merge!

# File activerecord/lib/active_record/relation/spawn_methods.rb, line 39
    def merge!(other) # :nodoc:
      if !other.is_a?(Relation) && other.respond_to?(:to_proc)
        instance_exec(&other)
      else
        klass = other.is_a?(Hash) ? Relation::HashMerger : Relation::Merger
        klass.new(self, other).merge
      end
    end