I'm trying to create a new object where the class of the object is
parameterized. My current solution is to use eval():
def create(class)
@obj = eval("#{class}.new()")
end
Is there a better way of doing this to avoid the hit of eval()?
Thanks,
-John
If class is a a class name (a String):
@obj = Object.const_get(klass).new
Using "class" as a parameter name won't work - the standard is to use
"klass" instead.
Bill
On 4/18/05, John Lam <jlam@iunknown.com> wrote:
I'm trying to create a new object where the class of the object is
parameterized. My current solution is to use eval():def create(class)
@obj = eval("#{class}.new()")
end
Is there a better way of doing this to avoid the hit of eval()?
Thanks,
-John
--
Bill Atkins
@obj = Object.const_get(klass).new
does this work if klass == My::Namespace::Klass ?
-g.
George Moschovitis wrote:
> @obj = Object.const_get(klass).new
does this work if klass == My::Namespace::Klass ?
Assuming you mean the string value
klass = "My::Namespace::Klass"
The answer is No. One has to do:
klass = "Klass"
@obj = My::Namespace.const_get(klass).new
The namespace issue is problematic. One alternative is in Ruby Facets:
require 'facet/object/constant'
klass == "My::Namespace::Klass"
@obj = constant(klass).new
T.
The answer is No. One has to do:
klass = "Klass"
@obj = My::Namespace.const_get(klass).new
I was expecting the negative answer 
One alternative is in Ruby Facets
Interesting, I 'll see how that works...
-g.
Or the ever popular
klass.split('::').inject(Object) {|parent, name| parent.const_get(name)}
On 4/20/05, Trans <transfire@gmail.com> wrote:
Assuming you mean the string value
klass = "My::Namespace::Klass"
The answer is No. One has to do...