Rails - Apr 2007 - How to get around observe_field 'template missing' error?

When my params for my observe_field are empty or 0 I get the ''template
missing'' error. I''m trying to emulate the ''user name
is valid/not
valid'' feature that many apps have when signing up. As long as the
params is greater than zero everything is fine.

def already_taken
    if params[:user].strip.length > 0
      user = User.find_by_name(params[:user])
      if user
        render :update do |page|
          page[:already_taken].replace_html "Already taken!"
          page[:already_taken].set_style :color => ''red''
        end
      elsif user == nil
        render :update do |page|
          page[:already_taken].replace_html "Available!"
          page[:already_taken].set_style :color => ''green''
        end
      end
    end
  end

There must be an easier way to do this because it is such a common
feature. Thanks for any help!


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On 09 Apr 2007, at 21:17, jko170 wrote:
> When my params for my observe_field are empty or 0 I get the
''template
> missing'' error. I''m trying to emulate the ''user
name is valid/not
> valid'' feature that many apps have when signing up. As long as the
> params is greater than zero everything is fine.
>
> def already_taken
>     if params[:user].strip.length > 0
>       user = User.find_by_name(params[:user])
>       if user
>         render :update do |page|
>           page[:already_taken].replace_html "Already taken!"
>           page[:already_taken].set_style :color =>
''red''
>         end
>       elsif user == nil
>         render :update do |page|
>           page[:already_taken].replace_html "Available!"
>           page[:already_taken].set_style :color =>
''green''
>         end
>       end
>     end
>   end
>
> There must be an easier way to do this because it is such a common
> feature. Thanks for any help!
Well, you would be better off using javascript itself instead of the  
rails helper and check for the value being empty clientside and only  
query the server if a certain number of characters is entered, but if  
you want to stick with the rails helpers, you should add:

def already_taken
     if params[:user].strip.length > 0
       # do your thing
     else
         render :nothing => true
     end
  end



Best regards

Peter De Berdt


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Thanks a lot Peter!

I''m sure there''s a better way to do my entire project, but I
guess
this is fine for now (plenty of time to learn more and refactor after
project is up).


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I would recommend adding something like :condition => ''value.length
>
0'' to your observe form.

Also you can replace .strip.length > 0 with .blank?


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