Ruby on Rails latest stable (v4.1.8) - 1 note - Class: ActiveSupport::Dependencies::Loadable
require_dependency(file_name, message = "No such file to load -- %s") public

Interprets a file using mechanism and marks its defined constants as autoloaded. file_name can be either a string or respond to to_path.

Use this method in code that absolutely needs a certain constant to be defined at that point. A typical use case is to make constant name resolution deterministic for constants with the same relative name in different namespaces whose evaluation would depend on load order otherwise.

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July 4, 2010
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Common use

I typically use require_dependency when developing a class or module that resides in my rails app, perhaps in the lib/ dir. A normal require statement does not reload my changes, so I use require_dependency in files that reference my newly developed class or module.