Hello all,
I have a yaml file that I parse like this
yaml = YAML.parse(yaml_str)
the ‘yaml_str’ variable holds the serialized version of an Object.
Lets say this object hase 2 attributes, ‘title’ and ‘body’.
How can I access them from the ‘yaml’ variable. Ie I want an imaginary
method ‘lookup’:
yaml.lookup[‘title’] # => returns the title value.
I used to do this with a little hack in 1.8.2, this hack does not work
on 1.8.3, I am looking for a portable way to do this.
thanks in advance for any help,
-g.
On Wed, Nov 16, 2005 at 08:53:08PM +0900, George M. wrote:
method ‘lookup’:
yaml.lookup[‘title’] # => returns the title value.
require ‘yaml’
o = Object.new
o.instance_eval{ @title = “foo”; @body = “bar” }
s = YAML.dump(o) # => “!ruby/object \nbody: bar\ntitle: foo\n”
for instance
def add_lookup(obj)
def obj.lookup(x); instance_variable_get “@#{x}” end
end
o2 = YAML.load(s)
add_lookup(o2)
o2.lookup “title” # => “foo”
o2.lookup “body” # => “bar”
[RUBY_VERSION, RUBY_RELEASE_DATE] # => [“1.8.3”, “2005-09-24”]
Ehm,
I forgot to tell you that the original object does not exist in the
current context.
so, o = YAML.load does not yield an object.
-g.
Anw,
just show that:
obj = YAML.load(str)
obj.ivars
does the trick
thanks,
-g.
George M. ha escrito:
method ‘lookup’:
yaml.lookup[‘title’] # => returns the title value.
Huh? You missed the point.
YAML just serializes your object, so if your object supports a method
called title, loading it back in should too. If your object is a hash,
then you can use a hash syntax. Example:
irb
irb>class A
irb> attr_accessor :x
irb> def initialize
irb> @x = 2
irb> end
irb>end
irb>a = A.new
irb>require ‘yaml’
irb>b = YAML.load( YAML.dump(a) )
irb>b.x
2
Huh? You missed the point.
Probably you missed the point Read the later emails that explain
my question in more detail…
-g.