server/lib/helpers/helpers.rb
helpers do
def set_day_month
valid_date_filter(params[:day].to_i, params[:month].to_i)
@day_month = DayMonth.find_by(day: params[:day], month: params[:month])
end
def valid_date_filter(day, month)
return if DayMonth.valid_date?(day, month)
halt 400, json(error: 'Not a valid request.')
end
end