I have a class being used in a unit test:
TC_Foo
I match it against a regexp:
/TC_(.*)/.match(self.class.name)
I end up with a string ($1 == “Foo”) which I want to be an instance of Class
(== Foo). How can I convert a String to a Class? Will I have to use
ObjectSpace to find a Class whose Class#name == “Foo”?
Tim Bates
Hi,
At Sat, 21 Dec 2002 18:00:31 +0900, Tim Bates wrote:
I have a class being used in a unit test:
TC_Foo
I match it against a regexp:
/TC_(.*)/.match(self.class.name)
I end up with a string ($1 == “Foo”) which I want to be an instance of Class
(== Foo). How can I convert a String to a Class? Will I have to use
ObjectSpace to find a Class whose Class#name == “Foo”?
eval($1)
or
Object.const_get($1)
–
Nobu Nakada
I end up with a string ($1 == “Foo”) which I want to be an instance of Class
(== Foo). How can I convert a String to a Class? Will I have to use
ObjectSpace to find a Class whose Class#name == “Foo”?Tim Bates
Are you ready, Tim? This could hardly be easier. Are you sitting down?
klass = eval $1
Cheers,
Gavin
From: “Tim Bates” tim@bates.id.au
There’s a page on the Wiki with a number of solutions:
http://www.rubygarden.org/ruby?FindClassesByName
Cheers
Dave
On Sat, 2002-12-21 at 03:00, Tim Bates wrote:
I have a class being used in a unit test:
TC_Foo
I match it against a regexp:
/TC_(.*)/.match(self.class.name)
I end up with a string ($1 == “Foo”) which I want to be an instance of Class
(== Foo). How can I convert a String to a Class? Will I have to use
ObjectSpace to find a Class whose Class#name == “Foo”?
I have a class being used in a unit test:
TC_Foo
I match it against a regexp:
/TC_(.*)/.match(self.class.name)
I end up with a string ($1 == “Foo”) which I want to be an instance of Class
(== Foo). How can I convert a String to a Class? Will I have to use
ObjectSpace to find a Class whose Class#name == “Foo”?
Hey,
I wrote a String#to_class implementation using const_get for my friend a
few months back. Check out
http://www.pablotron.org/download/string_to_class.rb (there’s test code
and examples included in the file).
Tim Bates
tim@bates.id.au
–
Paul Duncan pabs@pablotron.org pabs in #gah (OPN IRC)
http://www.pablotron.org/ OpenPGP Key ID: 0x82C29562
D’oh!
(Respond same to Gavin’s email.)
Although, in the end I used Object.const_get because it makes my intentions a
bit clearer, although the error messages for a nonexistant class are almost
identical. I guess I didn’t think of it because in that sort of situation I
consider eval a bit of a hack.
Tim Bates
I have a class being used in a unit test:
TC_Foo
I match it against a regexp:
/TC_(.*)/.match(self.class.name)
I end up with a string ($1 == “Foo”) which I want to be an instance of Class
(== Foo). How can I convert a String to a Class? Will I have to use
ObjectSpace to find a Class whose Class#name == “Foo”?There’s a page on the Wiki with a number of solutions:
I don’t know if the original poster needs it, but The examples there
don’t work with anonymous classes or non-colon delimited class names.
The bit I wrote does.
On Sat, 2002-12-21 at 03:00, Tim Bates wrote:
Cheers
Dave
–
Paul Duncan pabs@pablotron.org pabs in #gah (OPN IRC)
http://www.pablotron.org/ OpenPGP Key ID: 0x82C29562
eval($1)
- Tim smacks head with palm.
D’oh!
(Respond same to Gavin’s email.)
Although, in the end I used Object.const_get because it makes my intentions a
bit clearer, although the error messages for a nonexistant class are almost
identical. I guess I didn’t think of it because in that sort of situation I
consider eval a bit of a hack.
I agree. I’ve never needed to do this before, and wouldn’t have thought of
Object.const_get. In fact, I only half get that…
Tim Bates
tim@bates.id.au
Gavin