class Machine(models.Model):
    serial = models.CharField(max_length=30,  blank=True, null=True)
    client = models.ForeignKey(Client,   related_name="machines")
#    customer = models.ForeignKey(Client,  blank=True, null=True,  related_name="machines_customer")
    alias = models.CharField(max_length=30, blank=True)
    machinemark = models.ForeignKey(MachineMark)
    month = models.IntegerField()
    motohours = models.IntegerField()

class MachineAdmin(admin.ModelAdmin):
    inlines = [#ReportInline, \
#               FixInline, \
#               MaintenanceInline, \
#               CheckupInline, \
#               UploadInline, \
               ]

@register.filter(name='rstrip_inline_formset')
def rstrip_inline_formset(value, args):
    
    count = 0
    for form in value:
        count += 1
    
    i = 0
    result = []
    for form in value:
        i += 1
        if i>count-args:
            break
        result.append(form)
        
    return result