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  • RVM Ruby 1.9.1 troubles

    - by Casper
    Trying to get Ruby 1.9.1 up and running with RVM on a fresh install(fedora). So after doing rvm install 1.9.1, the rubygems error logs show that zlib can't be located no such file to load -- zlib (LoadError) However both the zlib runtime and development libraries are installed and up-to-date, So I'm kinda stumped on this one at the moment. Any suggestions?

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  • Ruby on Rails: Accessing production database data for testing

    - by williamjones
    With Ruby on Rails, is there a way for me to dump my production database into a form that the test part of Rails can access? I'm thinking either a way to turn the production database into fixtures, or else a way to migrate data from the production database into the test database that will not get routinely cleared out by Rails. I'd like to use this data for a variety of tests, but foremost in my mind is using real data with the performance tests, so that I can get a realistic understanding of load times.

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  • Ruby on rails active-record generated SQL on Postgres

    - by jpartogi
    Dear all, Why does Ruby on rails generated more queries in the background on Postgres than MySQL? I haven't tried deploying Rails on production with Postgres yet, but I am just afraid this generated queries would affect the performance. Do you find Rails with Postgres is slower than MySQL, knowing that it produce more query on the background? Or it is relatively the same?

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  • Understanding ruby array sort

    - by user257797
    I am having a problem understanding how array.sort{|x,y| block} works exactly,hence how to use it? ruby-doc example: a = [ "d", "a", "e", "c", "b" ] a.sort #=> ["a", "b", "c", "d", "e"] a.sort {|x,y| y <=> x } #=> ["e", "d", "c", "b", "a"] thanks

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  • Why ruby has to_s and inspect?

    - by prosseek
    The p calls inspect, and puts/print calls to_s for representing its object. If I run class Graph def initialize @nodeArray = Array.new @wireArray = Array.new end def to_s # called with print / puts "Graph : #{@nodeArray.size}" end def inspect # called with p "G" end end if __FILE__ == $0 gr = Graph.new p gr print gr puts gr end I get G Graph : 0Graph : 0 Then, why does ruby has two functions do the same thing? What makes the difference between to_s and inspect? If I comment out the to_s or inspect function, I get as follows. ##

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  • Understanding Ruby class vs instance methods

    - by randombits
    I have the following code: #!/usr/bin/ruby class Person def self.speak p = self.new puts "Hello" p.chatter end private def chatter puts "Chattering" end end p = Person.new Person.speak I'd like to make chatter private, accessible only within p.. but I want p to be able to access it within the class method. Is there a better way to design this so chatter isn't available to the public, but a "factory" method like self.speak can call chatter?

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  • Parse XHTML using Ruby

    - by Anant
    Is there any way I can parse a remote html page, in Ruby, preferably using jQuery like selectors? For example, I could select all the div having a specific class, and get the content of all those elements in an array. I was trying to use Regex for this, but I think using XML parser would be better.

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  • Ruby on Rails solution for scrubbing data of WYSIWYG editor user input

    - by Jimmy
    Hey everyone, I am working on a simple blogging type ruby on rails application and I have everything working through tinyMCE for a nice WYSIWYG editor so the user can add some simple things like images/youtube videos and lists. What I am looking for is a nice solution for blacklisting certain elements to be filtered out of the data when it is displayed. So is there a solution for this available as a gem or available to download anywhere? Thanks!

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  • Blocks and Yields in Ruby

    - by Matt
    I am trying to understand blocks and yields and how they work in Ruby. How is a yield used and most of the rails applications use yields in a weird way. Can someone explain to me or show me where to go to understand them.

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  • Financial Charts / Graphs in Ruby or Python

    - by Eric the Red
    What are my best options for creating a financial open-high-low-close (OHLC) chart in a high level language like Ruby or Python? While there seem to be a lot of options for graphing, I haven't seen any gems or eggs with this kind of chart. http://en.wikipedia.org/wiki/Open-high-low-close_chart (but I don't need the moving average or Bollinger bands) JFreeChart can do this in Java, but I'd like to make my codebase as small and simple as possible. Thanks!

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  • In Ruby, how does coerce() actually work?

    - by Jian Lin
    It is said that when we have a class Point and knows how to perform point * 3 like the following: class Point def initialize(x,y) @x, @y = x, y end def *(c) Point.new(@x * c, @y * c) end end point = Point.new(1,2) p point p point * 3 Output: #<Point:0x336094 @x=1, @y=2> #<Point:0x335fa4 @x=3, @y=6> but then, 3 * point is not understood: Point can't be coerced into Fixnum (TypeError) So we need to further define an instance method coerce: class Point def coerce(something) [self, something] end end p 3 * point Output: #<Point:0x3c45a88 @x=3, @y=6> So it is said that 3 * point is the same as 3.*(point) that is, the instance method * takes an argument point and invoke on the object 3. Now, since this method * doesn't know how to multiply a point, so point.coerce(3) will be called, and get back an array: [point, 3] and then * is once again applied to it, is that true? point * 3 which is the same as point.*(3) and now, this is understood and we now have a new Point object, as performed by the instance method * of the Point class. The question is: 1) who invokes point.coerce(3) ? Is it Ruby automatically, or is it some code inside of * method of Fixnum by catching an exception? Or is it by case statement that when it doesn't know one of the known types, then call coerce? 2) Does coerce always need to return an array of 2 elements? Can it be no array? Or can it be an array of 3 elements? 3) And is the rule that, the original operator (or method) * will then be invoked on element 0, with the argument of element 1? (element 0 and element 1 are the two elements in that array returned by coerce) Who does it? Is it done by Ruby or is it done by code in Fixnum? If it is done by code in Fixnum, then it is a "convention" that everybody follows when doing a coerce? So could it be the code in * of Fixnum do something like this: if (something.typeof? ...) else if ... # other type else if ... # other type else # if it is not a type I know array = something.coerce(self) return array[0].*(array[1]) end

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  • Ruby LESS gem equivalent in Python

    - by Sean M
    The Ruby LESS gem looks awesome - and I am working on a Python/Pylons web project where it would be highly useful. CSS is, as someone we're all familiar with recently wrote about, clunky in some important ways. So I'd like to make it easier on myself. Is there an existing Python module or library that provides parallel functionality?

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  • Ruby Large HTML emails getting error, limit to header size

    - by Joe Stein
    def mailTo(subject,msg,folks) begin Net::SMTP.start('localhost', 25) do |smtp| smtp.send_message "MIME-Version: 1.0\nContent-type: text/html\nSubject: #{subject}\n#{msg}\n#{DateTime.now}\n", '[email protected]', folks end rescue => e puts "Emailing Sending Error - #{e}" end end when the HTML is VERY large I get this exception Emailing Sending Error - 552 5.6.0 Headers too large (32768 max) how can i get a larger html above max to work with Net::SMTP in Ruby

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  • ruby parseexecel gem - array not implemented

    - by josh
    I am trying to work with two worksheets at the same time. So I have code require 'parseexcel' #Open the excel file passed in from the commandline workbook = Spreadsheet::ParseExcel.parse(ARGV[0]) workbook2 = Spreadsheet::ParseExcel.parse(ARGV[1]) #Get the first worksheet worksheet = workbook.worksheet(0) worksheet2 = workbook2.worksheet(0) However, when I run this code I get an error: array is not implemented This error goes away when I comment out line: workbook2 = Spreadsheet::ParseExcel.parse(ARGV[1]) Why is this happeneing? Way I am running script is: ruby -rubygems traverse.rb excel.xls so.xls

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  • Ruby's autoload not working in 1.8.7 or Ruby Enterprise?

    - by webren
    I've written a gem and within a file I am doing this to autoload my main gem logic: $:.push File.expand_path('lib', __FILE__) require "oa-casport/version" require 'omniauth/core' module OmniAuth module Strategies autoload :Casport, 'omniauth/strategies/casport' end end For Ruby versions 1.8.7 and ree, it prints out "no such file to load - omniauth/strategies/casport' But it doesn't print out this message on version 1.9.2. Is there something off with the location of calling autoload? The repo for the gem is located at https://github.com/stevenhaddox/oa-casport

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  • What quality, parser-generator options exist for ruby?

    - by cartoonfox
    What open source (preferably gem-based) parser-generator options do I have in Ruby? I've used (flex&bison)|(lex&yacc) from C in the past, and I'm comfortable with BNF-style specifications. I've heard of treetop, but it looks a bit alien and verbose compared to yacc... Purpose: I want to convert my text markup language to a BNF and generate the parsing code. I think it's a better strategy than my first-order solution: http://github.com/dafydd/semantictext/blob/master/lib/semantictext/rich_text_parser.rb

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  • Something like PPerl for Ruby?

    - by sal
    I've used PPerl for deamon like processes. This program turns ordinary perl scripts into long running daemons, making subsequent executions extremely fast. It forks several processes for each script, allowing many proceses to call the script at once. Does anyone know of something like this for ruby? Right now I am planing on using a wrapper around curl to call a REST WebService written in Sinatra running on JRuby. I'm hoping there is a simpler option.

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  • ruby number to human-readable string conversion

    - by yaya3
    I need to have a list with id's for each list item being #one, #two etc. Is this the most efficient way or am I missing an in built ruby function here? -num_array = ["one", "two", "three", "four", "five", "six", "seven"] -navigation[:primary_level].each_with_index do |primary_item, idx| %li{ :id => "#{num_array[idx]}"}

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