Params key

Hi there,

What is the best way to see if a certain key exists in my params hash in
my controller?

Thanks,
steve

params.has_key?(:the_key)

Just print it out…

pp params

But a word of caution - do remove the pp line in production mode as this
can
bring your app down to its knees - “something went wrong”…

In your view, you can do <%= debug(params) %> to see that what all’s
there
in the params hash.

:slight_smile:
Maku
http://www.apnabill.com

On Thu, Mar 27, 2008 at 8:49 PM, Steve G. <

Steve G. wrote:

What is the best way to see if a certain key exists in my params hash in
my controller?

params.has_key?(key)

Now read your Ruby tutorial for a little while!

And note that has_key? is sometimes only an intermediate solution, where
you
might really need the more compact expression:

params.fetch(key, ‘default value’)


Phlip

मयंक जैन (makuchaku) wrote:

Just print it out…

pp params

Despite you may have answered the wrong question, it bears repeating
here that
nothing compares to this savage technique:

raise params.inspect

Bam - a browser full of nothing but your params. And a stack dump!


Phlip

On Thu, Mar 27, 2008 at 9:18 PM, Phlip [email protected] wrote:

raise params.inspect

Bam - a browser full of nothing but your params. And a stack dump!

I do agree that it dumps everything - but at times it helps in
debugging…

  • but yes, point taken :slight_smile:


Maku

Thanks for the tips guys but I am not trying to debug so printing
doesn’t help. I actually have conditional logic in my controller that
depends upon whether or not the key is in the hash. So far the first
solution seems to work.

Phlip wrote:

मयंक जैन (makuchaku) wrote:

Just print it out…

pp params

Despite you may have answered the wrong question, it bears repeating
here that
nothing compares to this savage technique:

raise params.inspect

Bam - a browser full of nothing but your params. And a stack dump!


Phlip

If you’re looking for one key in particular, you can always:

…do stuff… if params[:certain_key]

Check for empty values if needed.

-Kyle

Steve G. wrote:

Thanks for the tips guys but I am not trying to debug so printing
doesn’t help. I actually have conditional logic in my controller that
depends upon whether or not the key is in the hash. So far the first
solution seems to work.

Are you sure you shouldn’t just use two different routes? Sometimes
routes are
better than extra ?key=value&… parameters!


Phlip

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