I'd like to know what does the following line do:
World(::Cucumber::Rails::Capybara::SelectDatesAndTimes)
Because I'm getting
uninitialized constant Cucumber::Rails::Capybara::SelectDatesAndTimes::XPath (NameError)
And I don't understand what it is supposed to do to tell what's wrong :-)
EDIT: I gisted my Gemfile: https://gist.github.com/822480 and my gem list on windows vista 32-bit (https://gist.github.com/822483) and ubuntu maverick 32-bit https://gist.github.com/822491. Both are running ruby 1.8.7. Notice that I'm using this fork of cucumber-rails: https://github.com/johnf/cucumber-rails because my ultimate goal is to get these datetime selectors to work with capybara.
I also found that on Linux I get another error message:
Unable to find '#<XPath::Union:0xb6e078b8>' (Capybara::ElementNotFound)
The World() method isn't one from Ruby, it's one specifically from Cucumber, regrettably they haven't even documented it.
http://rubydoc.info/github/aslakhellesoy/cucumber-rails/master/Cucumber/Rails/World:initialize
In this case, it looks like something it missing from your Environment, maybe Caprybara, please give more info, and share your Ruby/Rails/Cucumber/Bundler/etc versions, and your Gemfile.
World is just an instance of Object that you can use in every step definition, its like a library that you expose without the need to import (or require in every step definition file).
see more at: https://github.com/cucumber/cucumber/wiki/Configuring-the-Scenario-Execution-Context-(World)
(Note that I'm still learning, so this may be wrong.)
A world-level method involves multiple objects versus a class- or object-specific method.
If you are having an issue with calling a world method, then check to see if the world method is specifying an object that can't be found.
Related
NOTE: the question was edited to reflect the issue.
i would like to work with knife-api rubygem. enclosed a snippet of my code
require 'chef'
require 'chef/knife'
require 'knife/api'
module X
module Y
module Z
include Chef::Knife::API
def self.foo
resp = knife_capture :search, ['*:*']
puts resp
end
end
end
end
when X::Y::Z.foo is called, it returns
gems/knife-api-0.1.7/lib/knife/api.rb:41:in `ensure in knife_capture': undefined local variable or method `revert_io_channels' for X::Y::Z (NameError)
it appears that he enclosing scope functions (Chef::Knife within knife-api) are inaccessible within X::Y::Z.foo.
how should i make this work?
In a complete non-answer, do not use the knife-api gem. It should not exist. The correct gem to use if you want to access Chef API data from Ruby code is chef-api (I know, we're real creative with names). If you want to do something very small, check out the knife exec command which just exposes the raw Chef object API (not as refined as chef-api, but built in).
This gem is a fork of another project that is no longer maintained. Looking at the gem code, it appears there were several issues introduced to the latest version (0.1.7) through some bad refactoring of the original code. That version was released a year ago and it hasn't had any commits since. The repo also does not accept issue tickets, and it has no tests. If you must use this gem, I would try a pessimistic constraint gem 'knife-api', '< 0.1.7' and see if that works. However it might be a better idea to skip it entirely. I made an attempt to fix the issues and submit a PR. You can also try pulling the gem from my forked repo https://github.com/msimonborg/knife-api
I'm just trying to understand how to use particular ruby gems. For example, take this reddit gem. It says to have this code to start:
require 'snoo'
# Create a new instance of the client
reddit = Snoo::Client.new
# Log into reddit
reddit.log_in 'Username', 'Password'
# Send a private message to me (Paradox!)
reddit.send_pm 'Paradox', 'Snoo rubygem rocks!', "Hey Paradox, I'm trying your Snoo rubygem out and it rocks. Thanks for providing such an awesome thing!"
# Log back out of reddit
reddit.log_out
Great but in the documentation you can see that the Client class doesn't have very many exciting functions. The exciting functions are in the Account class but there is no way to get to it...because if I try something like this
reddit = Snoo::Account.new
I get this error:
`initialize': undefined method `new' for Snoo::Account:Module (NoMethodError)
Okay so there's no new method but how do I make an Account object and use its functions like log_in?
Snoo::Account is a Ruby Module, and has been mixed in to Snoo::Client already by the gem. All the functions of Snoo::Account are already available to you on the reddit object.
The synopsis documentation in the readme doesn't make this very clear. But otherwise the documentation on the gem looks good to me.
Taking a short look at the source code on github makes me believe this is a fault in the documentation, as client clearly includes the functionality of many other modules, including the Account module you would like to access. In your example code, try the following methods to confirm it for yourself:
reddit.methods.sort
reddit.is_a? Snoo::Account
I assume the documentation software didn't catch the includes as they were executed using a block.
We use Jira/Confluence as our wiki site. I've had a difficult time trying to figure out how to use the add. I'm guessing i'm missing something very obvious. When I go to this site: https://confluence.atlassian.com/display/DISC/Confluence4r to download the confluence4r file, not sure what I'm supposed to do thereafter. The file contains a module which makes sense why it doesn't do anything when running it. But should I being using the gem install functionality in some way? When I simply try to use it in a ruby script, i get the following error:
conf.rb:15:in `<main>': uninitialized constant Confluence (NameError)
Where I am supplying the information required per the script (URL, user & pass contained the correct values when used):
server = Confluence::Server.new("https://collab.sitename.com")
server.login("user", "pass")
puts server.getSpaces()
Any information how to get the working is appreciated.
Confluence4r isn't distributed as a rubygem, it's just a ruby script you can drop onto your filesystem and reference directly.
If you put Confluence4r.rb in the same directory as your own script, you'd need to require it like this:
require './confluence4r.rb'
You shouldn't need the "confluence" and "confluence-client" rubygems to use confluence4r; it's just a very thin wrapper around the Confluence XML-RPC API.
I have changed this question to better reflect what it is I do not understand.
For example if I try to access the methods in the railties class AppBuilder.
require 'rails/generators/rails/app/app_generator'
g = Rails::AppBuilder.new
puts g.rakefile.inspect
I get an error message activesupport-3.1.3/lib/active_support/secure_random.rb:5:in `': uninitialized constant SecureRandom (NameError)
I do not understand this. Should not each class be "independent" from other classes? Is that not the whole point of object oriented programing?
And now If it is not so more importantly how can I figure out what dependences I need to add? Is it some kind of workflow to solve this? Can I somehow figure out what dependencies to add looking at the documentation? Do this problem have something to do with load path? Can I load all dependences from a gem or rails or whatever? I just don't get it!
doc: http://api.rubyonrails.org/classes/Rails/AppBuilder.html github: https://gist.github.com/rails/rails/blob/master/railties/lib/rails/generators/rails/app/app_generator.rb
there is no easy way to find out which dependencies are used within AppBuilder, cause most of the dependencies are setup somewhere else. so most of the times you need to do some trial and error to get the dependencies right.
the code that you posted has bad style. please get familiar with how to write ruby code properly. buy yourself a book i.e. eloquent ruby or just start reading ruby blogs.
dependencies in ruby is quite simple. every file that you require will be loaded and the load will recurse through the files and then load other requires. the loading will only work if all the required files are on the load path. this load path is similar to your system path and you can add directories to it to tell ruby where to look for files.
in general, there are dedicated entry-points for libraries and their dependencies. those are normally documented, so that if you use them, you get all dependencies right from the beginning. an example for this would be to require 'rails' in order to use rails or require 'active_support/all' if you just want to use active-support. if you wan't to chery-pick files/classes than you are on your own finding out which other classes you need. that part has nothing to do with oop, it's more an dependency-issue (other languages have explicit decleration of dependencies).
in your case, the next step would be to add require "securerandom" to the beginning of your file and then check wich error comes up next.
Whenever two concurrent HTTP requests go to my Rails app, the second always returns the following error:
A copy of ApplicationController has been removed from the module tree but is still active!
From there it gives an unhelpful stack trace to the effect of "we went through the standard server stuff, ran your first before_filter on ApplicationController (and I checked; it's just whichever filter runs first)", then offers the following:
/home/matchu/rails/torch/vendor/rails/activesupport/lib/active_support/dependencies.rb:414:in
`load_missing_constant'
/home/matchu/rails/torch/vendor/rails/activesupport/lib/active_support/dependencies.rb:96:in
`const_missing'
which I'm assuming is a generic response and doesn't really say much.
Google seems to tell me that people developing Rails Engines will encounter this, but I don't do that. All I've done is upgrade my Rails app from 2.2 (2.1?) to 2.3.
What are some possible causes for this error, and how can I go about tracking down what's really going on? I know this question is vague, so would any other information be helpful?
More importantly: I tried doing a test run in a "production" environment just now, and the error doesn't seem to persist. Does this only affect development, then, and need I not worry too much?
This is a bug in Rails 2.3.3:
https://rails.lighthouseapp.com/projects/8994/tickets/2948-exception-a-copy-of-actorscontroller-has-been-removed-from-the-module-tree-but-is-still-active
There is a patch for it (but incomplete?) in 2-3-stable:
http://github.com/rails/rails/commit/d37ac7958fc88fdbf37a8948102f6b4e45c530b3
You have a few options to address the problem:
Revert to Rails 2.3.2, wait for 2.3.4 to come out, probably at the end of August. 2.3.3 has a couple bad issues, so that might be best.
The problem should not happen in production mode, nor will it happen in development mode under the Thin server. If you are having this issue on Google Engines in production mode, the patch is your only hope. If it's only in dev mode, you can just run your local server with Thin instead of Mongrel.
If it is Google Engines, you can move off of Google Engines and host your app another way. This seems like a lot of work though.
Best of luck, this is a really bad bug many people are running into.
I addition to the workarounds mentioned in the other answers, I have encountered two others:
Add "config.cache_classes = false" to your config/environments/development.rb file. This has the unfortunate side effect of requiring you to restart your server whenever you want to see your changes.
Add 'unloadable' inside your controller classes in your engine. See http://strd6.com/?p=250 and http://dev.rubyonrails.org/ticket/6001
I haven't tried the second approach, since I found the other solution first, but there is of course a trade-off between avoiding having to edit plugin code, which may be reverted if a newer version of the plugin is downloaded, and then the ease of development provided by not having to restart the development server all the time in the second solution.
i faced with same problem for my new engine on rails 2.3.4 and i found solution here.
calling unloadable method solved my problem.
Weird.
Trying running "rake rails:update" to make sure the configs are scripts are up to date. You may have to check the existing ones against a template application.
i had this error and from memory it was one of one of these three things that fixed it.
1) I needed to update mongrel/rack
2) I had an environment variable from restful authentication that i had moved into the production.rb and development.rb files from the environment.rb - shifting it back to environment.rb seemed to help
3) will_paginate was out of date
We called out to an activerecord model in a namespaced module which overrides the "name" class method. Rails expects that the name method returns Product::Categories::MilkProducts::Firstproduct but gets just Firstproduct and throws an error. So if you get this error first check if you redefined self.name.
Firstproduct.method(:name).owner should be Module
Firstproduct.method(:name).source_location
source:
module Product::Categories::MilkProducts
class Base
def self.name
self.to_s.demodulize
end
end
class Firstproduct < Base
self.product = Product.first
end
end