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  • How to parse an argument without a name with Ruby's optparse

    - by Leonid Shevtsov
    I need to parse a command line like script.rb <mandatory filename> [options] with optparse. Sure I can write some custom code to handle the filename, then pass ARGV to optparse, but maybe there's a simpler way to do it? EDIT: there's another hacky way to parse such a command line, and that is pass '--mandatory-filename ' + ARGV to optparse, then handle the --mandatory-filename option.

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  • ruby class collections

    - by poseid
    how does this work? in irb: >> class A >> b = [1, 2,3] >> end => [1, 2, 3] Is b an instance variable? class variable? how would I access b from outside the class? Is it used for meta-programming?

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  • about ruby range?

    - by why_
    like this range = (0..10) how can I get number like this: 0 5 10 plus five every time but less than 10 if range = (0..20) then i should get this: 0 5 10 15 20

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  • General question about Ruby singleton class

    - by Dex
    module MyModule def my_method; 'hello'; end end class MyClass class << self include MyModule end end MyClass.my_method # => "hello I'm unsure why "include MyModule" needs to be in the singleton class in order to be called using just MyClass. Why can't I go: X = MyClass.new X.my_method

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  • wp columns tag clouding with ruby on rails

    - by Arpit Vaishnav
    i am wrking on tag clouds with wp columns ( java script) but it s not wrking .It contains files like tagcloud.swf and swfobject.js . I have added this file in public folder and added html.erb file in the view but its not generating the code and showing any thing on the page the code is <%= javascript_include_tag 'swfobject.js' %> <style type="text/css"> body { background-color: #eee; padding: 20px; } </style> <% tags = (current_user.all_tags) % <% all_tags = tags.flatten.uniq% <script type="text/javascript"> var so = new SWFObject("/tagcloud.swf", "tagcloud", "600", "400", "7", "#ffffff"); // uncomment next line to enable transparency //so.addParam("wmode", "transparent"); so.addVariable("tcolor", "0x333333"); so.addVariable("mode", "tags"); so.addVariable("distr", "true"); so.addVariable("tspeed", "100"); so.addVariable("tagcloud", "<tags> <% for t in all_tags %> <a href='#' style='22' color='0xff0000' hicolor='0x00cc00'><%=t.to_s%></a> <%#= link_to t.to_s ,tag_index_path(t) %> <% end %></tags>"); so.write("flashcontent"); </script></body>

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  • arguments into instance methods in ruby

    - by aharon
    So, I'd like to be able to make a call x = MyClass.new('good morning', 'good afternoon', 'good evening', 'good night', ['hello', 'goodbye']) that would add methods to the class whose values are the values of the arguments. So now: p x.methods #> [m_greeting, a_greeting, e_greeting, n_greeting, r_greeting, ...] And p x.m_greeting #> "good morning" p x.r_greeting #> ['hello', 'goodbye'] I realize that this is sort of what instance variables are to do (and that if I wanted them immutable I could make them frozen constants) but, for reasons beyond my control, I need to make methods instead. Thanks!

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  • Ruby on Rails: attr_accessor for submodels

    - by williamjones
    I'm working with some models where a lot of a given model's key attributes are actually stored in a submodel. Example: class WikiArticle has_many :revisions has_one :current_revision, :class_name => "Revision", :order => "created_at DESC" end class Revision has_one :wiki_article end The Revision class has a ton of database fields, and the WikiArticle has very few. However, I often have to access a Revision's fields from the context of a WikiArticle. The most important case of this is probably on creating an article. I've been doing that with lots of methods that look like this, one for each field: def description if @description @description elsif current_revision current_revision.description else "" end end def description=(string) @description = string end And then on my save, I save @description into a new revision. This whole thing reminds me a lot of attr_accessor, only it doesn't seem like I can get attr_accessor to do what I need. How can I define an attr_submodel_accessor such that I could just give field names and have it automatically create all those methods the way attr_accessor does?

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  • Ruby -- looking for some sort of "Regexp unescape" method

    - by RubyNoobie
    I have a bunch of strings that appear to have been double-escaped -- eg, I have "\\014\"\\000\"\\016smoothing\"\\011mean\"\\022color\"\\011zero@\\016" but I want "\014"\000"\016smoothing"\011mean"\022color"\011zero@\016" Is there a method I can use to unescape them? I imagine that I could make a regex to remove 1 backslash from every consecutive n backslashes, but I don't have a lot of regex experience and it seems there ought to be a "more elegant" way to do it. For example, when I puts MyString it displays the output I'd like, but I don't know how I might capture that into a variable. Thanks! Edited to add context: I have this class that is being used to marshal / restore some stuff, but when I restore some old strings it spits out a type error which I've determined is because they weren't -- for some inexplicable reason -- stored as base64. They instead appear to be 'double-escaped', when I need them to be 'single-escaped' to get restored. require 'base64' class MarshaledStuff < ActiveRecord::Base validates_presence_of :marshaled_obj def contents obj = self.marshaled_obj return Marshal.restore(Base64.decode64(obj)) end def contents=(newcontents) self.marshaled_obj = Base64.encode64(Marshal.dump(newcontents)) end end

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  • Ruby: Having trouble pulling data from this class

    - by Shpigford
    So here's the output of inspect on a class: <Recurly::BillingInfo::CreditCard:0x1036a8a98 @prefix_options={}, @attributes={"month"=>1, "last_four"=>"1", "type"=>"bogus", "year"=>2010}> I'm trying to get the type attribute but seems that might be some sort of reserved word? Here's the full rundown of what I'm trying to do @charges = Recurly::BillingInfo.find('123') @charges.credit_card.type So, how can I get type from that?

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  • Use hash or case-statement [Ruby]

    - by user94154
    Generally which is better to use?: case n when 'foo' result = 'bar' when 'peanut butter' result = 'jelly' when 'stack' result = 'overflow' return result or map = {'foo' => 'bar', 'peanut butter' => 'jelly', 'stack' => 'overflow'} return map[n] More specifically, when should I use case-statements and when should I simply use a hash?

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  • error while using cancan in ruby: "uninitialized constant CanCan::Rule::Mongoid"

    - by Ran
    here is my controller: class AdminController < ApplicationController before_filter :require_user authorize_resource :class => false def index end def users_list end end here is my Ability class: class Ability include CanCan::Ability def initialize(user) if user.admin? can :manage, :all else can :read, :all end end end when trying to access "/admin/users_list" (with an admin user or without) i get the following error: uninitialized constant CanCan::Rule::Mongoid any thoughts?

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  • How do I switch Ruby-on-Rails into en-UK

    - by Nick Clarke
    Hi, I'm trying to switch one of my websites into en-UK so that I get the correct date and currency formats etc... I have found this yaml file: http://github.com/mattetti/globalite/blob/master/lang/rails/en-UK.yml Any ideas if there is a better one to use? I also checked here but could not see it: http://github.com/svenfuchs/rails-i18n/tree/master/rails/locale Thanks, Nick

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  • Ruby: "do this task eventually"

    - by marienbad
    I hope this question is clear enough -- if not let me know :) What API would I use when I want to write a procedure at runtime and then just run it eventually at low priority while continuing to do the important stuff right now? Example: link checker 1. I write a blog post with links represented by Link objects. I publish the post. 2. Eventually (at very low priority) the system gets around to fetching the URL of each Link object to make sure it's not broken and indicates that in a property of the Link object. 3. When a user visits my blog post, the render code that turns Link objects into HTML knows whether the links have been checked. I'm assuming there's a very general purpose API for doing this kind of "eventually/low priority" stuff.

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  • vim: How do I line up ruby options?

    - by TheDeeno
    With vim how do I to turn this: t.string :crypted_password :null => false t.string :password_salt, :null => false into this: t.string :crypted_password, :null => false t.string :password_salt, :null => false without manually adding the spaces to each line?

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  • frequency of objects in an array using Ruby

    - by eastafri
    If i had a list of balls each of which has a color property. how can i cleanly get the list of balls with the most frequent color. [m1,m2,m3,m4] say, m1.color = blue m2.color = blue m3.color = red m4.color = blue [m1,m2,m4] is the list of balls with the most frequent color My Approach is to do: [m1,m2,m3,m4].group_by{|ball| ball.color}.each do |samecolor| my_items = samecolor.count end where count is defined as class Array def count k =Hash.new(0) self.each{|x|k[x]+=1} k end end my_items will be a hash of frequencies foreach same color group. My implementation could be buggy and i feel there must be a better and more smarter way. any ideas please?

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  • Checking for nil in view in Ruby on Rails

    - by seaneshbaugh
    I've been working with Rails for a while now and one thing I find myself constantly doing is checking to see if some attribute or object is nil in my view code before I display it. I'm starting to wonder if this is always the best idea. My rationale so far has been that since my application(s) rely on user input unexpected things can occur. If I've learned one thing from programming in general it's that users inputting things the programmer didn't think of is one of the biggest sources of run-time errors. By checking for nil values I'm hoping to sidestep that and have my views gracefully handle the problem. The thing is though I typically for various reasons have similar nil or invalid value checks in either my model or controller code. I wouldn't call it code duplication in the strictest sense, but it just doesn't seem very DRY. If I've already checked for nil objects in my controller is it okay if my view just assumes the object truly isn't nil? For attributes that can be nil that are displayed it makes sense to me to check every time, but for the objects themselves I'm not sure what is the best practice. Here's a simplified, but typical example of what I'm talking about: controller code def show @item = Item.find_by_id(params[:id]) @folders = Folder.find(:all, :order => 'display_order') if @item == nil or @item.folder == nil redirect_to(root_url) and return end end view code <% if @item != nil %> display the item's attributes here <% if @item.folder != nil %> <%= link_to @item.folder.name, folder_path(@item.folder) %> <% end %> <% else %> Oops! Looks like something went horribly wrong! <% end %> Is this a good idea or is it just silly?

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  • Better way to fill a Ruby hash?

    - by sardaukar
    Is there a better way to do this? (it looks clunky) form_params = {} form_params['tid'] = tid form_params['qid'] = qid form_params['pri'] = pri form_params['sec'] = sec form_params['to_u'] = to_u form_params['to_d'] = to_d form_params['from'] = from form_params['wl'] = wl

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  • Ruby on Rails - f.error_messages not showing up

    - by Brian Roisentul
    Hi, I've read many posts about this issue but I never got this to work. My model looks like this: class Announcement < ActiveRecord::Base validates_presence_of :title, :description end My controller's create method(only its relevant part) looks like this: def create respond_to do |format| if @announcement.save flash[:notice] = 'Announcement was successfully created.' format.html { redirect_to(@announcement) } format.xml { render :xml => @announcement, :status => :created, :location => @announcement } else @announcement = Announcement.new @provinces = Province.all @types = AnnouncementType.all @categories = Tag.find_by_sql 'select * from tags where parent_id=0 order by name asc' @subcategories= '' format.html { render :action => "new" } #new_announcement_path format.xml { render :xml => @announcement.errors, :status => :unprocessable_entity } end end end My form looks like this: <% form_for(@announcement) do |f| %> <%= error_messages_for 'announcement' %> <!--I've also treid f.error_messages--> ... What am I doing wrong?

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  • Executing Password Change over Ruby Net-SSH

    - by tesmar
    Hi all, I am looking to execute a password change over Net-ssh and this code seems to hang: Net::SSH.start(server_ip, "user", :verbose => :debug ) do |session| session.process.popen3("ls") do |input, output, error| ["old_pass","test", "test"].each do |x| input.puts x end end end I know the connection works because using a simple exec I can get the output from ls on the remote server, but this hangs. Any ideas? The last message from debug is that the public key succeeded.

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