任何人都可以解釋我的django博客代碼（詳細內部）

Question

我是django的新手。我正在閱讀博客tutorial。從博客教程我無法理解以下部分。任何人都可以解釋我嗎？我將非常感激。感謝

from django.forms import ModelForm 

class CommentForm(ModelForm): 
    class Meta: 
     model = Comment 
     exclude = ["post"] 

    def add_comment(request, pk): 
     """Add a new comment.""" 
     p = request.POST 

     if p.has_key("body") and p["body"]: 
      author = "Anonymous" 
      if p["author"]: author = p["author"] 

      comment = Comment(post=Post.objects.get(pk=pk)) 
      cf = CommentForm(p, instance=comment) 
      cf.fields["author"].required = False 

      comment = cf.save(commit=False) 
      comment.author = author 
      comment.save() 
     return HttpResponseRedirect(reverse("dbe.blog.views.post", args=[pk])) 

Answer 1

class CommentForm(ModelForm): 
    class Meta: 
     model = Comment 
     exclude = ["post"] 

    def add_comment(request, pk): 
     """Add a new comment.""" 
     p = request.POST 

     # if POST has key "body" and p["body"] evalutes to True 
     if p.has_key("body") and p["body"]: # 


      author = "Anonymous" 
      # if the value for key "author" in p evaluates to True 
      # assign its value to the author variable. 
      if p["author"]: author = p["author"] 

      # create comment pointing to Post id: pk passed into this function 
      comment = Comment(post=Post.objects.get(pk=pk)) 

      # generate modelform to edit comment created above 
      cf = CommentForm(p, instance=comment) 
      cf.fields["author"].required = False 

      # use commit=False to return an unsaved comment instance 
      # presumably to add in the author when one hasn't been specified. 
      comment = cf.save(commit=False) 
      comment.author = author 
      comment.save() 
     return HttpResponseRedirect(reverse("dbe.blog.views.post", args=[pk])) 

筆者試圖如果不通過指定一個默認值作者字段。

你也許可以通過使一個可變的副本縮短代碼頗有幾分POSTQueryDict解決同樣的問題。

這對你更有意義嗎？

class CommentForm(ModelForm): 
    class Meta: 
     model = Comment 
     exclude = ["post"] 

    def add_comment(request, pk): 
     """Add a new comment.""" 
     p = request.POST.copy() 

     if p.has_key("body") and p["body"]: 
      if not p["author"]: 
       p["author"] = 'Anonymous' 

      comment = Comment(post=Post.objects.get(pk=pk)) 
      cf = CommentForm(p, instance=comment) 
      cf.save() 

     return HttpResponseRedirect(reverse("dbe.blog.views.post", args=[pk])) 

Answer 2

它檢查誰在使用形式評論的用戶填寫表單（作者和機構） 如果用戶沒有輸入作者姓名，將其設置爲匿名，且如果兩個字段（作者和正文）是空的，它將重定向回形式。