自动发票在django后端发票新的发票 [英] Auto increament the invoice number in django backend for new invoice

问题描述

我想自动发送3位数字字符和4位数的发票号码。

 类发票：
 invoice_no = models.CharField（max_length = 500，null = True，blank = True，validators = [RegexValidator（regex ='^ [a-zA-Z0-9] * $'，message ='发票必须为字母数字' ，code ='invalid_invoice number'），]）
  

我在后端注册这个模型。但现在当我点击管理员的创建发票时，发票应该是自动填充的。当我再次点击管理员中的新发票时，发票号应增加1，应为自动字段。

发票编号MAG0001，MAG0002，MAG0003等，当我点击创建新发票时，这应该是admin中的auto field。

解决方案

定义一个函数来生成发票号码。 $ p $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ ）
如果不是last_invoice：
返回'MAG0001'
invoice_no = last_invoice.invoice_no
invoice_int = int（invoice_no.split（'MAG'）[ - 1]）$ ​​b $ b new_invoice_int = invoice_int + 1
new_invoice_no ='MAG'+ str（new_invoice_int）
返回new_invoice_no

现在使用此函数作为模型库中的默认值。

  invoice_no = models.CharField（max_length = 500 ，default = increment_invoice _number，null = True，blank = True）
  

这只是一个想法。修改功能以匹配您首选的发票编号格式。

I want to auto increament the invoice number which is 3 digits char and 4 digits number.

class Invoice:
    invoice_no = models.CharField(max_length=500, null=True, blank=True, validators=[RegexValidator(regex='^[a-zA-Z0-9]*$',message='Invoice must be Alphanumeric',code='invalid_invoice number'),])

I register this model in backend. But now when i click on create invoice in admin the invoice should be auto filled. When i again click on create new invoice in admin, the invoice_number should be incremented by one and should be auto field.

Ex for Invoice number MAG0001, MAG0002, MAG0003 etc and this should be auto field in admin when i click on create new invoice.

解决方案

Define a function to generate invoice number.

def increment_invoice_number():
    last_invoice = Invoice.objects.all().order_by('id').last()
    if not last_invoice:
         return 'MAG0001'
    invoice_no = last_invoice.invoice_no
    invoice_int = int(invoice_no.split('MAG')[-1])
    new_invoice_int = invoice_int + 1
    new_invoice_no = 'MAG' + str(new_invoice_int)
    return new_invoice_no

Now use this function as default value in your model filed.

invoice_no = models.CharField(max_length = 500, default = increment_invoice_number, null = True, blank = True)

This is just an idea. Modify the function to match your preferred invoice number format.

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