def fix_shopify_fees():
    # weren't getting calc'd from 15th Sep to 28th Oct
    to_fix = Sale.objects.filter(channel__label='SHOPIFY').filter(sale_date__gte='2016-09-15')
    for s in to_fix:
        s.channel_charges = shopify_fee(s)
        s.save()
    return
def add_shopify_fees():
    for s in Sale.objects.filter(channel__label='SHOPIFY'):
        s.channel_charges = shopify_fee(s)
        s.save()
    return