add_foreign_key

# File activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb, line 55
        def add_foreign_key(from_table, to_table, **options)
          assert_valid_deferrable(options[:deferrable])

          alter_table(from_table) do |definition|
            to_table = strip_table_name_prefix_and_suffix(to_table)
            definition.foreign_key(to_table, **options)
          end
        end