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• In Ruby how do you sort one multi dimendional array by another multi dimensional array?

  - by Shreyas Satish

  Lets say I have an array : a=[[1,2,3],[4,5]] and I have another array : b=[[2.5,1.5,3.5],[1.5,2.5]] I need to sort 'a' with respect to 'b'. i.e the output should be = [[3,1,2],[5,4]] I tried but my code seemed to be very lengthy. It would be great if you could help me out.Thanks!

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• How to integrate Facebook the new Graph Api with Authlogic in Ruby on Rails?

  - by amrnt

  I've began with a new project using Authlogic system for Authorization. And I'm now wondering how could I connect Facebook oAuth sessions with my Authlogic session! First of all I want to use and Authlogic-oAuth Gems/Plugins, I what I want to use are just http://github.com/intridea/oauth2 and the interesting http://github.com/nsanta/fbgraph and associate them all with Authlogic. I tried using Authlogic with authlogic-connect extension, but It didnt fill up my needs. And I think the three of the amazing gems above togother will make things done in quality and as I want. Thanks in advance.

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• What do you call the << operator in Ruby when it's used for appending stuff?

  - by more or less

  In other contexts I know this << is called the bitshift operator. Is there a name for it when it's just used for append operations like you would do in an array or string (not sure what else you can append with it)? I'd like to be able to use an English word to refer to it instead of saying "you know, the operator with the two left arrows that's not really the left bitshift operator".

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• How can I generate zip file without saving to the disk with Ruby?

  - by flutedemetan

  I have generated many pdf files in memory and I want to compress them into one zip file before sending it as a email attachment. I have looked at Rubyzip and it does not allows me to create a zip file without saving it to disk (maybe I am wrong). Is there any way I can compress those file without creating a temp file ?

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• Good Starting Points for Optimizing Database Calls in Ruby on Rails?

  - by viatropos

  I have a menu in Rails which grabs a nested tree of Post models, each which have a Slug model associated via a polymorphic association (using the friendly_id gem for slugs and awesome_nested_set for the tree). The database output in development looks like this (here's the full gist): SQL (0.4ms) SELECT COUNT(*) AS count_id FROM "posts" WHERE ("posts".parent_id = 39) CACHE (0.0ms) SELECT "posts".* FROM "posts" WHERE ("posts"."id" = 13) LIMIT 1 CACHE (0.0ms) SELECT "slugs".* FROM "slugs" WHERE ("slugs".sluggable_id = 13 AND "slugs".sluggable_type = 'Post') ORDER BY id DESC LIMIT 1 Slug Load (0.4ms) SELECT "slugs".* FROM "slugs" WHERE ("slugs".sluggable_id = 40 AND "slugs".sluggable_type = 'Post') ORDER BY id DESC LIMIT 1 SQL (0.3ms) SELECT COUNT(*) AS count_id FROM "posts" WHERE ("posts".parent_id = 40) CACHE (0.0ms) SELECT "posts".* FROM "posts" WHERE ("posts"."id" = 13) LIMIT 1 CACHE (0.0ms) SELECT "slugs".* FROM "slugs" WHERE ("slugs".sluggable_id = 13 AND "slugs".sluggable_type = 'Post') ORDER BY id DESC LIMIT 1 Slug Load (0.4ms) SELECT "slugs".* FROM "slugs" WHERE ("slugs".sluggable_id = 41 AND "slugs".sluggable_type = 'Post') ORDER BY id DESC LIMIT 1 ... Rendered shared/_menu.html.haml (907.6ms) What are some quick things I should always do to optimize this from the start (easy things)? Some things I'm thinking now are: Can Rails 3 eager load the whole Post tree + associated Slugs in one DB call? Can I do that easily with named scopes or custom SQL? What is best practice in this situation? Not really thinking about memcached in this situation as that can be applied to much more than just this.

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• Is Prince the best way to PDF in Ruby on Rails?

  - by Angela

  After several Google searches, it appears that the way to create PDF's in Rails from HTML and CSS (versus a new markup language) is to use Prince. With licensing at $3800 for my non-big-commercial app, I'm wondering if this is, in fact, consensus or people have an alternative they can share the what's and how's.

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• using ruby test and selenium grid how can I keep the same browser window for multiple tests?

  - by George Horlacher

  Each of my tests start a new selenium client browser and tear it down so they can run stand alone with this code: def setup if $selenium @selenium = $selenium else @selenium = Selenium::SeleniumDriver.new("#$sell_server", 4444, "#$browser", "http://#$network.#$host:2086", 10000); @selenium.start end @selenium.set_context("test_login") end def teardown @selenium.stop unless $selenium assert_equal [], @verification_errors end What I'd like is to run a suite of tests that all use the same browser and don't keep opening and closing new browsers for every test. I've tried using $selenium as a global object / browser but each test still opens up a new browser and closes it. How should this be done?

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• has_one and has_many associations: which side of the association is saved first

  - by SeeBees

  I have three simplified models: class Team < ActiveRecord::Base has_many :players has_one :coach end class Player < ActiveRecord::Base belongs_to :team validates_presence_of :team_id end class Coach < ActiveRecord::Base belongs_to :team validates_presence_of :team_id end I use the following code to test these models: t = Team.new team.coach = Coach.new team.save! team.save! returns true. But in another test: t = Team.new team.players << Player.new team.save! team.save! gives the following error: > ActiveRecord::RecordInvalid: > Validation failed: Players is invalid > from > /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/validations.rb:1090:in > `save_without_dirty!' from > /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/dirty.rb:87:in `save_without_transactions!' from > /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:200:in > `save!' from > /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in > `transaction' from > /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:182:in > `transaction' from > /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:200:in > `save!' from > /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:208:in > `rollback_active_record_state!' from > /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:200:in > `save!' from (irb):14 I figured out when team.save! is called, it first calls player.save!. player needs to validate the presence of the id of the associated team. But at the time player.save! is called, team hasn't been saved yet, and therefore, team_id doesn't yet exist for player. This fails the player's validation, so the error occurs. But on the other hand, team is saved before coach.save!, otherwise the first example will get the same error as the second. So I've concluded that when a has_many bs, a.save! will save bs prior to a. When a has_one b, a.save! will save a prior to b. If I am right, why is this the case? It doesn't seem logical to me. Why has_one and has_many association have different order in saving? Any ideas? Thanks.

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• Ruby: How can I have a Hash take multiple keys?

  - by zxcvbnm

  I'm taking 5 strings (protocol, source IP and port, destination IP and port) and using them to store some values in a hash. The problem is that if the IPs or ports are switched between source and destination, the key is supposed to be the same. If I was doing this in C#/Java/whatever I'd have to create a new class and overwrite the hashcode()/equals() methods, but that seems error prone from the little I've read about it and I was wondering if there would be a better alternative here.

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• In Ruby, how can I initialize instance variables in new objects of core classes created from literal

  - by Ollie Saunders

  class Object attr_reader :foo def initialize @foo = 'bar' end end Object.new.foo # => 'bar' ''.foo # => nil //.foo # => nil [].foo # => nil I want them all to return 'bar' Am aware that you can do this already: class Object def foo 'bar' end end But I specifically want to initialize a state variable. Also note that this doesn't work. class String alias_method :old_init, :initialize def initialize(*args) super old_init(*args) end end class Object attr_reader :foo def initialize @foo = 'bar' super end end ''.foo # => nil Nor does this: class String attr_reader :foo def initialize @foo = 'bar' end end ''.instance_variables # => [] I'm beginning to think that this isn't actually possible.

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• Ruby: change each value in a hash with something like #collect for arrays?

  - by Adam Nonymous

  Hi! I'd like to replace each value in a hash with value.some_method. For example in a simple hash {"a" = "b", "c" = "d"} every value should be .upcase-d so it looks like {"a" = "B", "c" = "D"}. I tried #collect and #map but always just get arrays back. Is there an 'elegant' way to do this? Thanks in advance, Adam Nonymous UPDATE: Damn, I forgot: The hash is in an instance variable which should not be changed. I need a new hash with the changed values, but would prefer not to define that variable explicitly and then loop over the hash filling it. Something like new_hash = hash.magic {...} ;)

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• How to set session variables with app.get() in Ruby on Rails console?

  - by Vikrant Chaudhary

  How can I manually set session while calling app.get() in script/console? For example I want to access an authorised page, but it always redirects me to sign-in page. How can I set the session before calling app.get() so that I can make an authorised call to that page?

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• Ruby ROXML - how to get an array to render its xml?

  - by Brian D.

  I'm trying to create a Messages object that inherits Array. The messages will gather a group of Message objects. I'm trying to create an xml output with ROXML that looks like this: <messages> <message> <type></type> <code></code> <body></body> </message> ... </messages> However, I can't figure out how to get the message objects in the Messages object to display in the xml. Here is the code I've been working with: require 'roxml' class Message include ROXML xml_accessor :type xml_accessor :code xml_accessor :body end class Messages < Array include ROXML # I think this is the problem - but how do I tell ROXML that # the messages are in this instance of array? xml_accessor :messages, :as => [Message] def add(message) self << message end end message = Message.new message.type = "error" message.code = "1234" message.body = "This is a test message." messages = Messages.new messages.add message puts messages.length puts messages.to_xml This outputs: 1 <messages/> So, the message object I added to messages isn't getting displayed. Anyone have any ideas? Or am I going about this the wrong way? Thanks for any help.

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• Which Ruby gem should I use for updating a Twitter or Facebook status along with authlogic_rpx?

  - by Kevin

  Hi, My Rails webapp uses tardate's excellent authlogic_rpx gem so that users can register and sign in using their Twitter or Facebook account. Now I need to update a user Twitter or Facebook status. Which gem should I use for Twitter? and for Facebook? Or should I prefer Net::HTTP for both? Since the users authorised my app through authlogic_rpx, do I already have this authorised token to use the Twitter and Facebook APIs? If so, where can I find it? Thanks, Kevin

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• How do I upgrade from Ruby 1.8.6 to 1.8.7 on Windows?

  - by Angela

  On one machine I seemed to have upgrade to 1.8.7 -- mostly because of the TLS support for sending via Gmail -- but I don't remember how I did it, or what to do and have a laptop on Windows 7. How do I upgrade for the 1.8.6 from OneClick?

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• looping through a 2d array in ruby to display it in a table format?

  - by Sean

  Hi How can i represent a 2d array in a table format in the terminal, where it lines up the columns properly just like a table? so it looks like so: 1 2 3 4 5 1 [ Infinity | 40 | 45 | Infinity | Infinity ] 2 [ Infinity | 20 | 50 | 14 | 20 ] 3 [ Infinity | 30 | 40 | Infinity | 40 ] 4 [ Infinity | 28 | Infinity | 6 | 6 ] 5 [ Infinity | 40 | 80 | 12 | 0 ] instead of: [ Infinity,40,45,Infinity,Infinity ] [ Infinity,20,50,14,20 ] [ Infinity,30,40,Infinity,40 ] [ Infinity,28,Infinity,6,6 ] [ Infinity,40,80,12,0 ]

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• Ruby: Is there a way to split a string only with the first x occurrencies?

  - by zxcvbnm

  For example, suppose I have this: 001, "john doe", "male", 37, "programmer", "likes dogs, women, and is lazy" The problem is that the line is only supposed to have 6 fields. But if I separate it with split I get more, due to the comma being used improperly to separate the fields. Right now I'm splitting everything, then when I get to the 5-th index onward I concatenate all the strings. But I was wondering if there was a split(",",6) or something along these lines.

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• Is Prince the best way to create PDFs in Ruby on Rails?

  - by Angela

  After several Google searches, it appears that the way to create PDFs in Rails from HTML and CSS (versus a new markup language) is to use Prince. With licensing at $3800 for my non-big-commercial app, I'm wondering if this is, in fact, consensus or people have an alternative they can share the whats and hows.

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• What is the meaning of "-" in blocks of server-side code in ruby on rails?

  - by mmacaulay

  I often see things like this in rails views: <% form_tag some_path do -%> <% end -%> Why is there a "-" at the end of each of those lines? My code works fine without it, but is it a best practice or some kind of security measure?

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• Is there a Rails plugin or Ruby gem that offers similar functionality to Django's built-in Admin Pag

  - by stephen murdoch

  Reading about Django, I saw this: http://docs.djangoproject.com/en/1.1/ref/contrib/admin/#ref-contrib-admin - the fancy simple to use admin page that django can magically create for you. Is there a plugin or gem offering similar functionality in Rails. Are there any plans to make Rails do this for you in the future?

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• Ruby on Rails: How to find all items with a hash that contain a specific value...

  - by kingjeffrey

  Suppose I have three models: Student, SchoolClass, and DayOfWeek. There is a HABTM relationship between Student and SchoolClass, and between SchoolClass and DayOfWeek. What I'd like to do is find all school classes belonging to a given student that meet on Monday. Now I suppose I could do something like: @student = Student.find(:student_id) @student_classes = @student.school_classes.find(:all) @student_classes_on_monday = Array.new @student_classes.each do |student_class| if student_class.day_of_week.include?("Monday") @student_classes_on_monday << student_class end end But there has to be a more elegant way. Can you help me find it?

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• Copying a massive databse for local ruby on rails development?

  - by tesmar

  Hi guys, There is a massive database (GB) that I am working with now and all of the previous development has been done on a slicehost slice. I am trying to get ready for more developers to come in and work so I need each person to be able to setup his own machine for development, which means potentially copying this database. Selecting only the first X rows in each table to cut size could be problematic for data consistency. Is there any way around this, or is a 1 hour download for each developer going to be necessary? And beyond that, what if I need to copy the production DB down for dev purposes in the future? Sincerely, Tyler

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• What does the ruby operator ||= in the following function do?

  - by Milton K Benjamin

  def f1 @f1 ||= "abc" end

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• In Ruby's Test::Unit::TestCase, is there a way for a test method to access the total number of metho

  - by someguy

  i.e. as I compose my test suites to include other suites as well as test cases, is there a global count of how many tests the TestRunner has executed, will be executing? Any way I can progammatically access that count?

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• What is an elegant way to solve this max and min problem in Ruby or Python?

  - by ????

  The following can be done by step by step, somewhat clumsy way, but I wonder if there are elegant method to do it. There is a page: http://www.mariowiki.com/Mario_Kart_Wii, where there are 2 tables... there is Mario - 6 2 2 3 - - Luigi 2 6 - - - - - Diddy Kong - - 3 - 3 - 5 [...] The name "Mario", etc are the Mario Kart Wii character names. The numbers are for bonus points for: Speed Weight Acceleration Handling Drift Off-Road Mini-Turbo and then there is table 2 Standard Bike S 39 21 51 51 54 43 48 Out Bullet Bike 53 24 32 35 67 29 67 In Bubble Bike / Jet Bubble 48 27 40 40 45 35 37 In [...] These are also the characteristics for the Bike or Kart. I wonder what's the most elegant solution for finding all the maximum combinations of Speed, Weight, Acceleration, etc, and also for the minimum, either by directly using the HTML on that page or copy and pasting the numbers into a text file. Actually, in that character table, Mario to Bower Jr are all medium characters, Baby Mario to Dry Bones are small characters, and the rest are all big characters, except the small, medium, or large Mii are just as what the name says. Small characters can only ride small bike or small kart, and so forth for medium and large.

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