Foreigner methods to create and remove foreign keys for cross schema use in PostgreSQL

foreigner_ext.rb

ActiveRecord::Migration.class_eval do
  def add_foreign_key_ignore_prefix(from_table, to_table, options = {})
    table_name_prefix = ActiveRecord::Base.table_name_prefix
    ActiveRecord::Base.table_name_prefix = ''
    add_foreign_key(from_table, to_table, options)
    ActiveRecord::Base.table_name_prefix = table_name_prefix
  end

  def remove_foreign_key(from_table, options = {})
    table_name_prefix = ActiveRecord::Base.table_name_prefix
    super(from_table.to_s.gsub(/#{table_name_prefix}/, ''), options)
  end
end