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):
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):
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
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.
@user = User.find(session[:user_id]), thanks a lot
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
