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  • Surgical slave reads for Ruby on Rails, mulitple databases.

    - by Daniel
    Greetings, I'm currently working on a multiple database rails application. I want to off load the SELECT queries on to the slave databases for only SOME of the databases or specific models. The issue is that in places, we swap out the current database connection and put in a different one for a short time; to load fixtures or to handle sharding. Does anyone have any recommendations on a ruby gem that 1. will split select/(sql writes) with a considerable amount of control. We want to handle just some models and we are looking for a neat surgical fix. 2. does not monkey around with activerecord. 3. is still being maintained. TIA -daniel

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  • In Ruby, can the coerce() method know what operator it is that requires the help to coerce?

    - by Jian Lin
    In Ruby, it seems that a lot of coerce() help can be done by def coerce(something) [self, something] end that's is, when 3 + rational is needed, Fixnum 3 doesn't know how to handle adding a Rational, so it asks Rational#coerce for help by calling rational.coerce(3), and this coerce instance method will tell the caller: # I know how to handle rational + something, so I will return you the following: [self, something] # so that now you can invoke + on me, and I will deal with Fixnum to get an answer So what if most operators can use this method, but not when it is (a - b) != (b - a) situation? Can coerce() know which operator it is, and just handle those special cases, while just using the simple [self, something] to handle all the other cases where (a op b) == (b op a) ? (op is the operator).

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  • Why ruby object has two to_s and inspect methods that (looks like) do the same thing?

    - 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? And what's the difference between puts/print/p? If I comment out the to_s or inspect function, I get as follows. #<Graph:0x100124b88>#<Graph:0x100124b88>

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  • how do I get the IP of incoming ICMP due to UDP-send to dead client in Ruby?

    - by banister
    so.. I'm doing a small multiplayer game with blocking UDP and IO.select. To my problem.. (In the server) reading from a UDP socket (packet, sender = @socket.recvfrom(1000)) which have just sent a packet to a dead client results in a ICMP unreachable (and exception Errno::ECONNRESET in ruby). The problem is that I can't find any way whatsoever to extract the IP of that ICMP.. so I can clean out that dead client. Anyone know how to achieve this? thanks

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  • virtual column for drop down in the ruby on rails.

    - by pramod
    How to place a drop down for the virtual column, in the ruby on rails. The virutal column does not exist in my table , but I want to get the value from the drop down ,when user saves the data. for example, product_price is a virtual column , which doesn't exist in my database table. But I would like to have a dropdown, with product price to be displayed from another table. And when user selects the product_price, the selected product_price should be gettable in an object as self.product_price. Virtual column for labels is working fine, but for drop down its not working for me..any info woud be Thankful...

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  • Does Ruby on Rails "has_many" array provide data on a "need to know" basis?

    - by Jian Lin
    On Ruby on Rails, say, if the Actor model object is Tom Hanks, and the "has_many" fans is 20,000 Fan objects, then actor.fans gives an Array with 20,000 elements. Probably, the elements are not pre-populated with values? Otherwise, getting each Actor object from the DB can be extremely time consuming. So it is on a "need to know" basis? So does it pull data when I access actor.fans[500], and pull data when I access actor.fans[0]? If it jumps from each record to record, then it won't be able to optimize performance by doing sequential read, which can be faster on the hard disk because those records could be in the nearby sector / platter layer -- for example, if the program touches 2 random elements, then it will be faster just to read those 2 records, but what if it touches all elements in random order, then it may be faster just to read all records in a sequential way, and then process the random elements. But how will RoR know whether I am doing only a few random elements or all elements in random?

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  • How Can I switch the session storage according to the client on Ruby on Rails 2.3.5

    - by mojalin
    Hi! I have a question about sessions on ruby-on-rails. We have a several options about session storage such as cookie, active_record_store, etc.. I primarily use the cookie storage, but, there are some client which doesn't support cookie function. In that case, I have to make that client to use the "active_record_store". My rails version is 2.3.5. I found out that even though I use the active_record_store, the cookie is still available. In my situation, both session storage might be available. So, I want to make the framework to primarily use the cookie, when the cookie is available. On the other hand, the client doesn't support the cookie, secondly to use the active_record_store. I think this function requires some override to the framework, but I don't know how to do it. Do you have any idea for that? Thank you very much in advance.

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  • Best Ruby ORM for Wrapping around Legacy SQL Server Database?

    - by Technocrat
    Hi. I found this answer and it sounds like almost exactly what I'm doing. I have heard mixed answers about whether or not datamapper can support SQL Server through dataobjects. Basically, we have an app that uses a consistently structured database, consistently named tables, etc in SQL Server. We're making all kinds of tools and stuff that have to interact with it, some of them remotely and so I decided that we need to create some common, simple access point to do read/write operations on the SQL Server app since it's API is all C# and other things I despise. Now my question is if anyone has any examples or projects they know of where a ruby ORM can essentially create models for another application's legacy database by defining the conventions of each model's pkeys, fkeys, table names, etc. Sequel is the only ORM I've used with SQL Server but never to do anything quite like this. Any suggestions?

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  • What does a Java static method look like in Ruby?

    - by Hosh
    In Java, a 'static method' would look like this: class MyUtils { . . . public static double mean(int[] p) { int sum = 0; // sum of all the elements for (int i=0; i<p.length; i++) { sum += p[i]; } return ((double)sum) / p.length; } . . . } // Called from outside the MyUtils class. double meanAttendance = MyUtils.mean(attendance); What's the equivalent 'Ruby way' of writing a 'static method'?

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  • What's a better choice for SQL-backed number crunching - Ruby 1.9, Python 2, Python 3, or PHP 5.3?

    - by Ivan
    Crterias of 'better': fast im math and simple (little of fields, many records) db transactions, convenient to develop/read/extend, flexible, connectible. The task is to use a common web development scripting language to process and calculate long time series and multidimensional surfaces (mostly selectint/inserting sets of floats and dong maths with rhem). The choice is Ruby 1.9, Python 2, Python 3, PHP 5.3, Perl 5.12, JavaScript (node.js). All the data is to be stored in a relational database (due to its heavily multidimensional nature), all the communication with outer world is to be done by means of web services.

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  • Ruby on Rails: What are Erubis' disadvantages and why isn't it packaged with Rails by default? How t

    - by williamjones
    I just discovered Erubis, a replacement for the default view renderer for Ruby on Rails. However, from what I can tell from reading about it, it's superior across the board. It is much faster. It has many more options. It can prevent cross site scripting without having to use h. Does this have any disadvantages versus the standard erb renderer? Why isn't this the standard renderer packaged with Rails? Also, the docs for Erubis say to install it just by installing the gem, and then add the following to environment.rb: require 'erubis/helpers/rails_helper' #Erubis::Helpers::RailsHelper.engine_class = Erubis::Eruby # or Erubis::FastEruby Reading the docs, FastEruby seems to be just a faster renderer than Eruby. Why wouldn't it be default and used by everyone? I'm highly interested in using the engine erubis::EscapedEruby which automatically calls h to escape html on fields from the database. Are there any gotchas I should be aware of or does this pretty much solve all cross site scripting?

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  • Programmatically Download Image to Desktop from Remote App with Ruby?

    - by viatropos
    I was thinking about making a little crop/resize batch processor online, and wanted to know if there was a way for me to do the following: upload image and specify dimensions click "process" and app resizes image image downloads automatically to wherever it was I uploaded it (say from my desktop), but with a new name (based on the time for example). This would make it so I could host a free image processor that never stored any data other than tempfiles. Is that possible? Something like Rails' send_file method, but I'm using Sinatra and am looking for something in pure ruby.

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  • In MongoDB, how can I replicate this simple query using map/reduce in ruby?

    - by Matthew Rathbone
    Hi, So using the regular MongoDB library in Ruby I have the following query to find average filesize across a set of 5001 documents: avg = 0 total = collection.count() Rails.logger.info "#{total} asset creation stats in the system" collection.find().each {|row| avg += (row["filesize"] * (1/total.to_f)) if row["filesize"]} Its pretty simple, so I'm trying to do the same using map/reduce as a learning exercise. This is what I came up with: map = 'function(){emit("filesizes", {size: this.filesize, num: 1});}' reduce = 'function(k, vals){ var result = {size: 0, num: 0}; for(var x in vals) { var new_total = result.num + vals[x].num; result.num = new_total result.size = result.size + (vals[x].size * (vals[x].num / new_total)); } return result; }' @results = collection.map_reduce(map, reduce) However the two queries come back with two different results! What am I doing wrong?

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  • Hide/Show Text Field based on Selected value - ROR

    - by Tau
    I am new to ROR. I am trying to show a "Others" text field only if the selected value is "others". I am trying to make hide/show function to be as general as possible, since I will need it in many controller. If anyone can help enlightening me, I will really appreciate it. BTW, I am using Rails 2.1.1 ruby 1.8.7 general_info.html.erb <div> <%= f.label :location_id, "Location:" %> <%= f.collection_select(:location_id, Event.locations, :id, :name, {:prompt => true}, {:onchange => remote_function( :url => {:action => "showHideDOMOther"}, :with => "'selectedText='+this.options[this.selectedIndex].text + '&other_div='+'loc_other'")}) %> </div> <div id="loc_other" style="display:none"> <%= f.label :location_others, "Others:" %> <%= f.text_field :location_others %> </div> info_controller.rb def showHideDomOther render :update do |page| page.showHideDOM("Others", params[:selectedText], params[:other_div]) end end ... application_helper.rb def showHideDOM(targetString, selectedText, targetDiv) if selectedText.casecmp targetString page.hide targetDiv else page.show targetDiv end end Seem to get the correct parameters value, but nothing seems to happen. This is what I see from the console when I changed the value of selection to "Others". Parameters: {"action"=>"showHideDOMOther", "authenticity_token"=>"e7da7ce4631480b482e29da9c0fde4c026a7a70d", "other_div"=>"loc_other", "controller"=>"events", "selectedText"=>"Others"} NoMethodError (undefined method search_generic_view_paths?' for #<EventsController:0xa41c720>): /vendor/plugins/active_scaffold/lib/extensions/generic_view_paths.rb:40:infind_template_extension_from_handler' C:/usr/lib/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_view/template_finder.rb:138:in pick_template_extension' C:/usr/lib/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_view/template_finder.rb:115:infile_exists?' : Rendering C:/usr/lib/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/templates/rescues/layout.erb (internal_server_error)

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  • How do Ruby and Python implement their interactive consoles?

    - by sxa
    When implementing the interpreter for my programming language I first thought of a simple console window which allows the user to enter some code which is then executed as a standalone program as a shell. But there are severe problems: If every line of code the user enters is handled as a standalone program, it has to go through the tokenizer and parser and is then just executed by the interpreter - what about functions then? How can the Python/Ruby interactive consoles (IDLE, irb) "share" the code? How is the code entered handled? Example: >> def x: >> print("Blah") >> >> x() Where is the function stored so it can be called at any time again? How can the interactive console take everything entered as obviously one program without executing everything over and over again?

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  • Ruby implementation of conversion between Latitude/Longitude and OS National Grid Reference point?

    - by Harry Wood
    For converting between Latitude/Longitude and UK's Ordnance Survey National Grid eastings and northings, this seems to be the most popular explanation and reference implementation in JavaScript: http://www.movable-type.co.uk/scripts/latlong-gridref.html The web is littered with other implementations in different languages. Making the conversion via PostGIS queries is another alternative. ...but did anyone implement this maths in ruby? OSGridToLatLong is the direction I'm looking for just at this moment, but I would have thought a library for converting in both directions must surely be available in a gem somewhere. I'm just not searching for the right thing.

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  • Why is it supposedly "hard" to deploy Ruby on Rails to production?

    - by johnny
    I admit that I don't follow much of anything "right" on deploying test versus production code. I have been using ASP.NET, and I typically run it locally in Visual Studio, it works, I upload it, I test it again on the production server. I have read several people say that deploying Rails apps is harder and there are special programs/ways on the ruby site about deploying RoR. I've only toyed with RoR. What is special about deployment? You don't just copy and paste the code and run it (from development machine to the production)? Is it because one is in Apache and the other running on the built in server? This will be on a Mac Server if it matters. Thank you for comments.

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  • How can I deploy a Perl/Python/Ruby script without installing an interpreter?

    - by Brian G
    I want to write a piece of software which is essentially a regex data scrubber. I am going to take a contact list in CSV and remove all non-word characters and such from the person's name. This project has Perl written all over it but my client base is largely non-technical and installing Perl on Windows would not be worth it for them. Any ideas on how I can use a Perl/Python/Ruby type language without all the headaches of getting the interpreter on their computer? Thought about web for a second but it would not work for business reasons.

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  • [Ruby] How can I randomly iterate through a large Range?

    - by void
    I would like to randomly iterate through a range. Each value will be visited only once and all values will eventually be visited. For example: (0..9).sort_by{rand}.map{|x| f(x)} where f(x) is some function that operates on each value. A Fisher-Yates shuffle could be used to increase efficiency, but this code is sufficient for many purposes. My problem is that sort_by will transform the range into an array, which is not cool because I am working with astronomically large numbers. Ruby will quickly consume a large amount of RAM trying to create a monstrous array. This is also why the following code will not work: tried = {} # store previous attempts bigint = 99**99 bigint.times { x = rand(bigint) redo if tried[x] tried[x] = true f(x) # some function } This code is very naive and quickly runs out of memory as tried obtains more entries. What sort of algorithm can accomplish what I am trying to do?

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  • How do you save a Neural Network to file using Ruby's ai4r gem?

    - by Jaime Bellmyer
    I'm using ruby's ai4r gem, building a neural network. Version 1.1 of the gem allowed me to simply do a Marshal.dump(network) to a file, and I could load the network back up whenever I wanted. With version 1.9 a couple years later, I'm no longer able to do this. It generates this error when I try: no marshal_dump is defined for class Proc I know the reason for the error - Marshal can't handle procs in an object. Fair enough. So is there something built in to ai4r? I've been searching with no luck. I can't imagine any practical use for a neural network you have to rebuild from scratch every time you want to use it.

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  • Why, in Ruby, does Array("foo\nbar") == ["foo\n", "bar"]?

    - by Tyson
    In Ruby 1.8.7, Array("hello\nhello") gives you ["hello\n", "hello"]. This does two things that I don't expect: It splits the string on newlines. I'd expect it simply to give me an array with the string I pass in as its single element without modifying the data I pass in. Even if you accept that it's reasonable to split a string when passing it to Array, why does it retain the newline character when "foo\nbar".split does not? Additionally: >> Array.[] "foo\nbar" => ["foo\nbar"] >> Array.[] *"foo\nbar" => ["foo\n", "bar"]

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  • Given an instance of a Ruby object, how do I get its metaclass?

    - by Stanislaus Wernstrom
    Normally, I might get the metaclass for a particular instance of a Ruby object with something like this: class C def metaclass class << self; self; end end end # This is this instance's metaclass. C.new.metaclass => #<Class:#<C:0x01234567>> # Successive invocations will have different metaclasses, # since they're different instances. C.new.metaclass => #<Class:#<C:0x01233...>> C.new.metaclass => #<Class:#<C:0x01232...>> C.new.metaclass => #<Class:#<C:0x01231...>> Let's say I just want to know the metaclass of an arbitrary object instance obj of an arbitrary class, and I don't want to define a metaclass (or similar) method on the class of obj. Is there a way to do that?

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  • Force Response to Download File(s) to Desktop with Ruby?

    - by viatropos
    I was thinking about making a little crop/resize batch processor online, and wanted to know if there was a way for me to do the following: upload image and specify dimensions click "process" and remote app resizes image image downloads automatically locally to wherever it was I uploaded it (say from my desktop), but with a new name (based on the time for example). This would make it so I could host a free image processor that never stored any data other than tempfiles. Is that possible? Something like Rails' send_file method, but I'm using Sinatra and am looking for something in pure ruby. What's the basic concept behind this? What if I wanted to do this for multiple files? Åssuming I can get multiple files uploaded no problem, how can I download all of them automatically?

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  • Best Ruby ORM for Wrapping around Legacy MSSQL Database?

    - by Technocrat
    Hi. I found this answer and it sounds like almost exactly what I'm doing. I have heard mixed answers about whether or not datamapper can support mssql through dataobjects. Basically, we have an app that uses a consistently structured database, consistently named tables, etc in MSSQL. We're making all kinds of tools and stuff that have to interact with it, some of them remotely and so I decided that we need to create some common, simple access point to do read/write operations on the MSSQL app since it's API is all C# and other things I despise. Now my question is if anyone has any examples or projects they know of where a ruby ORM can essentially create models for another application's legacy database by defining the conventions of each model's pkeys, fkeys, table names, etc. Sequel is the only ORM I've used with MSSQL but never to do anything quite like this. Any suggestions?

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  • What's the preferred way to use helper methods in Ruby?

    - by DR
    Disclaimer: Although I'm asking in context of a Rails application, I'm not talking about Rails helpers (i.e. view helpers) Let's say I have a helper method/function: def dispatch_job(job = {}) #Do something end Now I want to use this from several places (mostly controllers, but also a few BackgrounDRb workers) What's the preferred way to do this? I can think of two possibilities: 1. Use a class and make the helper a static method: class MyHelper def self.dispatch_job(job = {}) end end class MyWorker def run MyHelper.dispatch_job(...) end end 2. Use a module and include the method into whatever class I need this functionality module MyHelper def self.dispatch_job(job = {}) end end class MyWorker include MyHelper def run dispatch_job(...) end end 3. Other possibilities I don't know yet ... The first one is more Java-like, but I'm not sure if the second one is really an appropriate use of Ruby's modules.

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