Django Rest Framework return True if relation exist
<p>I have two questions. How i can just return true if relation exist? For example I have post model and comment model also, comment have foreginKey to post. Now after post serialization i wanna have something like this </p>

<pre><code>{
id: 2
content: "My first post!"
has-comments: True
}
</code></pre>

<p>And my second question is how rename field name in model relation? Again we have post and comment. In comment model i have foregin key to post like </p>

<pre><code>post = models.ForeignKey(Post)
</code></pre>

<p>Now when i add new comment i send JSON data with {post: postIdHere}. Is possible to change post to postId only in drf not in django model?</p>

<p>I hope you understand me :)
Best Redgards,
Sierran.</p>