I am trying to use the prawn gem. I am just trying out the basic hello world example, on an ubuntu machine.
require 'prawn'
Prawn::Document.generate("hello.pdf") do
text "Hello World!"
end
First problem was that I was using ruby 1.9.1, it produced an error and said it needed ruby 2.0, so using RVM I updated to 2.2.1. However everytime I run this, I get this error
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in require': cannot
load such file -- prawn (LoadError) from
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:inrequire' from
prawnpdf.rb:1:in `'
Now I am bit a newbie with Ubuntu and ruby for that matter, but I assume the issue is that it is looking in the wrong place for the prawn gem which I have installed ie it is looking in the old verison of ruby.
When I run $ ruby -v
I get
ruby 2.2.1p85 (2015-02-26 revision 49769) [i686-linux]
what am I doing wrong? any help would be most appreicated.
Follow the given step.
1: rvm list
rvm rubies
ruby-2.0.0-p643 [ x86_64 ]
ruby-2.2.1 [ x86_64 ]
=* ruby-2.2.4 [ x86_64 ]
2: rvm use < ruby-version > # for instances ruby-1.9.3-p125
rvm use 2.2.1
3: gem install prawn
Would work !!!
Each time you switch ruby versions with rvm, you start using a new gemset. Having previously installed prawn doesn't mean it is currently installed, and the error message suggests it's not installed. So:
rvm use 2.2.1
and then
gem install prawn
Then your code should work.
I suggest you create a Gemfile for your project so it becomes easier to maintain the dependencies.
See details: http://bundler.io/
Then cd into your project directory and install the bundle (once or after changes) and run your ruby script:
cd my_project
bundle install
ruby my_thing.rb
If you cannot/don't want to use bundler: you need to reinstall the Gem for every ruby.
Related
This problem probably has an obvious answer to anyone who has used Ruby on linux for a long time, but I can't really get a good answer via Google.
I'm trying to check out the Rails 5 beta, which requires Ruby 2.2.2 or greater. I've installed the RVM (Ruby Version Manager) and set my ruby version to 2.2.3. Running rvm list in the terminal results in the following output:
rvm rubies
=* ruby-2.2.3 [ x86_64 ]
# => - current
# =* - current && default
# * - default
Okay, great. I have Ruby 2.2.3 installed. Let's try bundle update:
Installing rack 2.0.0.alpha (was 1.6.4)
Gem::InstallError: rack requires Ruby version >= 2.2.2.
Okay, that's weird. What version of ruby do I have? Running ruby -v gives me this:
ruby 2.1.5p273 (2014-11-13) [x86_64-linux-gnu]
So... do I have 2.2.3 or not? What gives?
Since you are using bundle, I would suggest you to check your Gemfile for ruby version. You can also test it with bundle exec ruby -v
Also try:
rvm use ruby-2.2.3
bundle exec ruby -v
Maybe by setting the default Ruby version on rvm to the one you have (ruby-2.2.3) solves the problem, by doing rvm --default use ruby-2.2.3. Then reload the bash and execute ruby -v to check if the default version of Ruby was changed properly and then try again to execute the bundle install command.
If you don't know zsh and oh-my-zsh, I highly recommend for this kind of things. You could configure the terminal in order to show you the current version of Ruby and Rails that you're using every moment. Check it here: http://ohmyz.sh/
In addition to doing rvm use --default 2.2.3 or rvm use 2.2.3 make sure that you don't have the ruby package from apt (or whatever package manager) still installed. For some reason, that ruby package could take precedence over an RVM Ruby.
Also, try doing rvm uninstall 2.1.5 to force your system to default to 2.2.3... You can always reinstall 2.1.5 later and, if this issue persists, 2.2.3 should stick as your default.
I just cloned my Rails app onto my new computer. Ruby 2.0.0 seemed to install with no issue, but when I run sudo bundle install inside my app, I get an error telling me I have Ruby 1.9.3 installed:
$ sudo bundle install
Your Ruby version is 1.9.3, but your Gemfile specified 2.0.0
and bundle install returns this:
$ bundle install
/home/user/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- bundler (LoadError)
from /home/user/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /usr/bin/bundle:7:in `<main>'
I don't understand why I would have 1.9.3 installed. I used the command rvm install 2.0.0 to install Ruby.
Also, ruby -v returns:
ruby 2.0.0p643 (2015-02-25 revision 49749) [x86_64-linux]
What's going on?
Output of rvm list
$ rvm list
rvm rubies
=* ruby-2.0.0-p643 [ x86_64 ]
# => - current
# =* - current && default
# * - default
Because you're using rvm, you shouldn't ever need to use sudo on any of your commands. Using sudo is likely running the globally installed 1.9.3 version.
If you just installed Ruby 2.0.0 and haven't done anything else, then you most likely need to install bundler first before using it:
gem install bundler
Once you've done that, bundle install (without sudo) should work fine.
I have a Middleman project in an Ubuntu 14.04 machine and I just want to run bundle exec middleman build using a per-project ruby version. So in the root folder of the project I have a .ruby-version with this content: ruby-2.2.0.
rvm list shows
rvm rubies
* ruby-1.9.3-p551 [ x86_64 ]
ruby-2.1.4 [ x86_64 ]
=> ruby-2.2.0 [ x86_64 ]
Which seems fine. But ruby -v shows ruby 1.9.3p484 and that middleman command fails because it uses the wrong ruby version
$ bundle exec middleman build
bash: /usr/local/bin/bundle: /usr/bin/ruby1.8: bad interpreter: No such file or directory
So, how can I make sure that middleman uses the ruby version defined in the project folder ?
Your rvm is using ruby version -1.9.3 . You have to type rvm --default use 2.2.0 and after that you can check the active version of ruby by typing rvm list
If there is a * sign near the ruby version 2.2.0 then it is using it for default usage . And I hope you will be able to fix this problem.
I'm getting the following bug when I run rails c:
Your Ruby version is 2.1.2, but your Gemfile specified 2.2.2
When I run $rvm list rubies, I get the following:
rvm rubies
=* ruby-2.2.2 [ x86_64 ]
I am confused. I tried to change the Ruby version in the Gemfile to 2.1.2 and install ruby-2.1.2. However I still get:
Your Ruby version is 2.2.2, but your Gemfile specified 2.1.2
Any suggestions?
Please install ruby-2.2.2 on your system then do either one of these:
1. rvm use ruby-2.2.2
2. create a .ruby-version file inside your application root folder with the following content:
2.2.2
Try this:
$ rm Gemfile.lock
$ bundle
Neither answer worked for me, and I already had 2.2.2 installed and specified in .ruby-version. What worked for me was
rvm use 2.1.2
rvm use 2.2.2
and then everything works fine. I suspect that rvm was somehow confused.
Declaration: In reality, I had this problem with swapping between 2.5.9 and 2.7.3.
Bundle fails to install better_errors.
Gem::InstallError: better_errors requires Ruby version >= 2.0.0.
An error occurred while installing better_errors (2.0.0), and Bundler cannot continue.
Make sure that `gem install better_errors -v '2.0.0'` succeeds before bundling.
But gem install better_errors works fine.
ruby --version says ruby 2.0.0p353 (2013-11-22 revision 43784) [x86_64-linux-gnu]. I already tried upgrading to 2.1 but still not working.
Any suggestions?
I had this same problem. In my case, the bundler script had
#!/usr/bin/ruby
as the initial line in the script. As a result, it was calling the system (non-rbenv) version, which was 1.9.1 (in Linux Mint)
It's pretty hacky but changing that first line by running
sudo nano /usr/local/bin/bundle
to the full path for the rbenv shim (in my case):
#!/home/$YOUR_USERNAME/.rbenv/shims/ruby
solved the problem.
Hi for all the people who have different versions of ruby in their machine, and even if
rvm use ruby-version doesn't work.
Try this,
rvm list this will specify all the ruby version in your machine.
rvm rubies
* ruby-1.9.3-p484 [ x86_64 ]
ruby-2.1.0-preview2 [ x86_64 ]
ruby-2.1.1 [ x86_64 ]
=> ruby-2.1.5 [ x86_64 ]
In your project root folder, just create a file
.ruby-version
and add the ruby version you are planning to use.
ruby-2.1.5
Thats it, restart your application and try reinstalling your gems. :)
If you use rvm, make sure you don't have an .rvmrc file at the root of your project that force ruby < 2.0 to run, same with rbenv and .ruby-version file