I'm writing a Chef cookbook to deploy and application and create users. It doesn't have an API, and uses an odd hashing method, so I've written a short library module for it. I've included only the makeSalt() method below for the sake of brevity.
module Foo_packagist
module Password
def makeSalt(len=31)
require 'securerandom'
return Digest.hexencode(SecureRandom.random_bytes((len*6/8.0).ceil)).to_i(16).to_s(36)[0..len-1]
end
end
end
The trouble is that in every Chef run I get:
NoMethodError
-------------
undefined method `makeSalt' for Foo_packagist::Password:Module
and debugging in chef-shell I get:
chef (12.4.0)> puts ::Foo_packagist::Password.instance_methods()
makeSalt
encodePassword
chef (12.4.0)> puts ::Foo_packagist::Password.makeSalt()
NoMethodError: undefined method `makeSalt' for Foo_packagist::Password:Module
chef (12.4.0)> puts ::Foo_packagist::Password::makeSalt()
NoMethodError: undefined method `makeSalt' for Foo_packagist::Password:Module
What is the right way to call this method?
Change that to def self.makeSalt. That's the Ruby syntax for a module-level method.
Try this ->
module Foo_packagist
module Password
def self.makeSalt(len=31)
require 'securerandom'
return Digest.hexencode(SecureRandom.random_bytes((len*6/8.0).ceil)).to_i(16).to_s(36)[0..len-1]
end
end
end
Then to call it would be this->
Foo_packagist::Password.makeSalt()
Related
I'm currently trying to run a Rake task in a Ruby project (No Rails). What I am trying to accomplish is to run a method from a file within my Ruby project. However I get the following error:
undefined method `namespace' for main:Object (NoMethodError)
I created a folder task that holds a test.rb file. Before I had it as test.rake but I think this was incorrect. I also created a Rakefile pointing to task/test.rb
For redeability, I'm using namespace: although I'll be honest I'm not sure if I even need it.
#Rakefile
task :default => [:test]
task :test do
ruby 'task/test.rb'
end
Here is the task.test.rb
require './src/lambda_function.rb'
class KMS
def initialize
end
def decrypt(key)
return "some password"
end
end
class SNS
def initialize
end
end
TEST_FORM_ID=123
namespace :test do
namespace :lambda do
desc 'Run the Lambda process function'
task :process do
LambdaFunctions::LambdaHandler.process(box_api: BoxApi.new,
form: TEST_FORM_ID,
sns: SNS.new,
kms: KMS.new)
end
end
end
What I'm I doing wrong?
I have the HTTParty gem on my system and I can use it from within rails.
Now I want to use it standalone.
I am trying:
class Stuff
include HTTParty
def self.y
HTTParty.get('http://www.google.com')
end
end
Stuff.y
but I get
$ ruby test_httparty.rb
test_httparty.rb:2:in `<class:Stuff>': uninitialized constant Stuff::HTTParty (NameError)
from test_httparty.rb:1:in `<main>'
07:46:52 durrantm Castle2012 /home/durrantm/Dropnot/_/rails_apps/linker 73845718_get_method
$
You have to require 'httparty':
require 'httparty'
class Stuff
include HTTParty
# ...
end
Its all because of the include which exists with in the class
If you include a class with a module, that means you're "bringing in" the module's methods as instance methods.
If you need more clarity on include and require
I request you to refer to this wonderful SO Posting
What is the difference between include and require in Ruby?
Here is an example which I have taken from the same posting
module A
def say
puts "this is module A"
end
end
class B
include A
end
class C
extend A
end
B.say => undefined method 'say' for B:Class
B.new.say => this is module A
C.say => this is module A
C.new.say => undefined method 'say' for C:Class
I opened irb & entered:
require 'test/unit'
but when I used the assert_equal method, I got following error: NoMethodError: undefined method 'assert_equal' for main:Object. Why is this happening even after requiring 'test/unit' ?
assert_equal is defined on subclasses of Test::Unit::TestCase, so are only available in that class. You may have some success with include Test::Unit::TestCase to load those methods onto the current scope.
More likely you could be better writing your tests in a short file, and running them with ruby ./my_file.rb
You can use in built ruby error testing
raise "Message you want to throw when error happens" if/unless "Condition when you want to throw the error "
OR
If you get error messages when trying to use assertions, like "NoMethodError: undefined method `assert' for main:Object", then add this to the top of your script:
require "test/unit/assertions"
include Test::Unit::Assertions
This is how assertions are used:
class Gum
def crisis; -42 end
end
# and as for testing:
require 'test/unit'
class GumTest < Test::Unit::TestCase
def test_crisis
g = Gum.new
assert_equal -42, g.crisis
end
end
I'm trying to do some monkey patching in ActiveShipping UPS class .
I need to add a class level method (starting with .self), so here it's what I'm trying to do:
module ActiveMerchant
module Shipping
class UPS < Carrier
def self.process_request(receiver, sender, packages, options = {})
# some code
end
def regular_method
"foobar"
end
end
end
end
Unfortunately when I'm trying to use it:
ActiveMerchant::Shipping::UPS.process_request(receiver etc)
I get an error:
NoMethodError: undefined method `process_request' for ActiveMerchant::Shipping::UPS:Class
from (irb):6
from C:/Ruby19/bin/irb.bat:19:in `<main>'
There is no class method named process_request in original class.
In original UPS class provided in gem there is one static method defined self.retry_safe = true
and I can use it without errors.
I can also use regular_method after creating instance of UPS class.
More details provided:
I'm working with Rails 2.3 ( :-( ) and Ruby 1.9.2. I have no influce on environment.
Monkey patched code is under plugins/my_plugin/lib/active_shipping/ext/carriers/ups.rb
In /active_shipping I have file named extensions.rb in which i have:
require 'active_shipping'
require_relative 'ext/carriers'
require_relative 'ext/carriers/ups'
It deals with loading everything properly (I suppose basing on regular_method beheaviour from first chunk of code in my question).
I try to invoke process_request in one of my Controllers. This part is little tricky, beacuse i'm using sth like this:
MyModel.courier_service.process_request(parameters)
where courier_service, in this case holds the ActiveMerchant::Shipping::UPS class.
I'm still a newbie in Ruby and don't know what sort of details i should provide.
Maybe you want to do it in another way
File patch_classes.rb:
module ActiveMerchantExpand
module Shipping
module ClassMethods
def self.process_request(receiver, sender, packages, options = {})
# some code
end
end
module InstanceMethods
def regular_method
"foobar"
end
end
def self.included(receiver)
receiver.extend ClassMethods
receiver.send :include, InstanceMethods
end
end
end
Then you have to load your class "ActiveMerchant::Shipping::UPS"
and after that you can attach your methods to your class via
Rails.configuration.to_prepare do
require_dependency [[file for ActiveMerchant::Shipping::UPS]]
require 'patch_classes' )
ActiveMerchant::Shipping::UPS.send(:include, ::ActiveMerchantExpand::Shipping)
end
This is from rails plugin writing, i hope this helps.
regards tingel2k
Do you explicitly require file with your monkey patch? If you just put it under your app or lib path without requiring, it wouldn't load because constant ActiveMerchant::Shipping::UPS is defined in gem and it doesn't trigger dependency resolution mechanism.
Some popular blog sites typically use square brackets in their URLs but ruby's built-in URI.parse() method chokes on them, raising a nasty exception, as per:
http://redmine.ruby-lang.org/issues/show/1466
I'm trying to write a simple monkey-patch that gracefully handles URLs with the square bracket. The following is what I have so far:
require 'uri'
module URI
def self.parse_with_safety(uri)
safe_uri = uri.replace('[', '%5B')
safe_uri = safe_uri.replace(']', '%5D')
URI.parse_without_safety(safe_uri)
end
alias_method_chain :parse, :safety
end
But when run, this generates an error:
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.8/lib/active_support/core_ext/module/aliasing.rb:33:in alias_method: NameError: undefined method 'parse' for module 'URI'
How can I successfully monkey-patch URI.parse?
alias_method_chain is executed on the module level so it only affects instance methods.
What you have to do is execute it on the module's class level:
require 'uri'
module URI
class << self
def parse_with_safety(uri)
parse_without_safety uri.gsub('[', '%5B').gsub(']', '%5D')
end
alias parse_without_safety parse
alias parse parse_with_safety
end
end
#nil his comment is very helpful, we ended up with the following:
def parse_with_safety(uri)
begin
parse_without_safety uri.gsub(/([{}|\^\[\]\#`])/) {|s| URI.escape(s)}
rescue
parse_without_safety '/'
end
end