添加模型有關的ModelForm節約

Question

models.py

from django.db import models 

class Author(models.Model): 
    name = models.CharField(max_length=32) 

class Article(models.Model): 
    author = models.ForeignKey(Author, on_delete=models.SET_NULL, null=True) 
    content = models.TextField() 

forms.py

from django import forms 
from .models import Article 

class ArticleForm(forms.ModelForm): 
    class Meta: 
     model = Article 
     fields = ['content'] 

在我的web應用程序，筆者日誌之前，寫一篇文章。很明顯，當作者看到ArticleForm時，他/她不需要填寫ArticleForm中的作者字段，因爲應用程序已經通過使用會話變量知道作者是誰。

這是我嘗試添加筆者方式：

views.py

from django.shortcuts import render, redirect, get_object_or_404 
from django.contrib.auth.decorators import login_required 

from .models import Article 
from .forms import ArticleForm 

@login_required 
def new_article(request): 
    author_name = request.session['author_name'] 
    author = Author.objects.get(name=author_name) 

    if request.method == 'POST': 
     form = ArticleForm(request.POST) 
     if form.is_valid(): 
      form.save(commit=False) 
      form.author = author # I suspect the mistake is here 
      # I also tried form.author = author.id 
      form.save() 
      return redirect('success') 
    else: 
     form = ArticleForm() 

    return render(request, 'writings/new_article.html', {'form': form}) 

當我看到數據庫表中，AUTHOR_ID列始終NULL。我的方法有什麼問題？如何在保存ModelForm之前添加模型關係？

Answer 1

捕獲從form.save(commit=False)返回的對象並修改該對象而不是表單。 EG：

if form.is_valid(): 
    article = form.save(commit=False) 
    article.author = author 
    article.save() 
    return redirect('success')