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为什么我们不能访问救援内部的局部变量?

ruby

9

krunal shah · 技术社区 · 14 年前

局部变量

begin
  transaction  #Code inside transaction 
    object = Class.new attributes
    raise unless object.save!
  end 
rescue
  puts object.error.full_messages # Why can't we use local varible inside rescue ?
end

实例变量

begin
  transaction  #Code inside transaction 
    @object = Class.new attributes
    raise unless @object.save!
  end 
rescue
  puts @object.error.full_messages # This is working fine.
end

1 回复 | 直到 14 年前

1

28

sepp2k 14 年前

begin rescue

define transaction() yield end
transaction do
  x = 42
end
puts x # This will cause an error because `x` is not defined here.

x = nil
transaction do
  x = 42
end
puts x # Will print 42

begin
  object = nil
  transaction do  #Code inside transaction 
    object = Class.new attributes
    raise unless object.save!
  end 
rescue
  puts object.error.full_messages # Why can't we use local varible inside rescue ?
end