Setting an array in Rails params

Question

I have a multiselect dropdown that results in a redirect to URLs that include params like this:

period_id%5B%5D=14&period_id%5B%5D=15

In some circumstances, I need to set these params in my controller. I've tried

params[:period_id[]] = ['25']

and

params['period_id[]'] = ['25']

but this doesn't work.

What's the proper way to do this?

You want your controller to behave as if those params were passed to you or you're constructing a hash of params to pass to link_to (or similar) ? — Frederick Cheung
– Frederick Cheung, Commented Aug 11, 2014 at 18:08
I want the controller to behave as if those params were passed to it. — alpheus
– alpheus, Commented Aug 11, 2014 at 19:08

Filip Bartuzi · Accepted Answer · 2014-08-11 18:28:29Z

1

params is a standard ruby Hash so anything can be set as value.

try: params[:period_id] = [14,15,16...]

answered Aug 11, 2014 at 18:28

Filip Bartuzi

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2 Comments

alpheus Over a year ago

This doesn't work for me; when I read the params into an array, using params[:period_id].collect { |s| s.to_i }, they aren't returned in the same way as they are when they are supplied in the URL above.

Filip Bartuzi Over a year ago

Didn't understand you. Btw. there is shortcut for your .collect {|s| s.to_i} call. Do it this way: params[:period_id].collect(&:to_i)

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