remove_foreign_key

# File activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb, line 103
        def remove_foreign_key(from_table, to_table = nil, **options)
          # RESTRICT is by default in MySQL.
          options.delete(:on_update) if options[:on_update] == :restrict
          options.delete(:on_delete) if options[:on_delete] == :restrict
          super
        end