update_or_create.rb

  # PUT /buckets/Animals
  # PUT /buckets/Animals.json
  # Used for creating and updating buckets
  # view the features located at /features/buckets.*.feature
  # for details on the design of this method.
  def update
    @bucket = Bucket.find_or_new_by_name params[:id]
    if @bucket.new_record?
      if @bucket.save
        respond_to do |format|
          format.html do
            flash[:success] = "Bucket was successfully created."
            redirect_to @bucket
          end
          format.json{ render :json => '', :status => 201 }
        end
      else
        respond_to do |format|
          format.html{ render :action => :new }
          format.json{ render :json => '', :status => 500 }
        end
      end
    else
      if @bucket.update_attributes(params[:bucket])
        respond_to do |format|
          format.html do
            flash[:success] = "Bucket was successfully updated."
            redirect_to @bucket
          end
          format.json{ render :json => @bucket, :status => 200 }
        end
      else
        respond_to do |format|
          format.html{ render :action => :edit }
          format.json{ render :json => '', :status => 500 }
        end
      end
    end
  end