Why ruby gems

These paths vary from system to system, and they also depend on how you installed Ruby rvm is different from Homebrew, which is different from rbenv, and so on. The comment is pretty clear:. That gives you this error:. You can even use the original version of require , the one that was overwritten by RubyGems:. RubyGems might seem complicated. But knowing RubyGems even at this surface level will help out a lot. You can understand where your gems live, so you can make sure that RubyGems knows about them.

And once you know how gems are loaded, you can dig into some crazy-looking loading problems. Have you slogged through the same guide three times and still don't know how to build a real app? In this free 7-day Rails course, you'll learn specific steps to start your own Rails apps — without giving up, and without being overwhelmed. You should get an email from me in a few minutes with your free sample chapter.

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We're working on something new! Hook Relay gives you Stripe-quality webhooks in minutes. Sign up for free today! Check out Hook Relay. How do Ruby Gems work? Here we'll take a closer look at Ryan Bates' CanCan authorization gem and answer the following questions which, if asked more broadly, could apply to any gem : Where does the code for CanCan get stored?

Where is the can?