Rails Bootcamp [Sesión 03]

Transcript

1. 1.

   RAILS BOOTCAMP 3 JUNIO 2016

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   ACTIVERECORD

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   Modelos

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   $ rails generate model Person

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   /app/models/person.rb

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   Migraciones

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   /db/migrate

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   $ rake db:migrate

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   Crear modelo de datos de tu app recuerden migrar los

   nuevos modelos
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    Jugando con la consola de rails recuerden migrar los nuevos

    modelos
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    $ rails console

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    p = Person.first

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    p.name

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    Person.all

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    Crear asociaciones

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    $ rails generate migration AddReferencesToBook person:references

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    app/models/person.rb class Person < ActiveRecord::Base has_many :books # has_one :book

    end
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    app/models/book.rb class Book < ActiveRecord::Base belongs_to :person end

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    Crear validaciones

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    app/models/person.rb class Person < ActiveRecord::Base validates :name, presence: true end

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    Callbacks

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    before_save after_save before_create after_create before_validation after_validation

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    app/models/person.rb class Person < ActiveRecord::Base before_save :count_pets def count_pets if

    self.email.nil? puts "No tiene mail" else puts "Yeih! #{self.email}" end end end