Did you look in the params hash that is sent from your form when you submit it? 
What's the very last element in the params (usually, and in a scaffolded demo, 
always)? Note: I am speaking of the params you would get in an update (PATCH), 
not a create (POST), as you asked specifically about the id, and a POST won't 
have one of those.

Walter

> On Jun 4, 2018, at 4:31 AM, fugee ohu <fugee...@gmail.com> wrote:
> 
> How do forms pass the id to the controller in normal basic scaffolding? 
> There's no id field in the form, there's no magic that passes the form's 
> container object to the controller, rather every parameter is explicity 
> provided in input fields of the form, except the id, so how does the id get 
> passed to the controller? Something in the forms syntax extracts the id from 
> the @object and puts it in the form but i dunno what Thanks in advance
> 
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