如何使Django表單中的實體具有多個值？

我正在制作一個 Django 博客，我想讓用戶編輯他的帖子。我有 2 個表單要呈現，包含（標題、帖子影像、內容、類別）的帖子表單和包含（標簽名稱）的帖子標簽的另一個單獨的表單。要編輯標簽，我必須獲取與帖子相關的所有標簽并將它們設定為instance只接受一個物件的屬性（并且我有多個標簽用于一篇帖子）。這是我的模型：

class PostTags(models.Model):
    tag_name = models.CharField(max_length=100)

    def __str__(self):
        return self.tag_name

class Post(models.Model):
    title = models.CharField(max_length=50)
    picture = models.ImageField(null=True,upload_to='images/')
    content = models.CharField(max_length=255)
    likes = models.ManyToManyField(User,blank=True,related_name='likes')
    dislikes = models.ManyToManyField(User,blank=True,related_name='dislikes')
    date_of_publish = models.DateTimeField(auto_now_add=True,null=True,blank=True)
    user = models.ForeignKey(User,on_delete=models.CASCADE)
    category = models.ForeignKey(Category,on_delete=models.CASCADE)
    tag = models.ManyToManyField(PostTags,blank=True)
      
    def __str__(self):
        return self.title

這是我的表格：

class PostForm(forms.ModelForm):
    class Meta:
        model = Post
        fields = ['title','picture','content','category']
        widgets = {
            'title': forms.TextInput(attrs={'class': 'form-control'}),
            'picture': forms.FileInput(attrs={'class': 'form-control'}),
            'content':forms.TextInput(attrs={'class': 'form-control'}),
            'category' : forms.Select(attrs={'class':'form-control'}),
        }

class TagsForm(forms.ModelForm):
    class Meta:
        model = PostTags
        fields = ['tag_name']
        widgets = {
            'tag_name': forms.TextInput(attrs={'class': 'form-control', 'data-role': 'tagsinput'})
        }

這是我嘗試在views.py中獲取標簽表單中的所有標簽

def editPost(request,post_id):
    post = Post.objects.get(id= post_id)
    post_form = PostForm(instance=post)
    # tagInstance = []
    for tag in post.tag.all():
        print(tag)
        newTag = PostTags.objects.get(tag_name=tag)
        tag_form = TagsForm(instance=newTag)
        # tagInstance.append(newTag)
 
    # print(tagInstance)
    
    
    # if request.method == 'POST':
    #     form = PostForm(request.POST,instance=post)
    #     if form.is_valid():
    #         form.save()
    #         return redirect('post')
    context = {"post_form":post_form,'tag_form':tag_form}
    return render (request,"dj_admin/editpost.html",context)

上述嘗試僅導致最后一個標簽呈現給預期的標簽形式

uj5u.com熱心網友回復：

可能有一個更清潔的解決方案，但這應該有效：

def editPost(request,post_id):
    post = Post.objects.get(id= post_id)
    post_form = PostForm(instance=post)
    context = {}
    context['post_form'] = post_form
    count = 0
    for tag in post.tag.all():
        print(tag)
        newTag = PostTags.objects.get(tag_name=tag)
        tag_form = TagsForm(instance=newTag)
        count  = 1
        context['tag_form' str(count)] = TagsForm(instance=newTag)
    context['tag_form_counter'] = count
    return render (request,"dj_admin/editpost.html",context)

因此，在您的模板中，您必須檢查 tag_form_counter 變數以了解您擁有多少個 tag_forms。并制作一個 forloop 來展示它們。

uj5u.com熱心網友回復：

如果我理解正確，您希望在模板中呈現與帖子相關的所有 tag_forms。

您可以使用django 模型 inline_formsets實作您想要的

表格.py：

from django.forms import inlineformset_factory
from .models import Post, PostTags

class PostForm(forms.ModelForm):
    class Meta:
        model = Post
        fields = ['title','picture','content','category']
        widgets = {
            'title': forms.TextInput(attrs={'class': 'form-control'}),
            'picture': forms.FileInput(attrs={'class': 'form-control'}),
            'content':forms.TextInput(attrs={'class': 'form-control'}),
            'category' : forms.Select(attrs={'class':'form-control'}),
        }

class TagsForm(forms.ModelForm):
    class Meta:
        model = PostTags
        fields = ['tag_name']
        widgets = {
            'tag_name': forms.TextInput(attrs={'class': 'form-control', 'data-role': 'tagsinput'})
        }

TagFormSet = inlineformset_factory(PostTags, Post, fields=('tag_name',))

視圖.py：

from .forms import PostForm, TagsForm, TagFormSet

def editPost(request,post_id):
    post = Post.objects.get(id= post_id)
    post_form = PostForm(instance=post)
    tag_formset = TagFormSet(instance=post)     
    
    if request.method == 'POST':
        form = PostForm(request.POST, instance=post)
        tag_formset = TagFormSet(request.POST, instance=post)
        if form.is_valid() and tag_formset.is_valid():
            form.save()
            tag_formset.save()
            return redirect('post')
    context = {'post_form': post_form, 'tag_formset': tag_formset}
    return render (request, 'dj_admin/editpost.html', context)

然后在您的模板檔案中，您可以{{ tag_formset }}像這樣簡單地添加：

<form method="post">
    {{ formset }}
</form>

標籤：django django模型 django-views django-forms django-模板

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