Django pass PK from post to next page - django

Question

I currently have a blog post feature on my site. I want users to be able to create sub posts
(build log ) off of the main posts.
I created this model with a FK to the Post model
class BuildLog(models.Model):
title = models.CharField(max_length=100)
content = RichTextUploadingField(blank=True, null=True)
date_posted = models.DateTimeField(default=timezone.now)
author = models.ForeignKey(User, on_delete=models.CASCADE)
post = models.ForeignKey('Post', on_delete=models.CASCADE)
I then added a button on the post page and created a form. Everything is working as expected but when I submit the form I get the error
null value in column "post_id" of relation "blog_buildlog" violates not-null constraint
If I understand the error correctly it is saying I am not passing the PK of the post into the form.
Views
def DetailPostView(request, pk):
model = Post
post = Post.objects.get(pk=pk)
form = CommentForm
comments = Comment.objects.filter(post=post)#.order_by('-create')
if request.method == 'POST':
# A comment was posted
comment_form = CommentForm(data=request.POST)
if comment_form.is_valid():
new_comment = comment_form.save(commit=False)
new_comment.author = request.user
new_comment.post = post
new_comment.save()
context = {
'post':post, 'form':form, 'comments':comments
}
return render(request, 'blog/post_detail.html', context)
class BuildLogView(LoginRequiredMixin, CreateView):
model = BuildLog
form_class = BuildLogForm
def form_valid(self, form):
form.instance.author = self.request.user
return super().form_valid(form)
def save(self, *args, **kwargs):
super(BuildLog,self).save(*args, **kwargs)
Url
path('build-log-form/', BuildLogView.as_view(), name='build-log-form'),
path('post/<int:pk>/', views.DetailPostView, name='post-detail')
How do I go about passing the post PK into the next view?
forms.py
class BuildLogForm(ModelForm):
class Meta:
model = BuildLog
fields = ['title' , 'content']
html
{% extends "blog/base.html" %}
{% load crispy_forms_tags %}
{% block content %}
<div class="content-section">
<form method="post" enctype="multipart/form-data" id="PostForm" novalidate>
<!--id="modelForm"-->
{% csrf_token %}
<fieldset class="django-ckeditor-widget">
<legend class="border-bottom mb-4">New Build Log</legend>
{{ form.title | as_crispy_field }}
{{ form.media }}
{{ form.content | as_crispy_field | safe}}
</fieldset>
<div class="form-group">
<button class="btn btn-outline-info" type="submit">Post</button>
</div>
</form>
</div>
{% endblock content %}
Just incase their is any confusing It goes Post --> BuildLog(subpost)