2 ways to convert strings to classes in Ruby _ruby topic

Recently, there is a need to use a string as a class, for example:

There is a string "Chinamag" that invokes the method under the class Chinamag according to this string.

Solution:

1.rails You can use the Constantize method.

Copy Code code as follows:

Pry (Main) > ' Chinamag '. constantize
=> Chinamag
Pry (Main) > "Test::unit". Constantize
=> Test::unit

2.ruby can use Object.const_get ("String").

Copy Code code as follows:

Pry (Main) > Object::const_get (' Chinamag ')
=> Chinamag

Pry (Main) > Module Foo
Pry (Main) * Class Bar
Pry (Main) * End
Pry (Main) * End
=> Nil
Pry (Main) > ' Foo::bar '. Split (':: '). Inject (Object) {|o,c| o.const_get C}
=> Foo::bar