I am trying to access the contents of the webpage of a target URL using the code:
def fetch_url(url)
r = Net::HTTP.get_response( URI.parse( url ) )
(r.is_a?(Net::HTTPSuccess)) ? r.body : nil
end
However, for some reason Rails is not able to identify Net, which is a Ruby module from v. 1.9.2 -- why would this be (I used require 'Net' at the top of my code)?
LoadError in PagesController#home
no such file to load -- Net
It's not require 'Net'. You need this:
require 'net/http'
Related
I want to write spec for my rubocop custom cop. This gem has handy helpers defined here. I want to require it. How to achieve what?
I've tried to use Gem.find_files, and this gives me ability to require any file in that gem, but only under lib directory.
For example:
# this requires ...gems/rubocop-0.29.1/lib/rubocop/formatter/formatter_set.rb
require Gem.find_files('rubocop/formatter/formatter_set.rb').first
# but I need ...gems/rubocop-0.29.1/spec/support/cop_helper.rb
The following describes why I need it. I have spec/rubocop/my_custom_cop_spec.rb
require 'spec_helper'
require ? # What I should I write?
RSpec.describe RuboCop::Cop::Style::MyCustomCop do
it 'some test' do
inspect_source(cop, 'method(arg1, arg2)') # This helper I want to use from rubocop spec helpers
end
end
When I try plain require:
require 'rubocop/spec/support/cop_helper'
I receive error:
/home/user/.gem/ruby/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274
:in `require': cannot load such file -- rubocop/spec/support/cop_helper
I found a solution that I think is a little more syntactically elegant:
gem_dir = Gem::Specification.find_by_name("my_gem").gem_dir
require "#{gem_dir}/spec"
I was so blinded, I already have path to file and able to get relative from it.
require 'pathname'
rubocop_path = Pathname.new(Gem.find_files('rubocop.rb').first).dirname
rubocop_path # => ...gems/rubocop-0.29.1/lib
require "#{rubocop_path}/../spec/support/cop_helper.rb"
I'm having trouble using the Ruby URI module's encode_www_form method in a modular Sinatra app. For some reason, URI is interpreted as being the URI::Parser subclass, and so the method call understandably fails.
I've reduced this to a minimal test case. The Gemfile:
source 'https://rubygems.org'
ruby '1.9.3'
gem 'sinatra'
And app.rb:
require 'sinatra/base'
class Frontend < Sinatra::Base
get '/test/' do
URI.encode_www_form(:a => 1, :b => 2)
end
run! if app_file == $0
end
If I then run ruby app.rb and access /test/ I get:
NoMethodError - undefined method `encode_www_form' for #<URI::Parser:0x007fa9221ca868>:
app.rb:6:in `block in <class:Frontend>'
If I convert it to a classic-style Sinatra app, so that app.rb is like this:
require 'sinatra'
get '/test/' do
URI.encode_www_form(:a => 1, :b => 2)
end
Then call ruby app.rb and access /test/, the page shows "a=1&b=2" as desired.
So what's going wrong in the modular format that means something's up with URI?
The class Sinatra::Base redefines URI on line 856 of https://github.com/sinatra/sinatra/blob/master/lib/sinatra/base.rb, which is why your URI reference gets evaluated as that value.
If you want to avoid this problem, you can change your reference to ::URI.
As of Sinatra 1.4.4, the URI module is no longer overwritten.
I tried to reproduce this in irb. This may sound stupid, but require 'uri' did the trick there.
You can see everything in the file structure at github.com/ddd1600/simple_angel
I'm getting alot of errors while trying to create a ruby application (soon to be a gem) "the correct way", viz. by thoroughly dividing the logic into classes and "loader files" and all of that. Point is, I know how to do this code the simpler way, without obeying OO principles, but I want to do it "correctly".
So, first of all, the file structure is as follows---
root folder = ~/Develop/simple_angel
inside /simple_angel
- /lib
- Gemfile
- Rakefile
- simple_angel.gemspec
inside /lib
- simple_angel.rb
- /simple_angel
inside /lib/simple_angel
- company.rb
- search.rb
- version.rb
But, here are some basics.
Here is what I'm calling to run this program from the terminal (PATH when running is ~/Develop/simple_angel)
ruby -Ilib lib/simple_angel/search.rb
Here is search.rb
#these 'requires' are supposed to be loaded in lib/simple_angel.rb, so here I show
#them commented out
#
#require 'rubygems'
#require 'httparty'
#require 'json'
#require 'company'
module SimpleAngel
class Search
SEARCH_URL = "http://api.angel.co/1/startups"
def search(user_input)
response = HTTParty.get("#{SEARCH_URL}/#{user_input}")
parsed_response = JSON.parse(response.body)
Company.new(parsed_response)
end
end
s = SimpleAngel::Search.new
s = Search.new
x = s.search(6702)
p x
end
Here is the "loader" file, lib/simple_angel.rb (PS: what is a more formal title for this sort of file?)
require 'httparty'
require 'json'
require 'simple_angel/search'
require 'simple_angel/version'
require 'simple_angel/company'
module SimpleAngel
end
Lastly, when I (again), run "ruby -Ilib lib/simple_angel/search.rb" (with all of search.rb's 'requires' commented out (^&^), this is my error message:
[ddouglas#coders:~/Develop/simple_angel on master]
% ruby -Ilib lib/simple_angel/search.rb
lib/simple_angel/search.rb:15:in `search': uninitialized constant SimpleAngel::Search::HTTParty (NameError)
from lib/simple_angel/search.rb:24:in `<module:SimpleAngel>'
from lib/simple_angel/search.rb:8:in `<main>'
^&^ - now that we're all up to speed here, I might as well include the error that happened when I left search.rb's "requires" in place
% ruby -Ilib lib/simple_angel/search.rb ✹
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- company (LoadError)
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from lib/simple_angel/search.rb:6:in `<main>'
I can't say I understand the point the class is trying to make regarding splitting up your files.
The first error (uninitialized constant SimpleAngel::Search::HTTParty) is because from within SimpleAngel::Search, you call HTTParty. Try changing that to ::HTTParty to specify the root namespace.
The big picture issue, looking back on this issue, was that I probably just needed to activate my /lib folder within rails via this addition to config/application.rb
config.autoload_paths += Dir["#{config.root}/lib/**/"]
from there, code can be directly loaded via the file_name.rb => FileName class system from anywhere within rails
I'm trying to initialize a variable called proxy like this:
proxy = Savon::Client.new "http://192.168.1.1:8080"
The thing is, when I run my code, I only get the error:
NameError: uninitialized constant NameOfTheClass::Savon
Thanks for any help!
PD: I'm using Ruby 1.9.2
PD2: I'm trying to run this from console.
You found probably the documentation for versions < 0.8.x.
Unfortunately the syntax has changed! Have a look here: https://github.com/rubiii/savon/blob/master/README.md
Savon works with blocks now.
Your example should now look like this
require 'savon'
require 'pp'
proxy = Savon::Client.new do
wsdl.document = "http://my.webservices.net/service?wsdl"
end
pp proxy.wsdl.soap_actions
I am in an environment where I don't have access to install any gems. I only have standard ruby (version:1.8.7) installation.
I am trying something like this:
require 'rss/1.0'
require 'rss/2.0'
require 'open-uri'
source = "http://www.example.com/feed.atom" # url or local file
content = "" # raw content of rss feed will be loaded here
open(source) do |s| content = s.read end
rss = RSS::Parser.parse(content, false)
When I am parsing the content, I am getting nil. So I am wondering if in-built RSS module supports parsing an atom feed.
If you look under RSS::Maker what it can parse.
As an alternative, consider trying the nokogiri gem.