IRB not finding "rubygems"

[Brad Hutchins]

This an odd one.

require 'rubygems'

works in my scripts . . . but if I go to IRB to test some 'rspec' stuff.
I get:
=> false


Tried including the whole path, but that did not work either any ideas
why scripts being run don't have a problem requiring rubygems but IRB
does?


OSX 10.5.3
Ruby 1.8.6
Model Name: MacBook Pro 15"
Model Identifier: MacBookPro1,1
Processor Name: Intel Core Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 2 MB
Memory: 2 GB

 

[Stefano Crocco]

This an odd one.

require 'rubygems'

works in my scripts . . . but if I go to IRB to test some 'rspec' stuff.

I get:

=> false


Tried including the whole path, but that did not work either any ideas
why scripts being run don't have a problem requiring rubygems but IRB
does?


OSX 10.5.3
Ruby 1.8.6
Model Name: MacBook Pro 15"
Model Identifier: MacBookPro1,1
Processor Name: Intel Core Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 2 MB
Memory: 2 GB

The value returned by require doesn't tell whether there was an error or not
(if the file can't be found, a LoadError exception will be raised). Rather,
since require tries to avoid loading a file more than one time, it says
whether you required the file for the first time (true) or if it had already
been loaded (in this case returns false and doesn't try to load the file
again). So, the fact that in irb

require 'rubygems'

returns false only means that the file rubygems.rb had already been loaded,
and it wasn't necessary to load it a second time.

Stefano

 

[Iñaki Baz Castillo]

El Martes, 24 de Junio de 2008, Brad Hutchins escribi=C3=B3:

=3D> false

When you get "false" it means that library was **already** loaded. Example:

~$ irb
irb(main):001:0> require 'time'
=3D> true
irb(main):002:0> require 'time'
=3D> false


If the library doesn't exist in the configured path you would get an error:

irb(main):001:0> require 'non_existing_library'
LoadError: no such file to load -- non_existing_library
from (irb):1:in `require'
from (irb):1
from :0


=2D-=20
I=C3=B1aki Baz Castillo

 

[Brad Hutchins]

The value returned by require doesn't tell whether there was an error or
not
(if the file can't be found, a LoadError exception will be raised).
Rather,
since require tries to avoid loading a file more than one time, it says
whether you required the file for the first time (true) or if it had
already
been loaded (in this case returns false and doesn't try to load the file
again). So, the fact that in irb

require 'rubygems'

returns false only means that the file rubygems.rb had already been
loaded,
and it wasn't necessary to load it a second time.

Stefano

Hmmm . . . then I have a different problem.

on to requiring rspec

Bulk updating Gem source index for: http://gems.rubyforge.org
Updating metadata for 13 gems from http://gems.rubyonrails.org
.............
complete
Successfully installed rspec-1.1.4
1 gem installed
Installing ri documentation for rspec-1.1.4...
Installing RDoc documentation for rspec-1.1.4...
macbook-pro-15:~ $ irb

LoadError: no such file to load -- rspec
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in
`require'
from (irb):1

And this is the second time I have unistalled and re-installed rspec.

Tested other GEMs . . .
true

 

[Stefano Crocco]

Hmmm . . . then I have a different problem.

on to requiring rspec

Bulk updating Gem source index for: http://gems.rubyforge.org
Updating metadata for 13 gems from http://gems.rubyonrails.org
.............
complete
Successfully installed rspec-1.1.4
1 gem installed
Installing ri documentation for rspec-1.1.4...
Installing RDoc documentation for rspec-1.1.4...
macbook-pro-15:~ $ irb


LoadError: no such file to load -- rspec
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rub
ygems/custom_require.rb:27:in `gem_original_require'
from
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rub
ygems/custom_require.rb:27:in `require'
from (irb):1

That's because rspec doesn't provide a rspec.rb file but a spec.rb file. So

require 'spec'

should work.

Stefano