Django, ManyToMany field - django

Question

I have two models in my blog app:
class Tag(models.Model):
tag_name = models.CharField(max_length=20,
null=True)
def __str__(self):
return self.tag_name
class Post(models.Model):
tag = models.ManyToManyField(Tag, related_name="blog_tag",
blank=True)
In views i have:
tags = Tag.objects.all()
And
post = get_object_or_404(Post,
status="published",
publish__year=year,
publish__month=month,
publish__day=day,
slug=post)
So my question is - how can i filter tags by post ? I mean that i want to show only tags what i add to my post. I tried to do than in template , but something dosen't work :
{% for tag in tags %}
{% if tag in post %}
<div>
{{ tag.tag_name }}
</div>
{% endif %}
{% endfor %}
Post model:
class Post(models.Model):
STATUS_CHOICES = (
("draft", "Draft"),
("published", "Published"),
)
title = models.CharField(max_length=250)
slug = models.SlugField(max_length=250,
unique_for_date="publish")
author = models.ForeignKey(User,
related_name="blog_posts",
on_delete=models.CASCADE)
tag = models.ManyToManyField(Tag, related_name="blog_tag",
blank=True)
body = models.TextField()
publish = models.DateTimeField(default=timezone.now)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
status = models.CharField(max_length=10,
choices=STATUS_CHOICES,
default="draft")
image = models.ImageField(upload_to="blog/%Y/%m/%d",
blank=True)
class Meta:
ordering = ("-publish",)
def __str__(self):
return self.title
def get_absolute_url(self):
return reverse("blog:post_detail",
args=[self.publish.year,
self.publish.strftime("%m"),
self.publish.strftime("%d"),
self.slug])
The answer is:
{% for tag in post.tag.all %}
<div class="fa fa-plus-square">
{{ tag.tag_name }}
</div>
{% endfor %}

Answer 1

Since you're using a ManyToManyField in the Post class, it would be clearer if that field was called tags rather than tag, since it is referring to more than one thing.
class Post(models.Model):
tags = models.ManyToManyField(Tag, related_name="blog_tag",
blank=True)
So once you have looked up a post with:
post = get_object_or_404(Post,
status="published",
publish__year=year,
publish__month=month,
publish__day=day,
slug=post)
You pass it to the template with:
return render(request, 'post_detail.html', {'post': post})
And then in the post_detail.html you can render the tags associated with the post:
{% for tag in post.tags.all %}
<div>
{{ tag.tag_name }}
</div>
{% endfor %}
No need to explicitly filter the tags as the ManyToManyField handles that for you.

Answer 2

You can do this :
{%for tag in tags %}
{% if tag.id == post.tag.id%}
<div>
{{ tag.tag_name }}
</div>
{%endif%}
{%endfor%}