Python 为什么会出现空约束错误?
我试图给事实(帖子)添加评论。当我试图提交评论时,会出现以下错误?我正在使用Postgres供参考Python 为什么会出现空约束错误?,python,django,postgresql,Python,Django,Postgresql,我试图给事实(帖子)添加评论。当我试图提交评论时,会出现以下错误?我正在使用Postgres供参考 IntegrityError at /fc/2/comment/ null value in column "comment_id" violates not-null constraint DETAIL: Failing row contains (8, It has plugins too, 2018-10-03 07:41:25.249524+00, 1, null). Exceptio
IntegrityError at /fc/2/comment/
null value in column "comment_id" violates not-null constraint
DETAIL: Failing row contains (8, It has plugins too, 2018-10-03 07:41:25.249524+00, 1, null).
Exception Value:
null value in column "comment_id" violates not-null constraint
DETAIL: Failing row contains (8, It has plugins too, 2018-10-03 07:41:25.249524+00, 1, null).
型号:
class Fact(models.Model):
author = models.ForeignKey('auth.User', on_delete=models.CASCADE)
title = models.CharField(max_length=200)
text = models.TextField()
created_date = models.DateTimeField(
default=timezone.now)
published_date = models.DateTimeField(
blank=True, null=True)
def publish(self):
self.published_date = timezone.now()
self.save()
def __str__(self):
return self.title
class Comment(models.Model):
author = models.ForeignKey('auth.User', on_delete=models.CASCADE)
comment = models.ForeignKey('fc.Fact', on_delete=models.CASCADE, related_name='comments')
text = models.TextField()
created_date = models.DateTimeField(default=timezone.now)
视图:
表单视图:
{% extends 'base.html' %}
{% block content %}
<h1>Check this fact</h1>
<form method="POST" class="post-form">{% csrf_token %}
{{ form.as_p }}
<button type="submit" class="save btn btn-default">Save</button>
</form>
{% endblock %}
为什么注释id为空,我本以为Django会像我的事实模型那样自动填充它
谢谢你在这方面的帮助
谢谢。应该是
comment.comment = fc
因此,你的观点将是正确的
def add_comment_to_post(request, pk):
fc = get_object_or_404(Fact, pk=pk)
if request.method == "POST":
form = CommentForm(request.POST)
if form.is_valid():
comment = form.save(commit=False)
comment.comment = fc # change is here <<<
comment.save()
return redirect('fc_detail', pk=fc.pk)
else:
form = CommentForm()
return render(request, 'add_comment_to_post.html', {'form': form})
def将注释添加到帖子(请求,主键):
fc=获取对象或404(事实,pk=pk)
如果request.method==“POST”:
表单=评论表单(request.POST)
如果form.is_有效():
comment=form.save(commit=False)
comment.comment=fc#变化就在这里应该是这样的
comment.comment = fc
因此,你的观点将是正确的
def add_comment_to_post(request, pk):
fc = get_object_or_404(Fact, pk=pk)
if request.method == "POST":
form = CommentForm(request.POST)
if form.is_valid():
comment = form.save(commit=False)
comment.comment = fc # change is here <<<
comment.save()
return redirect('fc_detail', pk=fc.pk)
else:
form = CommentForm()
return render(request, 'add_comment_to_post.html', {'form': form})
def将注释添加到帖子(请求,主键):
fc=获取对象或404(事实,pk=pk)
如果request.method==“POST”:
表单=评论表单(request.POST)
如果form.is_有效():
comment=form.save(commit=False)
comment.comment=fc#变化就在这里,非常完美,谢谢。Is comment.comment=comment\u id?comment.comment
需要一个整数,表示有效的Fact
实例或有效的Fact
实例的PK值。除此之外,comment
和comment\u id
几乎相同,都表示FK关系完美,谢谢。Is comment.comment=comment\u id?comment.comment
需要一个整数,表示有效的Fact
实例或有效的Fact
instanceMoreover的PK值,comment
和comment\u id
几乎相同,都表示FK关系
def add_comment_to_post(request, pk):
fc = get_object_or_404(Fact, pk=pk)
if request.method == "POST":
form = CommentForm(request.POST)
if form.is_valid():
comment = form.save(commit=False)
comment.comment = fc # change is here <<<
comment.save()
return redirect('fc_detail', pk=fc.pk)
else:
form = CommentForm()
return render(request, 'add_comment_to_post.html', {'form': form})