How to drop columns using Rails migration

Question

What\'s the syntax for dropping a database table column through a Rails migration?

Answer 1

Remove Columns For RAILS 5 App

rails g migration RemoveFrom [columnName:type]

Command above generate a migration file inside db/migrate directory. Snippet blow is one of remove column from table example generated by Rails generator,

class RemoveAgeFromUsers < ActiveRecord::Migration
  def up
    remove_column :users, :age
  end
  def down
    add_column :users, :age, :integer
  end
end

I also made a quick reference guide for Rails which can be found at here.