I'm learning to use activerecord (not rails).

Two gems are necessary for this: the activerecord gem and the mysql
adpater (I'm using MySQL). I installed both gems (I think successfully).

When I inspect the directory where all my local gems are installed, I
get this:

~/.rvm/gems/ruby-1.9.2-p290/gems marcc$ ls
total 0
drwxr-xr-x  28 marcc  staff   952B Aug 15 19:47 .
drwxr-xr-x   7 marcc  staff   238B Jul 25 11:58 ..
drwxr-xr-x   8 marcc  staff   272B Jul 25 12:07 abstract-1.0.0
drwxr-xr-x   6 marcc  staff   204B Jul 25 12:07 actionmailer-3.0.9
drwxr-xr-x   6 marcc  staff   204B Jul 25 12:07 actionpack-3.0.9
drwxr-xr-x   6 marcc  staff   204B Jul 25 12:07 activemodel-3.0.9
drwxr-xr-x   6 marcc  staff   204B Jul 25 12:07 activerecord-3.0.9
drwxr-xr-x   6 marcc  staff   204B Jul 25 12:07 activeresource-3.0.9
drwxr-xr-x   5 marcc  staff   170B Jul 25 12:07 activesupport-3.0.9
drwxr-xr-x  12 marcc  staff   408B Jul 25 12:07 arel-2.0.10
drwxr-xr-x   9 marcc  staff   306B Jul 25 12:07 builder-2.1.2
drwxr-xr-x  14 marcc  staff   476B Jul 25 12:08 bundler-1.0.15
drwxr-xr-x  14 marcc  staff   476B Jul 25 12:07 erubis-2.6.6
drwxr-xr-x   8 marcc  staff   272B Jul 25 12:07 i18n-0.5.0
drwxr-xr-x   7 marcc  staff   238B Jul 25 12:07 mail-2.2.19
drwxr-xr-x  12 marcc  staff   408B Jul 25 12:07 mime-types-1.16
drwxr-xr-x  13 marcc  staff   442B Aug 15 19:47 mysql-2.8.1
drwxr-xr-x   9 marcc  staff   306B Jul 25 12:07 polyglot-0.3.1
drwxr-xr-x  13 marcc  staff   442B Jul 25 12:07 rack-1.2.3
drwxr-xr-x   5 marcc  staff   170B Jul 25 12:07 rack-mount-0.6.14
drwxr-xr-x  14 marcc  staff   476B Jul 25 12:07 rack-test-0.5.7
drwxr-xr-x   3 marcc  staff   102B Jul 25 12:08 rails-3.0.9
drwxr-xr-x   6 marcc  staff   204B Jul 25 12:08 railties-3.0.9
drwxr-xr-x  12 marcc  staff   408B Jul 25 11:58 rake-0.8.7
drwxr-xr-x  14 marcc  staff   476B Jul 25 12:08 rdoc-3.8
drwxr-xr-x   9 marcc  staff   306B Jul 25 12:07 thor-0.14.6
drwxr-xr-x  11 marcc  staff   374B Jul 25 12:07 treetop-1.4.9
drwxr-xr-x   8 marcc  staff   272B Jul 25 12:07 tzinfo-0.3.29

When I run the gem list command, I get this:

~ marcc$ gem list

*** LOCAL GEMS ***

abstract (1.0.0)
actionmailer (3.0.9)
actionpack (3.0.9)
activemodel (3.0.9)
activerecord (3.0.9)
activeresource (3.0.9)
activesupport (3.0.9)
arel (2.0.10)
builder (2.1.2)
bundler (1.0.15)
erubis (2.6.6)
i18n (0.5.0)
mail (2.2.19)
mime-types (1.16)
polyglot (0.3.1)
rack (1.2.3)
rack-mount (0.6.14)
rack-test (0.5.7)
rails (3.0.9)
railties (3.0.9)
rake (0.8.7)
rdoc (3.8)
thor (0.14.6)
treetop (1.4.9)
tzinfo (0.3.29)

As you can see, the mysql-2.8.1 gem directory is there but the mysql gem
is not listed when I do gem list.

Why is that?

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