Is it possible to run an rspec on a file which requires other files?
my .rb file has the following lines:
require "colorize"
require "./board_initializer"
require "./pieces"
and when running a rake I get the following error:
.rvm/rubies/ruby-2.2.5/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- ./board_initializer (LoadError)
Thanks!
The error means board_initializer.rb isn't in the current working directory for __FILE__. Some ways to resolve this include:
Providing a valid filename argument to require.
Using require_relative with a valid relative path.
Modifying the current LOAD_PATH.
There are certainly other ways to resolve this, but they all amount to ensuring that board_initializer.rb can be found by the interpreter when you load or require the file.
Related
Try creating a gem based on bundler's official guide on developing a Ruby gem.
Running bundle gem foodie will create a structure and generate files in the lib directory:
foodie
version.rb
foodie.rb
foodie.rb reads
require "foodie/version"
module Foodie
# Your code goes here...
end
Running ruby lib/foodie.rb (or also from different directories) will result in
C:/Ruby23-x64/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- foodie/versio
n (LoadError)
from C:/Ruby23-x64/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from foodie.rb:1:in `<main>'
On the other hand installing the gem via rake install and then requiring the gem works just fine.
It works from source if require "foodie/version" is changed to require_relative "foodie/version" in foodie.rb. As I understand
require works based on modules
require_relative works based on directory structure
To me the latter looks like a hack. It'd no longer make sense to structure your code via modules as it wouldn't be enforced (maybe it'd still make sense but you could make mistakes and never notice).
My questions are:
Is it possible to test a gem from source without installing it while following the bundler convention (using require instead of require_relative)?
Why does the gem work after installed?
Is there any best practice for the usage of require, require_relative, modules, files and general structure?
Thank you.
You need to add your lib dir to Ruby’s load path. The load path is a list of directories that Ruby searches for files in when you call require. Rubygems also manages the load path when you are using gems, which is why your code works when installed as a gem.
You say “as I understand ... require works based on modules”, this is not correct. require works with files, it’s just convention that a class or module is defined in a file with a matching name, e.g. MyModule might be in my_module.rb.
There are a few ways to add a dir to the load path. From the command line you can use the -I option:
$ ruby -I lib lib/foodie.rb
If you wanted to avoid typing -I lib you could use the RUBYLIB environment variable. Ruby adds the contents of this to the load path:
$ export RUBYLIB=lib
$ ruby lib/foodie.rb
(On Windows I think you will need to use set rather than export.)
You can also manipulate the load path from withing the program itself. It is stored in the global variable $LOAD_PATH, aliased as :$. This is how Rubygems and Bundler manage your gems.
I just spent three days of my life banging my head against the wall trying to figure out why a simple 'rake' would not pass my spec file.
If this happens to you: Do not have a space in any folder path!. Seriously. In fact do not have a space in anything you name from here on out.
Here is my console output:
(in /Users/*****/Desktop/Learning Ruby/learn_ruby)
$ rake
/Users/*******/Desktop/Learning Ruby/learn_ruby/00_hello/hello_spec.rb:116:
in `require': cannot load such file -- hello (LoadError)
The failure is caused by the line: require "hello"
This line tells Ruby that it needs to search the load path for a file named hello.rb. However, when it looks at the load path, it can't find that file. You should either remove that line and define your code directly in the spec file, or create a hello.rb file.
Newer versions of RSpec (2.11+ I believe) automatically add subdirectory lib to the load path. Based on your Rakefile it seems you are also loading the current lab directory and the subdirectory solution.
I'm guessing you're expected to put your solution in solution/hello.rb.
What worked for me was changing the require statement to a require_relative
I am using windows and an IDE
have a problem with compressing my script.
I have a main.rb and some classes in subfolders like Subfolder/Class.rb
In my main.rb, I have the Classes declared like that:
require './Subfolder/Class.rb'
When I just run my main script, it works. Also my exe works, when it is in the same place as the main.rb.
But when I put the exe somewhere else I get this error:
C:/Users/MLEING~1/AppData/Local/Temp/ocr53C2.tmp/lib/ruby/site_ruby/1.9.1/rubyge
ms/custom_require.rb:36:in `require': cannot load such file -- ./Parsing/Calibra
tionState (LoadError) from C:/Users/MLEING~1/AppData/Local/Temp/ocr53C2.tmp/lib/ruby/site_ruby
/1.9.1/rubygems/custom_require.rb:36:in `require'
from C:/Users/MLEING~1/AppData/Local/Temp/ocr53C2.tmp/src/main.rb:9:in `
<main>'
Can I somehow put the dependencies into my exe?
I also tried to include them like that:
ocra main.rb Subfolder/*.rb
But it doesn't help.
Have you tried making a ruby gem out of your project? http://guides.rubygems.org/make-your-own-gem/
Gems define their own dependencies.
Your require is using a relative path from the current directory (which you can see because it starts with "./"
Instead, try:
require 'Subfolder/Class.rb'
And make sure $LOAD_PATH includes the location where all of your ruby code is unpacked (which you can look at by examining $0 (or figure out the full path from $0 and require the .rb with a full path)
Haven't touched Ruby for ages so this really puzzled me.
Started up irb.
Then first line I ran was:
require 'init'
and I got this back:
LoadError: no such file to load -- init
Any idea what I'm doing wrong?
The error message says it quite clearly:
no such file to load -- init
So, either there is no such file (init.rb, init.so, init.jar, init.rba, etc. depending on the exact implementation of Ruby you use) or the file is not in a directory that is on the $LOAD_PATH.
I'm new to ruby, but I'm working on my first ruby program. It currently has two files, one is a library of functions (xgync.rb stored in lib) the other is the executable xgync stored in 'bin'. (Project visible here https://bitbucket.org/jeffreycwitt/xgync/src) I've also created a symlink to my /usr/local/bin/xgync so that I can write the command xgync {arguments} from anywhere in the terminal.
The problem seems to be that bin/xgync depends on the library lib/xgync.rb. I've written this dependency in bin/xgync as follows:
$:.unshift(File.dirname(__FILE__) + '/../lib')
require "xgync"
However, i keep getting the following error:
/Users/JCWitt/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- xgync (LoadError)
from /Users/JCWitt/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /usr/local/bin/xgync:4:in `<main>'
can you see anything wrong with what I've written? Could the symlink be somehow messing things up?
Thanks for your help :)
When using ruby 1.9.x you don't usually alter the path with the $:.unshift when requiring other files in your project.
Instead the best practice is to use require_relative instead.
require_relative '../lib/xgync.rb'
require_relative requires files relative to the file you are currently editing.
But the error you experience appears, because you require a file, which does not exist:
bin/xgync
lib/xgync.rb
These are the files in your project according to your question, and the code-excerpt is from bin/xgync you extended the path to look for files in lib/ but you try to require 'xgync' which is a file, that is not present in lib/, so if you wanted to use this method (instead of require_relative you would have to use require 'xgync.rb'.