Seven years ago in 2012 I spoke at RubyConf China 2012. It was a technical talk on how to become a better developer, if you're interested…
So we want to dynamically instantiate an object (i.e. convert a string to a class constant).
Instead of doing this:
@dynamic_var = "User" eval(@dynamic_var)
You can do this:
@dynamic_var = "User" @dynamic_var.constantize
See more about the
constantize method in Rails’s API.