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:
4:


    5:
  • Screen name: <%= @user.screen_name %>

  • 6:
  • Email: <%= @user.email %>

  • 7:
  • Password: **********

  • 8:

Thanks a lot to everybody!

On Sat, Aug 14, 2010 at 6:19 AM, Manu L. [email protected]
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:

  • Screen name: <%= @user.screen_name %>
  • It means you haven’t set @user to anything (or inadvertently set it to
    nil); look at your controller code.


    Hassan S. ------------------------ [email protected]
    twitter: @hassan

    Hassan S. wrote:

    On Sat, Aug 14, 2010 at 6:19 AM, Manu L. [email protected]lid
    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: �

  • Screen name: <%= @user.screen_name %>
  • It means you haven’t set @user to anything (or inadvertently set it to
    nil); look at your controller code.


    Hassan S. ------------------------ [email protected]
    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

    On Sat, Aug 14, 2010 at 6:46 AM, Manu L. [email protected]
    wrote:

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

    Well, this is my code:

    NoMethodError in User#index

    Where is the method for index ?


    Hassan S. ------------------------ [email protected]
    twitter: @hassan

    Hassan S. wrote:

    On Sat, Aug 14, 2010 at 6:46 AM, Manu L. [email protected]
    wrote:

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

    Well, this is my code:

    NoMethodError in User#index

    Where is the method for index ?


    Hassan S. ------------------------ [email protected]
    twitter: @hassan

    Only this:

    def index
    @title = “RailsSpace User Hub”
    end

    On Sat, Aug 14, 2010 at 6:56 AM, Manu L. [email protected]
    wrote:

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

    def index
    @title = “RailsSpace User Hub”
    end

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


    Hassan S. ------------------------ [email protected]
    twitter: @hassan

    Hassan S. wrote:

    On Sat, Aug 14, 2010 at 6:56 AM, Manu L. [email protected]
    wrote:

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

    def index
    � �@title = “RailsSpace User Hub”
    end

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


    Hassan S. ------------------------ [email protected]
    twitter: @hassan

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

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

    On Sat, Aug 14, 2010 at 7:23 AM, Manu L. [email protected]
    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 S. ------------------------ [email protected]
    twitter: @hassan

    On 14 August 2010 19:06, Manu L. [email protected] 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

    Hassan S. wrote:

    On Sat, Aug 14, 2010 at 7:23 AM, Manu L. [email protected]
    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 S. ------------------------ [email protected]
    twitter: @hassan

    Alright man, the first was easy!
    @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

    Thanks!

    Colin L. wrote:

    On 14 August 2010 19:06, Manu L. [email protected] 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 © 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:intry_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:inblock 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:inopen’
    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:inopen’
    from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:272:in postpone' from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:669:inchecking_for’
    from C:/Ruby191/lib/ruby/1.9.1/mkmf.rb:810:in have_header' from extconf.rb:15:inblock in ’
    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:increate_makefile_with_core’
    from extconf.rb:20:in `’

    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:>

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