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
rails g migration adaugă coloane
$ rails generate migration AddDetailsToProducts part_number:string price:decimal
cum creați șine de migrare
rails g migration AddPartNumberToProducts
activerecord adaugă coloană
class AddPartNumberToProducts < ActiveRecord::Migration[6.0]
def change
add_column :products, :part_number, :string
end
end
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
șine model coloană
class AddColumnTitles < ActiveRecord::Migration
def up
add_column :titles, :place, :string
end
def down
remove_column :titles, :place, :string
end
end