def update
    @user = User.find(params[:user])
    if @user.update_attributes(@user)
      flash[:success] = "Profile updated"
      redirect_to @user
    else
      render 'edit'
    end
  end

ArgumentError in UsersController#update

Unknown key: fullname

def update
    if @user.update_attributes(params[:user])
      flash[:success] = "Profile updated"
      redirect_to @user
    else
      render 'edit'
    end
  end

NoMethodError in UsersController#update

undefined method `update_attributes' for nil:NilClass

%h3 Update profile

= form_for(@user) do |f|

	= f.text_field :fullname, placeholder: "Your name"

	= f.submit "Update"

voidandnull@LocalMain:~$ gem install pg
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
	ERROR: Failed to build gem native extension.

        /home/voidandnull/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
checking for pg_config... yes
Using config values from /usr/bin/pg_config
checking for libpq-fe.h... yes
checking for libpq/libpq-fs.h... yes
checking for pg_config_manual.h... yes
checking for PQconnectdb() in -lpq... no
checking for PQconnectdb() in -llibpq... no
checking for PQconnectdb() in -lms/libpq... no
Can't find the PostgreSQL client library (libpq)
*** 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
	--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=/home/voidandnull/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
	--with-pg
	--without-pg
	--with-pg-dir
	--without-pg-dir
	--with-pg-include
	--without-pg-include=${pg-dir}/include
	--with-pg-lib
	--without-pg-lib=${pg-dir}/lib
	--with-pg-config
	--without-pg-config
	--with-pg_config
	--without-pg_config
	--with-pqlib
	--without-pqlib
	--with-libpqlib
	--without-libpqlib
	--with-ms/libpqlib
	--without-ms/libpqlib


Gem files will remain installed in /home/voidandnull/.rvm/gems/ruby-1.9.3-p194/gems/pg-0.14.0 for inspection.
Results logged to /home/voidandnull/.rvm/gems/ruby-1.9.3-p194/gems/pg-0.14.0/ext/gem_make.out