Șine de migrare add_column

Exemple de cod

6
0

cum se adaugă coloana la șinele de masă


rails g migration add_description_to_users description:string
#'g' means generate, the 'add' in 'add_description_to_users' tells
#Rails you want to add a column, the 'description' is the new column name,
#and the 'users' is the table you want to add it to, must be plural. 
#After you've checked your migration to make sure its what you want...
rails db:migrate
5
0

rails g migration adaugă coloane

$ rails generate migration AddDetailsToProducts part_number:string price:decimal
4
0

cum creați șine de migrare

rails g migration AddPartNumberToProducts
2
0

activerecord adaugă coloană

class AddPartNumberToProducts < ActiveRecord::Migration[6.0]
  def change
    add_column :products, :part_number, :string
  end
end
1
0

cum se creează un tabel SQL în ruby

def self.create_table
    sql = <<-SQL
      CREATE TABLE IF NOT EXISTS IF NOT EXISTS students (
        name TEXT,
        grade TEXT
      )
    SQL
    DB[:conn].execute(sql)
  end
-1
0

șine model coloană

class AddColumnTitles < ActiveRecord::Migration
  def up
    add_column :titles, :place, :string
  end

  def down
    remove_column :titles, :place, :string
  end
end

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