Redirecting after logging in

Hey everybody,

I'm trying to make an example of a small networking site, and when I log
in a user, it should redirect and show his profile, but I get the
following error:

NoMethodError in User#index

Showing app/views/user/index.html.erb where line #5 raised:

undefined method `screen_name' for nil:NilClass
Extracted source (around line #5):

2: Your basic information
3: </h2>
4: <ul>
5: <li>Screen name: <%= @user.screen_name %></li>
6: <li>Email: <%= @user.email %></li>
7: <li>Password: ********** </li>
8: </ul>

Thanks a lot to everybody!

It means you haven't set @user to anything (or inadvertently set it to
nil); look at your controller code.

Hassan Schroeder wrote:

I'm trying to make an example of a small networking site, and when I log
in a user, it should redirect and show his profile, but I get the
following error:

undefined method `screen_name' for nil:NilClass
Extracted source (around line #5):

5: � <li>Screen name: <%= @user.screen_name %></li>

It means you haven't set @user to anything (or inadvertently set it to
nil); look at your controller code.

--
Hassan Schroeder ------------------------ hassan.schroeder@gmail.com
twitter: @hassan

Well, this is my code:

def login
    @title = "Log in to RailsSpace"
    if request.get?
      @user = User.new(:remember_me => cookies[:remember_me] || "0")
    elsif params_posted?(:user)
      @user = User.new(params[:user])
      user =
User.find_by_screen_name_and_password(@user.screen_name,@user.password)
      if user
        user.login!(session)
        if @user.remember_me? ? user.remember!(cookies) :
user.forget!(cookies)
          flash[:notice] = "User #{user.screen_name} logged in!"
          redirect_to_forwarding_url
        else
          @user.clear_password!
          flash[:notice] = "Invalid screen name/password combination"
        end
      end
    end
  end

private
def redirect_to_forwarding_url
    if (request_url = session[:protected_page])
      session[:protected_page] = nil
      redirect_to request_url
    else
      redirect_to :action => "index"
    end
  end

Where is the method for `index` ?

Hassan Schroeder wrote:

Uh, OK. See any "@user" there ? :slight_smile:

Hassan Schroeder wrote:

Hehe, ok, I just wrote
@user =
User.find_by_screen_name_and_email(@user.screen_name,@user.email)

That seems a little circular -- you're going to assign @user by using
attributes of @user ?? :slight_smile:

but now, when I click the login button in order to log in my user, I
don't get redirected

I'd suggest checking your log file.

Hassan Schroeder wrote:

If you can't work out what is happening to the flow in your code it
can often be useful to use ruby-debug to break in to your code, where
you can inspect data and step through the code. See the Rails Guide
on debugging.

Colin

Colin Law wrote:

@user = User.find(session[:user_id]), thanks a lot :slight_smile:
The second one, I'm afraid that will need a little more research because
I can't find anything in the development.log

If you can't work out what is happening to the flow in your code it
can often be useful to use ruby-debug to break in to your code, where
you can inspect data and step through the code. See the Rails Guide
on debugging.

Colin

Well, I tried, but I get lots of errors, even with ruby-debug19 -as I am
using Ruby 1.9.1-p249- but I keep getting errors and that prevent me
being able to use it:

Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\>gem install ruby-debug19
Building native extensions. This could take a while...
ERROR: Error installing ruby-debug19:
        ERROR: Failed to build gem native extension.

C:/Ruby191/bin/ruby.exe extconf.rb
checking for vm_core.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=C:/Ruby191/bin/ruby
        --with-ruby-dir
        --without-ruby-dir
        --with-ruby-include
        --without-ruby-include=${ruby-dir}/include
        --with-ruby-lib
        --without-ruby-lib=${ruby-dir}/lib
C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:364:in `try_do': The complier failed
to genera
te an executable file. (RuntimeError)
You have to install development tools first.
        from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:433:in `try_cpp'
        from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:811:in `block in
have_header'
        from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:670:in `block in
checking_for'
        from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:276:in `block (2 levels)
in postp
one'
        from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:250:in `open'
        from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:276:in `block in
postpone'
        from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:250:in `open'
        from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:272:in `postpone'
        from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:669:in `checking_for'
        from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:810:in `have_header'
        from extconf.rb:15:in `block in <main>'
        from
C:/Ruby191/lib/ruby/gems/1.9.1/gems/ruby_core_source-0.1.4/lib/ruby
_core_source.rb:18:in `call'
        from
C:/Ruby191/lib/ruby/gems/1.9.1/gems/ruby_core_source-0.1.4/lib/ruby
_core_source.rb:18:in `create_makefile_with_core'
        from extconf.rb:20:in `<main>'

Gem files will remain installed in
C:/Ruby191/lib/ruby/gems/1.9.1/gems/linecache
19-0.5.11 for inspection.
Results logged to
C:/Ruby191/lib/ruby/gems/1.9.1/gems/linecache19-0.5.11/ext/tra
ce_nums/gem_make.out

C:\>