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Ruby Gems

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Gem Installation

3:14 with Jason Seifer

Once you know what gem you want to use, you need to install it. We'll do that using the gem command.

Command Reference

Install a gem:

gem install [gem name]

Install a gem from a downloaded package:

gem install [package name.gem]

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    Once you know what gem you want to use, you need to install it. 0:00
    We'll do that using the gem command. 0:04
    Let's take a look at how that works now using Workspaces. 0:07
    So let's go ahead and install a gem. 0:12
    First, I'm going to search for it on RubyGems.org. 0:14
    And, for this example, I'm going to install the money gem. 0:18
    Now, in order to install it, we only need to know the name of the gem, in this case, 0:22
    it's money. 0:28
    So, I've loaded up a workspace here and I'm right in the console. 0:31
    In order to install a gem, all we need to do is type the word gem. 0:35
    And then the word install and the name of the gem, which in this case is money. 0:41
    Once we do that, Ruby and RubyGems will go out, 0:49
    find the gem, download it, and then install it. 0:53
    And we can see that two gems were successfully installed, money and i18n. 1:00
    If we go back to the page on RubyGems.org, 1:09
    we can see that the runtime dependencies specify i18n. 1:13
    And since that's specified, Ruby will download and install that gem as well. 1:19
    Now, if for some reason, you find a gem that isn't on RubyGems and 1:26
    want to install it that way, you can also download the gem. 1:31
    On the right side, there'll be a button to download it. 1:36
    So I've clicked the download button, and 1:40
    you can see that it appears at the bottom of our web browser. 1:42
    So now I'm gonna clear my screen and, if we press the File menu, and 1:48
    Upload File, then select the file that we downloaded and 1:53
    press open, you'll see on the bottom left it says it's uploading. 1:57
    And then it will appear on the left side of the screen here in the file list. 2:02
    From there, we can type the same command, gem, install, 2:07
    and the name of the gem, which will point to this particular gem on the file system. 2:14
    Now, I started typing the name of the gem and then pressed Tab so 2:20
    that the workspace would complete the name for me. 2:24
    Then, press Enter. 2:28
    Now, you'll notice that this time it said it successfully installed 2:31
    the version of the gem that we had in the console. 2:35
    But, it did not install the I18N gem. 2:38
    The reason for 2:41
    that is that is was already installed the last time we installed the gem. 2:43
    Now if I clear my screen here and press gem, and 2:49
    list, it will show me all of the gems that I have installed. 2:52
    Money, which we just installed, and i18n, which came with money. 2:57
    The rest of the gems that you see are all part of the default RubyGems installation. 3:03
    Try installing Gems on your own now using Workspaces. 3:10

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