repositions_account_collection.rb

module RepositionsAccountCollection

  def update
    if reposition.valid?
      reposition.perform and render nothing: true, status: :ok
    else
      render json: reposition.errors.to_json, status: :unprocessable_entity
    end
  end

  private

  def reposition
    @reposition ||= AccountReposition.new({
      account: current_account,
      collection_type: params[:collection_type],
      positions: params[:positions]
    })
  end

end