If I were to have this:
class Hew
def initialize(string)
@string = string
end
def other_method
end
end
a = Hew.new("Broown Cew")
=> #<Hew:0x40e8238 @string = "Broown Cew">
b = a.to_s
=> "#<Hew:0x40e8238>"
My question is: Is there anyway to get the class (and its info) from b
(i.e what is now a string)?
I see that changing it to a string loses the @string = "Broown Cew" bit.
--
Posted via http://www.ruby-forum.com/.
If I understand what you mean, then what you really want is the inspect
method
b = a.inspect
=> "#<Hew:0x0000010086c440 @string=\"Broown Cew\">"
On Thu, Oct 14, 2010 at 1:03 PM, Huw Taylor <huw_taylor@hotmail.co.uk>wrote:
If I were to have this:
class Hew
def initialize(string)
@string = string
end
def other_method
end
enda = Hew.new("Broown Cew")
=> #<Hew:0x40e8238 @string = "Broown Cew">b = a.to_s
=> "#<Hew:0x40e8238>"My question is: Is there anyway to get the class (and its info) from b
(i.e what is now a string)?I see that changing it to a string loses the @string = "Broown Cew" bit.
--
Posted via http://www.ruby-forum.com/\.
Huw Taylor wrote in post #950237:
If I were to have this:
class Hew
def initialize(string)
@string = string
end
def other_method
end
enda = Hew.new("Broown Cew")
=> #<Hew:0x40e8238 @string = "Broown Cew">b = a.to_s
=> "#<Hew:0x40e8238>"My question is: Is there anyway to get the class (and its info) from b
(i.e what is now a string)?
Maybe you're looking for ObjectSpace._id2ref
Unfortunately, the hex pointer shown by #inspect doesn't always map
directly to the object's object_id, and I think the algorithm to map it
varies with the version of ruby you're running 
But here in principle is how you recover a reference to the object:
RUBY_DESCRIPTION
=> "ruby 1.8.7 (2010-01-10 patchlevel 249) [x86_64-linux]"
a = Hew.new("Broown Cew")
=> #<Hew:0x7f7b6ea152e8 @string="Broown Cew">
a.object_id.to_s(16)
=> "3fbdb750a974"
(a.object_id << 1).to_s(16)
=> "7f7b6ea152e8"
b = ObjectSpace._id2ref(Integer("0x7f7b6ea152e8") >> 1)
=> #<Hew:0x7f7b6ea152e8 @string="Broown Cew">
a.eql?(b)
=> true
--
Posted via http://www.ruby-forum.com/\.
There are two potential questions hidden in this problem:
Q1) How do I make the string representation of my object more readable?
A1) Define your own #to_s:
class Hew
def initialize(string)
@string = string
end
def to_s
"Hew new #{@string}"
end
end
cew = Hew.new("Broown Cew")
p cew
# => #<Hew:0x1001560c0 @string="Broown Cew">
puts cew
# => Hew new Broown Cew
Q2) How do I get an object back from a string representation?
A2) Don't use to_s to get a string representation, use YAML, JSON, Marshal, or something else equally suited to serialize and deserialize your object into a readable presentation:
require 'yaml'
s = cew.to_yaml
puts s
# =>
# --- !ruby/object:Hew
# string: Broown Cew
p YAML.load(s)
# => #<Hew:0x1004aa848 @string="Broown Cew">
On Oct 14, 2010, at 11:03 , Huw Taylor wrote:
If I were to have this:
class Hew
def initialize(string)
@string = string
end
def other_method
end
enda = Hew.new("Broown Cew")
=> #<Hew:0x40e8238 @string = "Broown Cew">b = a.to_s
=> "#<Hew:0x40e8238>"My question is: Is there anyway to get the class (and its info) from b
(i.e what is now a string)?I see that changing it to a string loses the @string = "Broown Cew" bit.
Or, perhaps, marshal (http://ruby-doc.org/core/classes/Marshal.html\)
Regards,
Ammar
On Thu, Oct 14, 2010 at 9:27 PM, Josh Cheek <josh.cheek@gmail.com> wrote:
On Thu, Oct 14, 2010 at 1:03 PM, Huw Taylor <huw_taylor@hotmail.co.uk>wrote:
If I were to have this:
class Hew
def initialize(string)
@string = string
end
def other_method
end
enda = Hew.new("Broown Cew")
=> #<Hew:0x40e8238 @string = "Broown Cew">b = a.to_s
=> "#<Hew:0x40e8238>"My question is: Is there anyway to get the class (and its info) from b
(i.e what is now a string)?I see that changing it to a string loses the @string = "Broown Cew" bit.
--
Posted via http://www.ruby-forum.com/\.If I understand what you mean, then what you really want is the inspect
method
b = a.inspect
=> "#<Hew:0x0000010086c440 @string=\"Broown Cew\">"
