Django formset hidden id field

Hello,

I have a formset and when I render it, Django would include this line in the HTML:

<input id="id_form-0-id" name="form-0-id" type="hidden">

I am curious what is the purpose of having an id field here. 

I mean in what situation would you use it. I did look through Django's documentation on formsetbut cannot find much documentation on this.

One answer I got is that this id field is the value of the primary key of the model bound to this form. It is there so that when the formset updates, people can use it to retrieve the corresponding record from the database.

Is the above explaination correct?

If this explaination is correct, then my next question is, wouldn't it be dangerous to expose the primary key like that? I can make a post call to your server with a modified pk which can mess up your database.

Thank you!

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