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• Using audio plugins in a rewire slave application

  - by Nik Reiman

  I would like to be able to use VST/AudioUnit effects from a rewire slave such as Ableton Live, but it seems that Live doesn't let you use plugins when running in this mode. I'm not exactly sure why that is, but it would be nice to get working so that I could use VST plugins from within GarageBand without having to use the VST2AU wrapper plugin. What sequencers let you use VST plugins when running as a rewire slave?

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• flashplugin installer works for firefox but not chromium-browser

  - by user829755

  I'm on Ubuntu precise (12.04.5 LTS) and I do have flashplugin-installer installed. When I click on flash videos in chromium-browser I get "An error occurred, please try again later". In firefox they display fine. I opened chrome://plugins to see if the flash plugin is installed and indeed it's not listed. Also http://www.codegeek.net/flash-version.php displays: "You do not have Flash player installed", while with firefox it says: You have Flash player 11.2.202 installed. Following some instructions on some ubuntu page I copied the plugin using sudo cp /usr/lib/flashplugin-installer/libflashplayer.so /usr/lib/chromium-browser/plugins/ and I started chromium using chromium-browser --enable-plugins but this didn't help. chrome://chrome/ says: Version 36.0.1985.125 Ubuntu 12.04 (283153). what else can I try?

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• Ruby on Rails deployment, on "thin" server with lot of attachments

  - by Horace Ho

  A lot of PDFs are stored inside MySQL as a BLOB field for each PDF file. The average file size is 500K each. The Rails app will stream the :binary data as file downloads, where there is a user click on the download link. Assume there is a maximum of 5 users downloading 5 PDFs concurrently, what kind of deployment setup parameters I should be aware of? e.g. for the case of thin: thin start --servers 3 whether --servers 3 is good enough (or 5 or more is needed) for the above example? The 2nd question is whether 'thin' a capable solution? Thanks!

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• How to retrieve all the records from a Berkeley DB in Ruby

  - by Federico Builes

  I'd like to be able to get all the key-values stored in a Berkeley DB using the Ruby bindings from http://github.com/mattbauer/bdb/tree/master but I'm not sure how to proceed. Any pointers will be appreciated. UPDATE Here's a small script that loops over the keys and prints them. Based on Pax' answer: require 'rubygems' require 'bdb' env = Bdb::Env.new(0) env.open('foo', Bdb::DB_CREATE,0) db = env.db db.open(nil, 'db1.db', nil, Bdb::Db::BTREE, Bdb::DB_CREATE,0) db.put(nil, 'key', 'value', 0) db.put(nil, 'key1', 'value1', 0) db.put(nil, 'key2', 'value2', 0) dbc = db.cursor(nil,0) key,val = dbc.get(nil,nil,Bdb::DB_FIRST) while key p key,val key,val = dbc.get(nil,nil,Bdb::DB_NEXT) end dbc.close db.close(0) env.close

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• Convert non-breaking spaces to spaces in Ruby

  - by CoolAJ86

  I have cases where user-entered data from an html textarea or input is sometimes sent with \u00a0 (non-breaking spaces) instead of spaces when encoded as utf-8 json. I believe that to be a bug in Firefox, as I know that the user isn't intentionally putting in non-breaking spaces instead of spaces. There are also two bugs in Ruby, one of which can be used to combat the other. For whatever reason \s doesn't match \u00a0 However [^[:print:]] (which definitely should not match) and \xC2\xA0 both will match, but I consider those to be less-than-ideal ways to deal with the issue. Are there other recommendations for getting around this issue?

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• Ruby on Rails: having two xmlbuilder templates per action , one for errors one for regular output

  - by randombits

  What's the best way to handle having two templates (or should it be one, DRY?) for xml builder templates? I'm building a web api with Rails and wanted to see an example of how to have a view that does regular output vs one that does error output. I've been using @obj.to_xml for a while, but my requirements have changed and require me building my own error templates. do you typically have both views in one with a condition above for errors such as app/views/myresource/create.xml.builder unless @myobj.errors.empty? // xml for errors here? end // regular xml view

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• Desktop Application Development with Javascript, Python / Ruby

  - by Chris

  Hello, Besides using Appcelerator's Titanium Desktop, are there other approaches to integrating Javascript and Ruby/Python into cross-platform desktop applications? Just trying to get a sense of the landscape here. From searching the web, it seems Titanium may be leading the charge in terms of this type of integration. I wasn't able to find references that suggest you can do something similar in Adobe AIR. I am interested in building desktop applications that exploit Protovis and possibly other Javascript interactive vis packages for the UI. At the end of the day, I can go the web app route if need be, but being able to develop desktop apps is helpful. Would appreciate your perspective on this... Chris

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• Change present working directory of a calling shell from a ruby script

  - by Erik Kastman

  I'm writing a simple ruby sandbox command-line utility to copy and unzip directories from a remote filesystem to a local scratch directory in order to unzip them and let users edit the files. I'm using Dir.mktmpdir as the default scratch directory, which gives a really ugly path (for example: /var/folders/zz/zzzivhrRnAmviuee+++1vE+++yo/-Tmp-/d20100311-70034-abz5zj) I'd like the last action of the copy-and-unzip script to cd the calling shell into the new scratch directory so people can access it easily, but I can't figure out how to change the PWD of the calling shell. One possibility is to have the utility print out the new path to stdout and then run the script as part of a subshell (i.e. cd $(sandbox my_dir) ), but I want to print out progress on the copy-and-unzipping since it can take up to 10 minutes, so this won't work. Should I just have it go to a pre-determined, easy-to-find scratch directory? Does anyone have a better suggestion? Thanks in advance for your help. -Erik

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• web development with ruby without rails?

  - by kmorris511

  For reasons beyond my control, I'm being tasked with Ruby web development that does NOT use Rails or really any other heavyweight framework such as Merb. I'm wondering if anybody else has encountered this and can recommend best practices or resources that describe best practices for such a problem. I'd like to avoid the dreaded out.print('<td class="foo">'+some_data+'</td>') style of web development. A coworker has suggested Rack as a light framework but the documentation is sketchy and it seems unproven in the market.

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• Ruby 1.9, gmail and NET::SMTP

  - by anshul

  I am running ruby 1.9.1p243 (2009-07-16 revision 24175) [x86_64-linux]. require 'mail' options = { :address => "smtp.gmail.com", :port => 587, :domain => 'REMOVED', :user_name => 'REMOVED', :password => 'REMOVED', :authentication => 'plain', :enable_starttls_auto => true } Mail.defaults do delivery_method :smtp, options end Mail.deliver do to 'REMOVED' from 'REMOVED' subject 'Testing' body 'Test body' end results in the error Net::SMTPAuthenticationError: 530 5.7.0 Must issue a STARTTLS command first. x.REMOVED! What am I doing wrong and how do I fix it?

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• Accessing ruby counter cache

  - by Julian

  Hi all, I'm playing around with a fork of acts_as_taggable_on_steroids as a learning exercise. The version I'm looking at does some stuff I don't understand to calculate Tag counts. So I thought I'd do a version using PORC (Plain Old Rails Counters): class Tagging < ActiveRecord::Base #:nodoc: belongs_to :tag, :counter_cache => "tagging_counter_cache" ... I thought tagging_counter_cache was transparently accessed when I access tag.taggings.count but apparently not? Do I really have to access tag.tagging_counter_cache explicitly? >> tag.taggings.count SQL (0.7ms) SELECT count(*) AS count_all FROM `taggings` WHERE (`taggings`.tag_id = 16) Same for size. It's cool if that's the case but just wanted to check.

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• Twitter Oauth Strategy with Warden + Devise Authentication Gems for Ruby

  - by Michael Waxman

  Devise, the authentication gem for Ruby based on Warden (another auth gem) does not support Twitter Oauth as an authentication strategy, BUT Warden does. There is a way to use the Warden Twitter Oauth strategy within Devise, but I cannot figure it out. I'm using the following block in the devise config file: config.warden do |manager| manager.oauth(:twitter) do |twitter| twitter.consumer_secret = <SECRET> twitter.consumer_key = <KEY> twitter.options :site => 'http://twitter.com' end manager.default_strategies.unshift :twitter_oauth end But I keep on getting all sorts of error messages. Does anyone know how to make this work? I'm assuming there is more to do here (configuring a new link/route to talk to Warden, maybe adding attributes to the Devise User model, etc.), but I can't figure out what they are. Please help.

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• ruby / rails / mysql performance degraded on Snow Leopard

  - by adamaig

  I've burned a bunch of hours on this. I'm not having problems getting things to build, but I am seeing that my test suite runs about 2x slower than when I was on OS X 10.5.x . I've spent a lot of time playing around with different optimization settings (learning to avoid homebrew's llvm-gcc compilation). I've just learned that I needed to tweaks /Library/Preferences/SystemConfiguration/com.apple.Boot.plist in order to get the kernel to boot in 64 bit mode. However, my rails app is still running a bit slower than before, even after warming up the mysql server. So what performance tweaks might i need to look into? Right now the stock ruby 1.8.7 runs faster than 1.9.1 for some things, and I'd really like to know if there is anything I should be looking for. All my dev software has been compiled for x86_64, mysql with -O2 optimization, using regular gcc (not llvm-gcc).

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• Ruby Programming Techniques: simple yet not so simple object manipulation

  - by Shyam

  Hi, I want to create an object, let's say a Pie. class Pie def initialize(name, flavor) @name = name @flavor = flavor end end But a Pie can be divided in 8 pieces, a half or just a whole Pie. For the sake of argument, I would like to know how I could give each Pie object a price per 1/8, 1/4 or per whole. I could do this by doing: class Pie def initialize(name, flavor, price_all, price_half, price_piece) @name = name @flavor = flavor @price_all = price_all @price_half = price_half @price_piece = price_piece end end But now, if I would create fifteen Pie objects, and I would take out randomly some pieces somewhere by using a method such as getPieceOfPie(pie_name) How would I be able to generate the value of all the available pies that are whole and the remaining pieces? Eventually using a method such as: myCurrentInventoryHas(pie_name) # output: 2 whole strawberry pies and 7 pieces. I know, I am a Ruby nuby. Thank you for your answers, comments and help!

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• ruby xmpfilter on windows

  - by dreftymac

  Has anyone out there ever gotten xmpfilter to work on windows? xmpfilter "unterminated string meets end of file" is the error. The only Google hit is in Japanese: google://xmpfilter "unterminated string meets end of file" http://www.unkar.org/read/pc12.2ch.net/tech/1249687283 For background, the desired feature from xmpfilter is to get automatic "eval" annotations of Ruby sourcecode: Before: a = "bravo alpha charlie" # => b = a.split # => b.sort! # => After: a = "bravo alpha charlie" # => "bravo alpha charlie" b = a.split # => ["bravo", "alpha", "charlie"] b.sort! # => ["alpha", "bravo", "charlie"]

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• Ruby on Rails Mysterious Javascript Alert box with cookie information

  - by conorgil

  I have a problem in a Ruby on Rails app that I am working on. I have been working on the app for months and I have never had this problem before and after a bit of Google searches I think that somehow someone is trying to steal cookies with javascript. When I click on the link I get an alert box titled "the page at www.napkinboard.com says:" and contains the following message: __utmz=217223433.1270652009.59.3.utmcsr=localhost:3000|utmccn=(referral)|utmcmd=referral|utmcct=/; __utma=217223433.2133018314.1265749085.1271097412.1271125626.63; __utmc=217223433; __utmb=217223433.11.10.1271125626 I checked the database and all data associated with this 'food_item' looks completely normal and does not contain any javascript at all. How did this suddenly happen and how can I stop it? I appreciate any help. Thanks.

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• Packing a long binary integer in Ruby

  - by user1056142

  I'm trying to send a very long binary integer over UDP (on the order of 200 bits). When I try to use Array's pack method, it complains the string I'm trying to convert is too large. Am I going about this the wrong way? ruby-1.8.7-p352 :003 > [0b1101001010101101111010100101010011010101010110010101010101010010010101001010101010101011101010101010101111010101010101010101].pack('i') RangeError: bignum too big to convert into `unsigned long' from (irb):3:in `pack' from (irb):3 This number is supposed to represent a DNS query packet (this is for a homework assignment; we're not allowed to use any DNS libraries).

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• json parse error in ruby - unexpected token at

  - by RahTha

  Hi, I get errors at a lot of places when trying to retrieve ticker symbols for US companies from http://d.yimg.com/autoc.finance.yahoo.com/autoc?callback=YAHOO.Finance.SymbolSuggest.ssCallback&query=Wal-Mart I have tried to: resp = Net::HTTP.get_response(URI.parse(url)) data = resp.body qwe = data.split("symbol") p qwe[1] arr1 = data.split("(") arr2 = arr1[1].split(")") fnl = arr2[0].gsub(/-/, '') fnl = fnl.gsub(/\(/, '') fnl = fnl.gsub(/\)/, '') fnl = fnl.gsub(/\./, '') fnl = fnl.gsub('\'', '"') fnl = fnl.gsub(/([\{|\,}])\s*([a-zA-Z]+):/, '\1 "\2":') But this doesnt help as i see: /Library/Ruby/Gems/1.8/gems/json-1.2.0/lib/json/common.rb:123:in `parse': 353: unexpected token at '{"symbol":"BEEV","name": "BENCHMARK ENERGY CORP ' (JSON::ParserError) Any clues as to what i might be doing wrong?

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• Configurable ruby logger setup: Logger.new().level = variable

  - by Daniel

  Hi, I want to change the logging level of an application (ruby). require 'logger' config = { :level => 'Logger::WARN' } log = Logger.new STDOUT log.level = Kernel.const_get config[:level] Well, the irb wasn't happy with that and threw "NameError: wrong constant name Logger::WARN" in my face. Ugh! I was insulted. I could do this in a case/when to solve this, or do log.level = 1, but there must be a more elegant way! Does anyone have any ideas? -daniel

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• Ruby types of collections in ActiveRecord

  - by kmorris511

  If I have an object with a collection of child objects in ActiveRecord, i.e. class Foo < ActiveRecord::Base has_many :bars, ... end and I attempt to run Array's find method against that collection: foo_instance.bars.find { ... } I receive: ActiveRecord::RecordNotFound: Couldn't find Bar without an ID I assume this is because ActiveRecord has hijacked the find method for its own purposes. Now, I can use detect and everything is fine. However to satisfy my own curiousity, I attempted to use metaprogramming to explicitly steal the find method back for one run: unbound_method = [].method('find').unbind unbound_method.bind(foo_instance.bars).call { ... } and I receive this error: TypeError: bind argument must be an instance of Array so clearly Ruby doesn't think foo_instance.bars is an Array and yet: foo_instance.bars.instance_of?(Array) -> true Can anybody help me with an explanation of this and of a way to get around it with metaprogramming?

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• multiplayer / visitors interactions with Ruby on Rails?

  - by Jordi

  I want to have interactions between visitors on my site. Imagine a chat room. It basically involves getting the data from everyone and sending it to everyone, this can be done by ajax and what not but I wonder if there is something already there in the wild that would do the heavy lifting for me. I have to say that I got very lost once I start programming Ajax, dont even know how to make tests for it... I have found the Q42multiplayer library that looks like what I want but they use C# as backend. There is something similar or any other multiplayer thingy I can get some idea or rip some code from (the whole thing will be opensource) for Ruby on Rails?

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• ruby on rails, searchlogic and refactoring

  - by JohnMerlino

  Hey all, I'mt not too familiar with searchlogic plugin for rails (I did view the railscasts but wasn't helpful in relation to the specific code below). Can anyone briefly describe how it is being used in the three methods below? Thanks for any response. def extract_order @order_by = if params[:order].present? field = params[:order].gsub(".", "_") field = field.starts_with?('-') ? 'descend_by_'+field[1..-1] : 'ascend_by_'+field field.to_sym else # Workaround 'searchlogic'.to_sym end end def find_resources @search_conditions = params[:search_conditions] || {} # See http://www.binarylogic.com/2008/11/30/searchlogic-1-5-7-complex-searching-no-longer-a-problem/ @resources = @resource_model.send(@order_by).searchlogic(:conditions => @search_conditions) end def apply_filters f = filter_by f.each do |filter_field| filter_constraints = params[filter_field.to_sym] if filter_constraints.present? # Apply searchlogic's scope @resources.send(filter_field,filter_constraints) end end end

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• Parsing SOAP response using libxml in Ruby

  - by abhishektiwari

  I am trying to parse following SOAP response coming from Savon SOAP api <?xml version='1.0' encoding='UTF-8'?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"> <soapenv:Body> <ns:getConnectionResponse xmlns:ns="http://webservice.jchem.chemaxon"> <ns:return> &lt;ConnectionHandlerId>connectionHandlerID-283854719&lt;/ConnectionHandlerId> </ns:return> </ns:getConnectionResponse> </soapenv:Body> </soapenv:Envelope> I am trying to use libxml-ruby without any success. Basically I want to extract anything inside tag and the connectionHandlerID value.

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• Ruby Strange Error

  - by Ell

  Whenever I require a file in ruby or irb I get this error: LoadError: no such file to load -- (insert any filename).rb from <internal:lib/rubygems/custom_require>:29:in `require' from <internal:lib/rubygems/custom_require>:29:in `require' from (irb):1 from /usr/bin/irb1.9.1:12:in `<main>' It happens even if the file exists I am using ruby1.9.1 and to my knowledge, I have not installed rubygems. I am running on Ubuntu 10.10 Maverick Meerkat. Please help, this problem is very annoying! Thanks in advance, ell. EDIT: I forgot to say that no matter where the file is, even if its in the same directory and definately exists I always get this error.

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• mutidimensional array from javascript/jquery to ruby/sinatra

  - by user199368

  Hi, how do I pass a 2-dimensional array from javascript to ruby, please? I have this on client side: function send_data() { var testdata = { "1": { "name": "client_1", "note": "bigboy" }, "2": { "name": "client_2", "note": "smallboy" } } console.log(testdata); $.ajax({ type: 'POST', url: 'test', dataType: 'json', data: testdata }); } and this on server side: post '/test' do p params end but I can't get it right. The best I could get on server side is something like {"1"=>"[object Object]", "2"=>"[object Object]"} I tried to add JSON.stringify on client side and JSON.parse on server side, but the first resulted in {"{\"1\":{\"name\":\"client_1\",\"note\":\"bigboy\"},\"2\":{\"name\":\"client_2\",\"note\":\"smallboy\"}}"=>nil} while the latter has thrown a TypeError - can't convert Hash into String. Could anyone help, or maybe post a short snippet of correct code, please? Thank you

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