Question

我是Django的新手。我正在尝试检查字段“组”是否存在于db中。所以，我想在'group'字段中使用带有多个参数的验证器。我正在使用generic.CreateView。这是我的代码：

models.py ：

from django.db import models
from django.urls import reverse
from django.utils.text import slugify
from .validators import valid_group

class Blood(models.Model):
    A_POSITIVE = 'A_positive'
    A_NEGATIVE = 'A_negative'
    B_POSITIVE = 'B_positive'
    B_NEGATIVE = 'B_negative'
    AB_POSITIVE = 'AB_positive'
    AB_NEGATIVE = 'AB_negative'
    O_POSITIVE = 'O_positive'
    O_NEGATIVE = 'O_negative'
    choices = [
        (A_POSITIVE, 'A+'),
        (A_NEGATIVE, 'A-'),
        (B_POSITIVE, 'B+'),
        (B_NEGATIVE, 'B-'),
        (AB_POSITIVE, 'AB+'),
        (AB_NEGATIVE, 'AB-'),
        (O_POSITIVE, 'O+'),
        (O_NEGATIVE, 'O-'),
    ]
    bank = models.ForeignKey(Bank, on_delete=models.CASCADE)
    group = models.CharField(
        choices=choices, max_length=11, db_index=True, validators=[valid_group])
    slug = models.SlugField(max_length=100, db_index=True, unique=True)
    description = models.TextField(blank=True)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    available = models.BooleanField(default=False)
    stock = models.PositiveIntegerField(default=0)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ('group',)
        index_together = (('id', 'slug'),)

    def clean(self, *args, **kwargs):
        return valid_group(self.group, self.bank)

    def save(self, *args, **kwargs):
        self.slug = slugify(self.bank.name+self.group)
        super(Blood, self).save(*args, **kwargs)

validators.py ：



def valid_group(group, bank):
    print(bank, group)
    if group and bank.blood_set.filter(group=group).exists():
        return ValidationError('Try to add different group')

views.py ：


from django.shortcuts import render
from django.views import generic
from .models import Bank, Blood
from django import forms

class BloodCreateView(generic.CreateView):
    model = Blood
    template_name = "blood/blood_form.html"
    fields = ['group', 'description', 'price', 'stock', 'available']

    def form_valid(self, form):
        bank_id = self.kwargs.get('pk')
        # print(bank_id)
        form.instance.bank_id = bank_id
        group = form.cleaned_data.get('group')
        if group and Bank.objects.get(pk=bank_id).blood_set.filter(group=group).exists():
            return forms.ValidationError('Try to add different group')

        return super(BloodCreateView, self).form_valid(form)

urls.py：

from django.urls import path, include
from .models import Bank, Blood
from . import views

app_name = 'blood'


urlpatterns = [
         path('bank/<int:pk>/create/',
         views.BloodCreateView.as_view(), name='blood-create')
]

我可以通过这种方式解决问题，以便在验证器中使用多个参数吗？

valid_group（）缺少1个必需的位置参数：“ bank”

0 个答案: