Question

我是django的新手。我正在阅读博客tutorial。从博客教程我无法理解以下部分。任何人都可以解释一下吗？我将非常感激。感谢

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]))

作者正在尝试为作者字段分配默认值（如果未传入）。

你可以通过制作POST QueryDict的可变副本来解决同样的问题，从而缩短代码。

这对你更有意义吗？

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

它检查使用表单评论的用户是否填写了表单（作者和正文）如果用户没有输入作者姓名，则会将其设置为匿名，如果两个字段（作者和正文）都为空，则会重定向回到表单..

任何人都可以解释一下django博客代码（详见里面）

2 个答案: