So why is this not working? I'm creating a regex that will match a formula (which is then part of a larger standard description). But I'm stuck here, as it doesn't appear to want to match embedded formulas within a formula. stat = /(Stat3|Stat2|Stat1)/ number_sym = /[0-9]*/ formula_sym = /((target's )?#{stat}|#{number_sym}|N#{n...
I running a rails project and I am displaying a textfield that can often be too long. If there any things I can call to only display 20 words or 120 characters on the the view page ?? ...
SOAP? Why would you use that? I am using Ruby Enterprise Edition and Rails 3 to write my web application. The application uses Ustream's Watershed white label broadcasting services to provide live streaming for my users. Unfortunately I have hit a snag during development. Watershed allows an application to provide it's own authentic...
Hello. This may be a stupid question but im just starting to learn Rail thats why i am asking thsi question. I have one model called "User" which handles all the users in my community. Now i want to add a guestbook to every user. So i created a model called "user_guestbook" and inserted this into the new model: belongs_to :user and t...
Is it possibe to skip a rule by validating it using ruby code in treetop? Say there is something like this: rule short_words [a-z]+ { def method1 text_value end ... } end And I want the words size to be from 2 to 5 letters. Can I exit rule if I find that the length of text_value is not between 2 and 5? ...
What's a better way to traverse an array while iterating through another array? For example, if I have two arrays like the following: names = [ "Rover", "Fido", "Lassie", "Calypso"] breeds = [ "Terrier", "Lhasa Apso", "Collie", "Bulldog"] Assuming the arrays correspond with one another - that is, Rover is a Terrier, Fido is a Lhasa Ap...
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 tok...
I have an ActiveRecord::Base class which needs to have one field's value picked as the lowest integer available considering the records already in the database. This snippet does that, does it seem efficient to you? Can it be improved? class Thing < ActiveRecord::Base def initialize special = 0 Thing.find(:all,:order=>"special...
My ruby file is like this. `mkdir #{HOST} -p` It works fine by: ruby mycode.rb But in a cron job 0 * * * * ruby ~/backup.rb >> backup.log It will a -p folder. Why? ...
While its not my application a simple way to explain my problem is to assume I'm running a URL shortener. Rather than attempt to try and figure out what the next string I should use as the unique section of the URL, I just index all my URLs by integer and map the numbers to strings behind the scenes, essentially just changing the base of...
I'm building a Sinatra based app for deployment on Heroku. You can imagine it like a standard URL shortener but where old shortcodes expire and become available for new URLs (I realise this is a silly concept but its easier to explain this way). I'm representing the shortcode in my database as an integer and redefining its reader to give...
I've recently started looking at Merb, for use with some small projects around the office. I'm trying to set up my first project following the docs, and am encountering an exception such as: foo:beta user$ merb Merb root at: /Users/user/code/merb/beta Loading init file from ./config/init.rb Loading ./config/environments/development.rb ...
Not sure the title fully describes the problem/question I'm trying to ask, sorry. One of my fellow developers has created classes as such: class Widget attr_accessor :model_type ... end and: class ModelType MODEL1 = "model1" MODEL2 = "model2" MODEL3 = "model3" end Now he wants me to convert a retrieved string "MODEL1" t...
I'm processing huge data files (millions of lines each). Before I start processing I'd like to get a count of the number of lines in the file, so I can then indicate how far along the processing is. I am using Ruby, and because of the size of the files, it would not be practical to read the entire file into memory just to count how many...
Hello, as a way to spice up my C++ programming homework, I've decided to instead of typing the C++ from the book onto my computer, instead reforming it in Ruby. Yes it's a bit silly, but I'm bored. Anyway, I'm having trouble converting this kind of function to Ruby void swap(int &a,int &b){ int c=b; b=a; a=c } What would be th...
I have created a simple blog application using Ruby on Rails, both of which I am new to. I am trying to get my most 'voted' posts to display in my /views/posts/index.html.erb view. Here are the basics. I have created a votes table and successfully allow a user to 'vote' for a post on the /views/posts/show.html.erb page. The VotesContro...
this is from the development log... /usr/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:101:in `dispatch_cgi' /usr/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:27:in `dispatch' /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/rails.rb:76:in `process' /usr/lib/ruby/g...
What are the best practices for reading and writing binary data in Ruby? In the code sample below I needed to send a binary file using over HTTP (as POST data): class SimpleHandler < Mongrel::HttpHandler def process(request, response) response.start(200) do |head,out| head["Content-Type"] = "application/ocsp-responder" ...
Wow, switching to REST is a different paradigm for sure and is mainly a headache right now. view <% form_tag (businesses_path, :method => "get") do %> <%= select_tag :business_category_id, options_for_select(@business_categories.collect {|bc| [bc.name, bc.id ]}.insert(0, ["All Containers", 0]), which_business_category(@business_ca...
I have some logic in before_save whereby (only) when some conditions are met I let the new row be created with special_number equal to the maximum special_number in the database + 1. (If the conditions aren't met then I do something different, so I can't use auto-increments) My worry is that two threads acting on this database at once m...