Django标签系统

Question

这里我有代码，我想创建一个post或类别，当我已经创建并发送到数据库的标记时，我不想创建一个新的标记，标记下面的代码是重复的。

class Post(models.Model):
    post = models.CharField(max_length=50)

class Tag(models.Model):
    tag = models.CharField(max_length=50)
    tags = models.ManyToManyField(Post, through="Tagging")

class Tagging(models.Model):
    posts = models.ForeignKey(Post, on_delete=models.CASCADE)
    taggings = models.ForeignKey(Tag, on_delete=models.CASCADE)

def index(request):
    if request.method == "POST":
        post = request.POST['post']
        tag = request.POST['tag']
        posts = Post.objects.create(post=post)
        tags = Tag.objects.create(tag=tag)
        tp = Tagging(posts=posts, taggings=tags)
        tp.save()
        return redirect('index')
    return render(request, 'index.html')

如何标记不重复？

Answer 1

可以使用get_or_create方法避免创建重复项。此外，我认为您应该将ManyToMany字段移到Post模型中。

models.py

from django.db import models


class Tag(models.Model):
    tag = models.CharField(max_length=50)

class Post(models.Model):
    post = models.CharField(max_length=50)
    tags = models.ManyToManyField('Tag', through="Tagging")

class Tagging(models.Model):
    posts = models.ForeignKey('Post', on_delete=models.CASCADE)
    taggings = models.ForeignKey('Tag', on_delete=models.CASCADE)

views.py

from django.shortcuts import render, redirect
from .models import Post, Tag, Tagging


def index(request):
    if request.method == "POST":
        post = request.POST['post']
        tag = request.POST['tag']
        posts = Post.objects.create(post=post)
        tags, created = Tag.objects.get_or_create(tag=tag)
        tp = Tagging(posts=posts, taggings=tags)
        tp.save()
        return redirect('index')
    return render(request, 'index.html')