From: "gergoerdosi (Gergo Erdosi)" <gergo@...>
Date: 2013-11-05T09:51:57+09:00
Subject: [ruby-core:58163] [ruby-trunk - Bug #9081] Unexpected result for	and opreator


Issue #9081 has been updated by gergoerdosi (Gergo Erdosi).


This isn't unexpected behavior. (({and})) and (({or})) are not boolean, but control flow operators. Execution stops when an operation returns (({nil})) or (({false})(({).})) Use (({&&})) or (({||})) for the desired behavior.
----------------------------------------
Bug #9081: Unexpected result for and opreator
https://bugs.ruby-lang.org/issues/9081#change-42748

Author: aminhotob (Mo Amin)
Status: Open
Priority: High
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin11.4.2]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


I use this code to test and confirm this result

  def show
    @profile = .......
    puts "=================="
    puts user_signed_in?
    puts current_user.id
    puts @profile.user.id
    puts user_signed_in? and (current_user.id == @profile.user.id)
    puts true and (1 == 2)
    puts true and false
    puts true && false
    puts "=================="
   .......
  end


this is console output

==================
  User Load (0.6ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 3 ORDER BY `users`.`id` ASC LIMIT 1
true
3
  User Load (0.4ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 11 ORDER BY `users`.`id` ASC LIMIT 1
11
true
true
true
false
==================

the last two lines will clear the problem, I except and, && is the same !


ruby -v  ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin11.4.2]
rails -v  Rails 4.0.0


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