Appendix A. ActiveSupport API Reference

ActiveSupport is a Rails library containing utility classes and extensions to Ruby’s built-in libraries. It usually doesn’t get much attention on its own—you might even call its modules the supporting cast members of the Rails ensemble.

However, ActiveSupport’s low profile doesn’t diminish its importance in day-to-day Rails programming. To ensure that this book is 100 percent useful as a programming companion, here is a complete, enhanced version of the Rails ActiveSupport API reference, supplemented where appropriate with real-life example usages and commentary.

Direct extensions of Ruby classes and modules are listed under headings according to class or module name. Extensions made via mixin module appear ...

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