Validating Integers

rubyonrails-talk
1

Naga harish Kanegolla wrote:

Hi all,    Is there a way to do validation such as if i enter a string i should get an alert saying it is a string enter number, I can use validates_numericality_of but its ajax form, so i can't get the message there.

So i am trying to validate by form field saying that

if @project.project_number!= ~ /^[0-9]+$/ render :update do |page|            page.alert(" should be a number") end

I also tried using

if !@project.project_number.integer? render :update do |page|            page.alert(" should be a number") end

But it didn't worked. Is there a way to do this??

Try

if not @project.project_number =~ /^[0-9]+$/    ... end

2

Naga harish Kanegolla wrote:

Still its not working, Its giving an alert for both integers and strings, Anything else??

You may have other "stuff" in that variable. If you do something like:

logger.debug("@project.project_number: !#{@project.project_number}!")

do you see:

!123123124!

or stuff like:

!123123123 !

or other non-numbers between the "!"s?

3

Naga harish Kanegolla wrote:

I am getting only the number which i entered in the form,

What's your code look like right now?

Is @project.project_number coming back as a String or Fixnum or something else? You can output @project.project_number.class to see what class it is.

You could try something like this:

if not @project.project_number.to_s =~ /^[0-9]+$/     ... end

If it's not coming back as a String.

4

Naga harish Kanegolla wrote:

I tried outputting like this puts @project.project_number.class, it gave me the Fixnum so i tried using

if not @project.project_number.to_s =~ /^[0-9]+$/     ... end

now its taking both string and integer both into the db. Is there anything else??

If it's a Fixnum it is an integer and you don't need to do a pattern match to check it. How big can the project_number get? A Fixnum is an integer that can fix in the native machine's word.

What happens when you enter in letters into the form field? Is it then coming back as a String class or is it always getting converted to a Fixnum?

5

Naga harish Kanegolla wrote:

What happens when you enter in letters into the form field? Is it then coming back as a String class or is it always getting converted to a Fixnum?

When i enter in letters it is always getting converted into Fixnum, but i want if it is character or string give an alert and if it is a number accept that, so wat can i do now?? Is there a way to do??

Without knowing all the JavaScript, AJAX and server side code that's involved I couldn't tell you.

Your best bet may be to do the check in JavaScript on the client side and put up an alert at that point before you submit the XMLHttpRequest (the AJAX call) to the server.