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[Rails Tip] "String".constantize

February 26, 2010|1 Min Read|Comments|

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.

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