How to customise unique = true in django - django

Question

ok basically, users on my website can create blogposts. But I do not want to use unique = True because that'll mean that user1 cannot create a post that has the same title as user2.
I want to make it such that user1 can create a post that has the same title as user2 BUT user1 CANNOT create another post with the same name as any existing post that USER1 has previously created.
Meaning user 1 can have a blogpost title "hello" and user 2 can also have a blogpost "hello"
but user 1 cannot have 2 blogpost with the same title 'hello'
Ok i think this is clear enough^....if I use unique = true, this would be too much, so how can I customise that such that it only applies to the user's post? Thanks!
models.py
class BlogPost(models.Model):
title = models.CharField(max_length=50, null=False, blank=False, unique=True)
author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
slug = models.SlugField(blank=True, unique=True)
class Account(AbstractBaseUser):
email = models.EmailField(verbose_name="email", max_length=60, unique=True)
username = models.CharField(max_length=30, unique=True)
forms.py
class CreateBlogPostForm(forms.ModelForm):
class Meta:
model = BlogPost
fields = ['chief_title']
html
<form class="create-form" method="post" enctype="multipart/form-data">{% csrf_token %}
<div class="form-group">
<label for="id_title">Title</label>
<input class="form-control" type="text" name="title" id="id_title" placeholder="Title" required autofocus>
</div>
<button class="submit-button btn btn-lg btn-primary btn-block" type="submit">Submit</button>
</form>
{% if form.errors %}
{% for field in form %}
{% for error in field.errors %}
<div class="alert alert-danger">
<strong>{{ error|escape }}</strong>
</div>
{% endfor %}
{% endif %}
views.py
def create_blog_view(request):
context = {}
user = request.user
if request.method == 'POST':
form = CreateBlogPostForm(request.POST or None, request.FILES or None)
if form.is_valid():
obj.save()
return redirect('HomeFeed:main')
else:
context['form'] = form
return render(request, "HomeFeed/create_blog.html", context)

Answer 1

you could use a unique constraint, this allows 2 fields to interact and be unique so you could have a post name that can only be used once per user