add_email_to_customers email:string rake db:rollback
- #8 rails c Customer.column_names Customer.primary_key
- #9 c1 = Customer.new c1.name = "Burak" c1.surname = "Ince" c1.birth_date = 21081987 C1.save c2 = Customer.create(name: "Burak", surname: "Ince", birth_date: 21081987)
- #10 Customer.all.order(name: :desc).to_a Customer.first Customer.all.first Customer.all[0] Customer.take Customer.pluck(:surname)
- #11 Customer.where(name: "Burak") Customer.where(name: "Burak").first Customer.where(name: "Burak")[0] Customer.find_by(name: "Deneme") Customer.find_by!(name: "Deneme")
- #12 Customer.find_by(name: "Burak").update(name: "Murat")
- #13 Customer.find_by(name: "Murat").destroy c1 = Customer.find_by(name: "Ince") Customer.delete(c1.id) Customer.count
- #14 Customer.destroy_all Customer.create! [ { name: "User1Name", surname: "User1Surname", birth_date: 10101970 }, { name: "User2Name", surname: "User2Surname", birth_date: 10101971 }, { name: "User3Name", surname: "User3Surname", birth_date: 10101972 }, { name: "User4Name", surname: "User4Surname", birth_date: 10101973 }, { name: "User5Name", surname: "User5Surname", birth_date: 10101974 }, { name: "User6Name", surname: "User6Surname", birth_date: 10101975 }, { name: "User7Name", surname: "User7Surname", birth_date: 10101976 } ] rake db:seed