Forum: Ruby on Rails Question about Rails-formatted query params in URL

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Brian H. (Guest)
on 2009-05-29 18:04
Hi all,

I am seeing a behavior for which I can't find documentation.  I am
posting a form to a url with query params formatted in the Rails manner:

/controller/action?foo[bar]=3  # Of course, the brackets are properly

When doing this, the actual form fields get lost, e.g.

params[:foo] # This gives {:bar => 3}

even though the form has other fields for foo.

Any ideas?

Thanks so much,

Brian H.
Colin L. (Guest)
on 2009-05-30 11:24
(Received via mailing list)
What is shown in the log file for the parameters for the request? You
see data
Processing YourController#method ... Parameters: .....


2009/5/29 Brian H. <removed_email_address@domain.invalid>
Frederick C. (Guest)
on 2009-05-30 11:33
(Received via mailing list)
On May 29, 3:04 pm, Brian H. <removed_email_address@domain.invalid>
> params[:foo] # This gives {:bar => 3}
> even though the form has other fields for foo.

so params[:foo] is being populated partially from parameters in the
URL, partially from form parameters ? Some of the parameter parsing
stuff changed in 2.3.2 so if you are using 2.3.2 would be interesting
to see if this is a regression.

Brian H. (Guest)
on 2009-06-02 23:25
Now that I've done a bit more testing, I think this is simply a
namespace collision.  I think that query parameters and form parameters
share a namespace (the request), and it's reasonable to have weird or
undefined behavior when there is a collision.  It seems like Rails
behavior is to handle the form params first, putting them in the
'params' hash, then handle the query params.  The Hash class' behavior
would dictate a 'last in wins' behavior, which is consistent with what
I'm seeing.

I found that I don't really have to encode that parameter in the URL,
which solves my immediate problem.

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