I installed data_mapper for a Sinatra project. Curious, why is it when I do gem install brew
, I can $ which brew
and get the path of its location and can't for data_mapper? This works for some gems and doesn't for others.
How do I verify a gem is installed properly? Would checking the version assure the gem is downloaded correctly?
Since your goal is to verify a gem is installed with the correct version, use gem list . You can limit to the specific gem by using gem list data_mapper . To verify that it's installed and working, you'll have to try to require the gem and then use it in your code.
To check if a specific version is installed, just add --version , e.g.: gem list -i compass --version 0.12.
When you use the --user-install option, RubyGems will install the gems to a directory inside your home directory, something like ~/. gem/ruby/1.9. 1 . The commands provided by the gems you installed will end up in ~/.
The install command installs local or remote gem into a gem repository. For gems with executables ruby installs a wrapper file into the executable directory by default.
General solution
To get the full list of gems that are installed:
gem list
To test for a particular gem, you can use -i
with a regex:
gem list -i "^gem_name$"
(Credit to Timo in the comments for this technique.)
Particular solution for OP
If you can't find data_mapper, it may be that the gem name is different from what you expect.
Also, if you're just doing which brew
to find brew, you aren't finding the gem called brew, you're finding the location of the brew executable. Try gem which brew
instead.
EDIT:
If you're looking for data_mapper by doing which data_mapper
, you probably won't find it. which
is a unix program for finding unix executables, and data_mapper probably doesn't have one.
Since your goal is to verify a gem is installed with the correct version, use gem list
. You can limit to the specific gem by using gem list data_mapper
.
To verify that it's installed and working, you'll have to try to require
the gem and then use it in your code.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With