Rails - Jun 2006 - unique login

Hello,

I''ve created my user model which validates against the database for a
proper user/pass combination.  I''ve set validation options to ensure
that
both a user and password are entered.

I would like to check via an ajax call whether or not the username is
taken.  I haven''t been able to find a tutorial covering this topic.  Do
any of you know of one?

Thanks,
David

observe_field is your friend here.  Alternatively try a search for "live
search" or something similar.

An example (Untested)

<%= text_field "user", "name" %>
<div id="user_name_result"
style="display:none"></div>

<%= observe_field "user_name", :url => { :controller =>
''user'', :action =>
''check_user_name'' },  :update =>
''user_name_result'', :on =>  ''changed'',
:complete => "new Effect.Show(
''user_name_result'')"  %>

Additionally you can use the link_to_remote options.  eg :loading, :complete
etc

Then in your controller you have a method

def check_user_name
  @user = User.find_by_name( params[:user][:name] ) || User.new
  if @user.new_record?
     render :inline => "Div contents to indicate that the name is
available.  This will go in the div" and return
  else
     render :inline => "Div contents to indicate that it''s
taken"
  end
end


On 6/9/06, David <lists@codecharter.com> wrote:
>
> Hello,
>
> I''ve created my user model which validates against the database
for a
> proper user/pass combination.  I''ve set validation options to
ensure that
> both a user and password are entered.
>
> I would like to check via an ajax call whether or not the username is
> taken.  I haven''t been able to find a tutorial covering this
topic.  Do
> any of you know of one?
>
> Thanks,
> David
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
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David <lists@...> writes:
[..]
> I''ve created my user model which validates against the database
for a
> proper user/pass combination.  I''ve set validation options to
ensure that
> both a user and password are entered.
> 
> I would like to check via an ajax call whether or not the username is
> taken.  I haven''t been able to find a tutorial covering this
topic.  Do
> any of you know of one?
[..]

What about something like the following (not tested):

In your login view:

<%= text_field ''user'', ''username'',
:onChange => remote_function(:update =>
''availability_confirmation'', :url => {:controller =>
''users'', :action =>
''check_for_availability''}, :with =>
"''username=''+this.value") %>

<div id="availability_confirmation"> </div>

And in your controller (ie. ''users_controller.rb''):

  def check_for_availability
    if User.find_by_username(params[:username]).empty?
      render :inline => ''<span> Oh yeah! Good choice
dude!</span>''
    else
      return :inline => ''<span> Please, choose another
username </span>''
    end
  end

Cheers,
Marco