I am trying to include the ruby-mysql gem in my ruby script. I have installed the gem using bundler but when I run bundle exec ./mysql_connector, I receive the error ./mysql_connector:4:in ``require': cannot load such file -- ruby-mysql (LoadError). Can you please help me troubleshoot what the problem is?
What I did
Installed rails in my home directory.
I do not have root access to the server so I have installed rails in my local directory by following the instructions here:
http://www.r-bloggers.com/installing-ruby-on-linux-as-a-user-other-than-root/
Created a directory for my application.
My application resides in my home directory in a folder called connector. It has a Gemfile that looks like this:
source 'https://rubygems.org'
gem 'ruby-mysql'
Call bundle install.
Using ruby-mysql 2.9.14
Using bundler 1.11.2
Bundle complete! 1 Gemfile dependency, 2 gems now installed.
Bundled gems are installed into ./vendor/bundle.
Add dependencies to my script. My script is in connector/mysql_connector and it reads:
#!/home/dcox/bin/ruby
require 'rubygems'
require 'bundler/setup'
require 'ruby-mysql'
Make script executable. I saw that you need to run bundle exec using an executable file, so I followed the instructions here to make my script executable: http://commandercoriander.net/blog/2013/02/16/making-a-ruby-script-executable/
Run the script. I execute using bundle exec mysql_connector and see:
/home/dcox/bin/mysql_connector:4:in `require': cannot load such file -- ruby-mysql (LoadError)
from /home/dcox/bin/mysql_connector:4:in `<main>'
Is it the $LOAD_PATH? After searching around for answers, I discovered a lot of SO answers as well as a blog post (https://codedecoder.wordpress.com/2013/09/23/require-and-load-in-ruby-loaderror-cannot-load-such-file/) that seem to suggest the problem is that the gem is not installed in a directory on the $LOAD_PATH. Here is what I see when I run $LOAD_PATH from IRB:
irb(main):002:0> $LOAD_PATH
=> ["/home/dcox/lib/ruby/site_ruby/2.1.0",
"/home/dcox/lib/ruby/site_ruby/2.1.0/x86_64-linux",
"/home/dcox/lib/ruby/site_ruby", "/home/dcox/lib/ruby/vendor_ruby/2.1.0",
"/home/dcox/lib/ruby/vendor_ruby/2.1.0/x86_64-linux",
"/home/dcox/lib/ruby/vendor_ruby", "/home/dcox/lib/ruby/2.1.0",
"/home/dcox/lib/ruby/2.1.0/x86_64-linux"]
Next I checked to see the location of ruby-mysql:
dcox#analytics1:~/connector$ bundle show ruby-mysql
/data/home/dcox/connector/vendor/bundle/ruby/2.1.0/gems/ruby-mysql-2.9.14
Obviously my connector/vendor/bundle path is not on the $LOAD_PATH. I could add it, but I have a feeling I am missing something simple here because bundler is supposed to work as long as you follow the instructions, right?
Any advice or help is very much appreciated! Thanks!!
If you just want to require this specific gem, require 'mysql' should work (e.g., https://github.com/tmtm/ruby-mysql/blob/master/test/test_mysql.rb#L10).
Your file should call Bundler.setup http://bundler.io/bundler_setup.html
Better yet, if you instead call Bundler.require(:default) it will setup and require all the gems in your Gemfile for you.
Related
I'm deploying my rails project to production server. There is only 1.9.3 version of ruby (I developed on 2.1.2) so there is few compatibility problems in gems versions. More over, I downloaded one of gems to vendor/gem_name and made necessary fixes in its sources, so I need to use exactly my version of that gem and, as you understand, It's not possible to update it.
in Gemfile
require 'gem_name', :path => 'vendor/gem_name'
So after cloning project to server I run
bundle install --path vendor/bundle
and it created bundle directory in vendor folder with gems versions, needed to me, inside it.
After that I tried to run fetching script to fill db with some data by command
ruby *_fetch.rb
inside *_fetch.rb:
require 'gem_name'
And it fails with error
You have already activated gem_name older_version, but your Gemfile requires
gem_name newest_version. Using bundle exec may solve this. (Gem::LoadError)
from /usr/local/rvm/gems/ruby-1.9.3-p374/gems/bundler-1.3.5/lib/bundler/runtime.rb:19:in `setup'
So how could I specify script to require my edited local gem?
Run it with bundle exec That's exactly what bundle exec is for.
I wonder whether Gemfile is a rails-tied file or not. If I have something as:
require 'json'
in my ruby file, the user tries to run it, and he doesn't have that gem, what will happen? How do I make sure that someone's computer knows what gems to install before running my script? I know bundle install exists in Rails, but what about outside Rails?
Gemfile isn't a Rails-tied file. It's the file that you can use any Ruby-based project with bundler gem installed. Once you've run bundle install command, another file Gemfile.lock is generated or updated if exists. By the way, gems you'll use are linked with locations in your computer/server you're developing.
I've forked the redis depository on github to https://github.com/lmirosevic/redis-rb
I added it to my Gemfile:
gem 'redis', :github => 'lmirosevic/redis-rb'
And I require the gem inside my Sinatra app:
require 'redis'
However it fails with the following error:
/app/vendor/ruby-2.0.0/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require': cannot load such file -- redis (LoadError)
Any suggestions on what could be wrong? It seems like it should work!
EDIT
I should note that the bundler phase is fine. The problem seems to be in the require step.
Bundler gives me this output:
Using redis (3.0.4) from git://github.com/lmirosevic/redis-rb (at master)
I should also say that my directory structure is something like this. Not sure if this makes a difference.
/
.env
Gemfile
Gemfile.lock
Procfile
/lib
my_sinatra_app.rb
/config
...
You must have
require 'bundler/setup'
in your app or else you're not really using bundler: this is what ensures that the gem versions loaded are the ones in your gemfile and sets up load paths for anything not installed globally.
Calling Bunder.setup allows you to control what groups are used, but if just using the default group is fine then you don't need to do this.
If you aren't setting up bundler then your gemfile is used to install the required versions of the gems but then bundler is no longer used - your app will used whatever gems are installed, whether the versions match or not and you won't be able to use gems that aren't installed in the default gem load paths.
I just installed Ruby 1.9.3 on Windows 7 and I also installed rubygems. I'm trying to work with rspec so I ran:
gem install rspec
It seemed to work well and everything installed. SO I went on to try the example on this page. But anytime I run the rspec command I get this error message:
"Could not locate Gemfile".
According to the example, I should get: "./bowling_spec.rb:4:
uninitialized constant Bowling"
I've googled it and it was suggested I try bundle exec rspec but it still yielded the same results.
I have also tried the suggestion on this page but it yields the same results. What am I doing wrong? Thanks
Create the Gemfile with this content. Gemfile can have no extension or .gem extension
source 'https://rubygems.org'
gem 'rspec'
so you have
app/
Gemfile or Gemfile.gem
spec/
bowling_spec.rb
Also you might need to execute this commands after
gem install bundler
and then, in the app directory
bundle install
gem install rspec in the same directory as your app and
change require statement to require './bowling.rb'
I'm new to Ruby. I have a .bundle file. I put it in the source folder and did
require('my.bundle')
But when I call the methods in the bundle, the definition is not found. Do I have to install them or include them in some other way to access them?
I am on Ruby version 1.8.7 (latest version on Mac).
I highly recommend using RVM to manage your Ruby installation, including your gems, so if you don't already have that, get it and follow the instructions for installing it. Make sure you do the part about modifying your bash startup script or you'll see weird behavior, like the wrong Ruby being called. Also, use the steps in "RVM and RubyGems" to install your gems or you can run into weird behavior with gems being installed under the wrong or an unexpected Ruby.
Second, use the gem command to install gems:
gem install gem_to_install
replacing "gem_to_install" with the name of the gem you want, and it will be installed into the appropriate gem folder for your Ruby.
If you are on Ruby 1.92, and trying to require a gem to use as a module in your code, use:
require 'gemname'
if it is installed via the gem command. And, if it is a module you wrote or have in your program's directory or below it, use:
require_relative 'path/to/gem/gemname'
If you are on a Ruby < 1.9 you'll also need to add require 'rubygems' above your other require lines, then use require './path/to/gem/gemname'.
Thanks, but my .bundle is not in gems. How do I install/require a .bundle file I already have?
If you wrote it look into rubygems/gemcutter or bundler for info on bundling and managing gems.
You can install a gem without using the app by going into the directory containing the gem and running setup.rb. See http://i.loveruby.net/en/projects/setup/doc/usage.html for a decent writeup or the official docs at: http://docs.rubygems.org/read/chapter/3