Verify presence_of parameter

rubyonrails-talk
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

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"

You need an else in here

Colin

3

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...)