如何使用rails控制台从表中删除列

Question

It is easily possible to remove a column using rails migration.

class SomeClass < ActiveRecord::Migration
  def self.up
    remove_column :table_name, :column_name
  end
end

I want to know if there is any way to remove a column from table using console.

Answer 1

You can run the codes in up method directly in rails console :

>> ActiveRecord::Migration.remove_column :table_name, :column_name

If you already have a migration file such as " db/migrate/20130418125100_remove_foo.rb ", you can do this:

>> require "db/migrate/20130418125100_remove_foo.rb"
>> RemoveFoo.up

If you just want to do rake db:migrate , try this:

>> ActiveRecord::Migrator.migrate "db/migrate"