generate unique slug
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | from django.db import models
from django.utils.text import slugify
# Create your models here.
def get_unique_slug(value,model,slug_field='slug',max_length=None):
if max_length is None and hasattr(model._meta.get_field(slug_field),'max_length'):
max_length = model._meta.get_field(slug_field).max_length
slug = slugify(value)
num = 1
if max_length:
unique_slug = '{}-{}'.format(slug[:max_length - len(str(num)) - 1], num)
while model.objects.filter(** {slug_field: unique_slug}).exists():
unique_slug = '{}-{}'.format(slug[:max_length - len(str(num)) - 1], num)
num += 1
else:
unique_slug = '{}-{}'.format(slug, num)
while model.objects.filter(** {slug_field: unique_slug}).exists():
unique_slug = '{}-{}'.format(slug, num)
num += 1
return unique_slug
def fill_unique_slug(instance,value_field,slug_field='slug',max_length=None):
value = getattr(instance,value_field)
slug = get_unique_slug(value,instance.__class__,slug_field=slug_field,max_length=max_length)
setattr(instance,slug_field,slug)
class Post(models.Model):
name = models.CharField(max_length=255)
description = models.TextField()
# len =1
slug = models.SlugField(max_length=1, unique=True, blank=True, editable=False)
# len =2
slug2 = models.SlugField(max_length=3,blank=True, editable=False)
# no len
slug3 = models.SlugField(blank=True, editable=False)
# len =4
slug4 = models.SlugField(blank=True, editable=False)
def __str__(self):
return '%s | %s | %s | %s' %(self.slug,self.slug2,self.slug3,self.slug4)
def save(self, *args, **kwargs):
fill_unique_slug(self,'name')
fill_unique_slug(self,'name','slug2',max_length=2)
fill_unique_slug(self,'name','slug3')
fill_unique_slug(self,'name','slug4',max_length=4)
super().save(*args, **kwargs)
|
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