创建独特的 slug django [英] create unique slug django

问题描述

我在使用 django 模型创建独特的 slug 时遇到问题.我想允许管理员用户从管理员的编辑页面更改 slug.当 slug 已经存在时，应该有slug + _1"、slug + _2"等.此外，当创建一个新页面并且没有 slug 时，slug 应该是页面标题.我有这个代码，但出于某种原因，管理员一直说带有这个 Slug 的页面已经存在".当我添加一个带有已经存在的 slug 的页面时.希望有人能帮助我

I have a problem with creating unique slugs using django models. I want to allow the admin user to change the slug from the edit page in the admin. When a slug already exists there should be "slug + _1", "slug + _2" etc. Also when a new page is created and there is no slug given the slug should be the page title. I have this code but for some reason the admin keeps saying "Page with this Slug already exists." when I add a page with a slug that already exists. Hope somebody can help me

def save(self, *args, **kwargs):
    if not self.id and not self.slug:
        self.slug = slugify(self.page_title)

    else:
        self.slug = slugify(self.slug)

    slug_exists = True
    counter = 1
    slug = self.slug
    while slug_exists:
        try:
            slug_exits = Page.objects.get(slug=slug)
            if slug_exits == slug:
                slug = self.slug + '_' + str(counter)
                counter += 1
        except:
            self.slug = slug
            break
    super(Page, self).save(*args, **kwargs)

推荐答案

试试这个.自己没测试过.但它应该给你这个想法.

Try this. Didn't test it myself. But it should give you the idea.

import re
def save(self, *args, **kwargs):
    if not self.id: # Create
        if not self.slug: # slug is blank
            self.slug = slugify(self.page_title)
        else: # slug is not blank
            self.slug = slugify(self.slug)
    else: # Update
        self.slug = slugify(self.slug)

    qsSimilarName = Page.objects.filter(slug__startswith='self.slug')

    if qsSimilarName.count() > 0:
        seqs = []
        for qs in qsSimilarName:
            seq = re.findall(r'{0:s}_(\d+)'.format(self.slug), qs.slug)
            if seq: seqs.append(int(seq[0]))

        if seqs: self.slug = '{0:s}_{1:d}'.format(self.slug, max(seqs)+1)

    super(Page, self).save(*args, **kwargs)

您的代码中存在三个问题.

Three problems in your code.

1. 第一个 else 表示 self.id 或 self.slug 不为空.因此，如果 self.id 不为空且 self.slug 为空，self.slug 将不会获得值.
2. slug_exits == slug 将始终为 False，因为 slug_exits 是一个模型对象，而 slug 是一个字符串.这就是您收到错误的原因！
3. 您在循环中执行了查询，这可能会导致对数据库的大量命中.

1. The first else means either self.id or self.slug is NOT blank. So if self.id is NOT blank and self.slug is blank, self.slug will not get a value.
2. slug_exits == slug will always be False, because slug_exits is a Model object and slug is a string. This is why you get the error!
3. You did a query in the loop, which may cause lots of hits to the DB.

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