how to do: var1 = var2.new(.....) (var2 contains classname)

[Luca Scaljery]

Hi All

I have a situation in which I have the name of the class in a variable
So normally I would do
song = Song.new("Bicylops", "Fleck", 260)

But I need to do something like
var2 = "Song"
var1 = var2.new("Bicylops", "Fleck", 260)

This doesn't work!
Any suggestions how to do this ?

Thnx
LuCa

 

[Lyle Johnson]

I have a situation in which I have the name of the class in a variable
So normally I would do
song = Song.new("Bicylops", "Fleck", 260)

But I need to do something like
var2 = "Song"
var1 = var2.new("Bicylops", "Fleck", 260)

This doesn't work!
Any suggestions how to do this ?

var1 = Object.get_const(var2).new("Bicyclops", "Fleck", 260)

 

[Tim Pease]

Hi All

I have a situation in which I have the name of the class in a variable
So normally I would do
song = Song.new("Bicylops", "Fleck", 260)

But I need to do something like
var2 = "Song"
var1 = var2.new("Bicylops", "Fleck", 260)

This doesn't work!
Any suggestions how to do this ?

You need to convert your string "Song" into a Class object.

var2 = "Song"
var1 = Object.const_get(var2).new("Bicyclops", "Fleck", 260)

All class and module objects are stored as constants in Object. It
gets a little tricky if you have a class withing a module --
"Music::Song". Then you'll have to do something like this:

current = Object
var2 = "Music::Song"
var2.split("::").each do |str|
current = current.const_get(str)
end
var1 = current.new( ... )


Hope this helps

TwP

 

[Lyle Johnson]

var1 = Object.get_const(var2).new("Bicyclops", "Fleck", 260)

Whoops, that should be "const_get(var2)", not "get_const(var2)".

 

[Luca Scaljery]

Hi

Thanks for the solution!
It works!!

LuCa

 

[Patrick Spence]

var1 = Object.get_const(var2).new("Bicyclops", "Fleck", 260)

should be #const_get()