Verify presence_of parameter

Rails
1

I would like to verify a parameter is present before a search is posted.

min_age = params[:min_age]
max_age = params[:max_age]

@users = User.find(:all,
:conditions => ["years >= ? AND years <= ? " min_age,
max_age])

Basically I am just concerned about the max_age.

I tried this:
min_age = params[:min_age]
max_age = params[:max_age]

if max_age.nil?
flash[:notice] = “please enter max age!”
redirect_to :action => “index”

@users = User.find(:all,
:conditions => ["years >= ? AND years <= ? " min_age,
max_age])

But the search still ran with a nil max_age parameter.

2

On 15 February 2010 03:07, Sean S. [email protected] wrote:

I tried this:
min_age = params[:min_age]
max_age = params[:max_age]

if max_age.nil?
flash[:notice] = “please enter max age!”
redirect_to :action => “index”

You need an else in here

Colin

3

On 15 February 2010 03:07, Sean S. [email protected] wrote:

I tried this:
min_age = params[:min_age]
max_age = params[:max_age]

if max_age.nil?
flash[:notice] = “please enter max age!”

If there is a field called “max_age” on the form, but the user leaves
it blank, you won’t get nil from params, you’ll get an empty string.

So if you check for max_age.blank? instead, you should get the result
you want.

(Running a debugger would help you find this out very easily, or even
just outputting the value of max_age to the console to see if it’s
what you expect it to be…)