Rails Migrations

post setup:

1. SDP in Rails  

2. Migrations 

3. handelingen die daarbij worden verrciht 

4. praktisch modelleren met de db

create, add, delete, modify, change the name, change the order of columns

Example of a simple migration:

  class AddSsl < ActiveRecord::Migration
    def self.up
      add_column :accounts, :ssl_enabled, :boolean, :default => 1
    end

    def self.down
      remove_column :accounts, :ssl_enabled
    end
  end

Example of a more complex migration that also needs to initialize data:

  class AddSystemSettings < ActiveRecord::Migration
    def self.up
      create_table :system_settings do |t|
        t.string  :name
        t.string  :label
        t.text  :value
        t.string  :type
        t.integer  :position
      end

      SystemSetting.create :name => "notice", :label => "Use notice?", :value => 1
    end

    def self.down
      drop_table :system_settings
    end
  end

See http://dizzy.co.uk/ruby_on_rails/cheatsheets/rails-migrations

Rails Migrations

Relevante links:

1. http://rubyonrails.org
2. http://dizzy.co.uk/ruby_on_rails/cheatsheets/rails-migrations

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