avail.rb

  def process_available_days(p)
    [0,1,0,1,0,1,0]
  end 

  def prepare_params(p)
    p[:available_days] = process_available_days(p[:available_days])
    p.except(:branches_deals)
  end 

  def create
    deals_parameters = prepare_params(deal_params)
    @deal = Deal.new(deals_parameters)

    if @deal.save
      render json: @deal, status: :created, location: @deal
    else
      render json: @deal.errors, status: :unprocessable_entity
    end
  end