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• How would I detect horizontal-black lines using ImageMagick?

  - by Zando

  So I have what is essentially a spreadsheet in TIFF format. There is some uniformity to it...for example, all the column widths are the same. I want to de-limit this sheet by those known-column widths and basically create lots of little graphic files, one for each cell, and run OCR on them and store it into a database. The problem is that the horizontal lines are not all the same height, so I need to use some kind of graphics library command to check if every pixel across is the same color (i.e. black). And if so, then I know I've reached the height-delimiter for a cell. How would I go about doing that? (I'm using RMagick)

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• Mongomapper - unit testing with shoulda on rails 2.3.5

  - by egarcia

  I'm trying to implement shoulda unit tests on a rails 2.3.5 app using mongomapper. So far I've: Configured a rails app that uses mongomapper (the app works) Added shoulda to my gems, and installed it with rake gems:install Added config.frameworks -= [ :active_record, :active_resource ] to config/environment.rb so ActiveRecord isn't used. My models look like this: class Account include MongoMapper::Document key :name, String, :required => true key :description, String key :company_id, ObjectId key :_type, String belongs_to :company many :operations end My test for that model is this one: class AccountTest < Test::Unit::TestCase should_belong_to :company should_have_many :operations should_validate_presence_of :name end It fails on the first should_belong_to: ./test/unit/account_test.rb:3: undefined method `should_belong_to' for AccountTest:Class (NoMethodError) Any ideas why this doesn't work? Should I try something different from shoulda? I must point out that this is the first time I try to use shoulda, and I'm pretty new to testing itself.

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• What if I have an API method and a contoller/view method with the same name in RoR?

  - by Chad Johnson

  Suppose I want to be able to view a list of products on my site by going to /product/list. Great. So this uses my 'list' view and outputs some HTML which my web browser will render. But now suppose I want to provide a REST API to my client where they can get a list of their products. So I suppose I'd have them authenticate with oAuth and then they'd call /product/list which would return a JSON array of their products. But like I said earlier, /product/list displays an HTML web page. So, I have a conflict. What is normal practice as far as providing APIs in Rails? Should I have a subdirectory, 'api', in /app/controller, and another 'product' controller? So my client would go to /api/product/list to get a list of their products? I'm a bit new to RoR, so I don't have the best grasp of the REST functionality yet, but hopefully my question makes sense.

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• Is Cancan's accessible_by my best choice for altering admin scope on the fly?

  - by evanchurchill

  Situation: On my site, I have a comment model, with a deleted field. Users cannot see deleted comments, but I would like to allow admins to see deleted comments, if they choose to. This will be accomplished by having a scope for users with the admin role which allows them to view comments with the deleted field set to false, as well as true. Question: Is Cancan's accessible_by method my best choice for doing so? From what I've read, it sounds like it will facilitate exactly what I'm trying to do, but, I don't want to implement something that is inefficient, if there is a better method.

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• lost session after redirect_to

  - by PeterWong

  I encountered a strange performance in my current project, which is about session. The strange part is it was normal in Safari but failed in other browsers (includes chrome, firefox and opera). There is a registration form for input of part of the key information (email, password, etc) and is submitted to an action called "create" This is the basic code of create action: @account = Account.new(params[:account]) if @account.save ApplicationController.current_account = @account session[:current_account] = ApplicationController.current_account session[:account] = ApplicationController.current_account.id email = @account.email Mailer.deliver_account_confirmation(email) flash[:type] = "success" flash[:notice] = "Successfully Created Account" redirect_to :controller => "accounts", :action => "create_step_2" else flash[:type] = "error" flash[:title] = "Oops, something wasn't right." flash[:notice] = "Mistakes are marked below in red. Please fix them and resubmit the form. Thanks." render :action => "new" end Also I created a before_filter in the application controller, which has the following code: ApplicationController.current_account = Account.find_by_id(session[:current_account].id) unless session[:current_account].blank? For Safari, there is no any problem. But for the other browsers, the session[:current_account] does not exist and so produced the following error message: RuntimeError in AccountsController#create_step_2 Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id Please could anyone help me?

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• Sinatra Title Slugs

  - by Ethan Turkeltaub

  I'm trying to create a slug helper in Sinatra. Here's the code (as seen here): helpers do def sluggify(title) accents = { ['á','à','â','ä','ã'] => 'a', ['Ã','Ä','Â','À'] => 'A', ['é','è','ê','ë'] => 'e', ['Ë','É','È','Ê'] => 'E', ['í','ì','î','ï'] => 'i', ['Î','Ì'] => 'I', ['ó','ò','ô','ö','õ'] => 'o', ['Õ','Ö','Ô','Ò','Ó'] => 'O', ['ú','ù','û','ü'] => 'u', ['Ú','Û','Ù','Ü'] => 'U', ['ç'] => 'c', ['Ç'] => 'C', ['ñ'] => 'n', ['Ñ'] => 'N' } accents.each do |ac,rep| ac.each do |s| title = title.gsub(s, rep) end end title = title.gsub(/[^a-zA-Z0-9 ]/,"") title = title.gsub(/[ ]+/," ") title = title.gsub(/ /,"-") title = title.downcase end end I keep getting this error: private method `gsub' called for nil:NilClass What exactly is going wrong?

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• How do I make a grouped select box grouped by a column for a given model in Formtastic for Rails?

  - by jklina

  In my Rails project I'm using Formtastic to manage my forms. I have a model, Tags, with a column, "group". The group column is just a simple hardcoded way to organize my tags. I will post my Tag model class so you can see how it's organized class Tag < ActiveRecord::Base class Group BRAND = 1 SEASON = 2 OCCASION = 3 CONDITION = 4 SUBCATEGORY = 5 end has_many :taggings, :dependent => :destroy has_many :plaggs, :through => :taggings has_many :monitorings, :as => :monitorizable validates_presence_of :name, :group validates_uniqueness_of :name, :case_sensitive => false def self.brands(options = {}) self.all({ :conditions => { :group => Group::BRAND } }.merge(options)) end def self.seasons(options = {}) self.all({ :conditions => { :group => Group::SEASON } }.merge(options)) end def self.occasions(options = {}) self.all({ :conditions => { :group => Group::OCCASION } }.merge(options)) end def self.conditions(options = {}) self.all({ :conditions => { :group => Group::CONDITION } }.merge(options)) end def self.subcategories(options = {}) self.all({ :conditions => { :group => Group::SUBCATEGORY } }.merge(options)) end def self.non_brands(options = {}) self.all({ :conditions => [ "`group` != ? AND `group` != ?", Tag::Group::SUBCATEGORY, Tag::Group::BRAND] }.merge(options)) end end My goal is to use Formtastic to provide a grouped multiselect box, grouped by the column, "group" with the tags that are returned from the non_brands method. I have tried the following: = f.input :tags, :required => false, :as => :select, :input_html => { :multiple => true }, :collection => tags, :selected => sel_tags, :group_by => :group, :prompt => false But I receive the following error: (undefined method `klass' for nil:NilClass) Any ideas where I'm going wrong? Thanks for looking :]

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• AuthLogic - how to determine current user id throughout the system?

  - by sscirrus

  Hi all, I have set up AuthLogic almost exactly as per the AuthLogic example app at http://github.com/binarylogic/authlogic_example. After someone logs in as User, they can click on links that send them away into the system and away from the users controller. This is an incredibly noob question, but how can I access that User's ID and other attributes from anywhere else, such as an unrelated view or unrelated controller? An example of what I'd like to do: #matchings controller @matching = Matching.find_by_user_id(user.id)

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• Error message: uninitialized constant Rails::Initializer::MemCache

  - by tomeara

  I've installed just about every library/gem that I could find for memcached/memcache, but everytime I attempt to run my application I get this error: Error message: uninitialized constant Rails::Initializer::MemCache Exception class: NameError I have tried $ telnet localhost 11211 and memcached is definitely running. Any ideas? (I'm running Apache2/Passenger)

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• Prevent Rails link_to_remote multiple submits w Javascript

  - by Chris

  In a Rails project I need to keep a link_to_remote from getting double-clicked. It looks like :before and :after are my only choices - they get prepended/appended to the onclick Ajax call, respectively. But if I try something like: :before => "self.stopObserving()" t,he Ajax is never run. If I try it for :after the Ajax is run but the link never stops observing. The solutions I've seen rely on creating a variable and blocking the whole form, but there are multiple link_to_remote rows on this page and it is valid to click more than one of them at a time - just not the same one twice. One variable per row declared outside of link_to_remote seems very kludgey... Instead of using Prototype I originally tried plain Javascript first for this proof of concept - but it fails too: <a href="#" onclick="self.onclick = function(){alert('foo');};"click</a just puts up an alert when clicked - the lambda here does nothing? This next one is more like the desired goal and should only alert the first time. But instead it alerts every time: <a href="#" onclick="alert('bar'); self.onclick = function(){return false;};"click</a All ideas appreciated!

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• Is there a way to create a step chart using the Google Charts API?

  - by Nathan

  I'd like to use the google charts API to create a step chart for my Rails application. Preferably using the annotated timeline Google has (since it has a nice wrapper plugin for rails): http://code.google.com/apis/visualization/documentation/gallery/annotatedtimeline.html However, there doesn't seem to be a way to create a step chart using the annotated timeline or any other chart in the Google API. I'm looking to make a plot like this: If there is no way to do this with the google API, is there an alternative graphing library that can handle such a task?

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• Cron Job to Schedule Rails Website Going Live?

  - by Daniel Upton

  Hello, World.. I'm currently building a website for an awesome youth church we run (shameless plug!).. Anywho at the moment we have a static countdown page http://mybase.co , and were having a massive launch this weekend and the site needs to go live when we launch, it's a rails app.. How would you recommend scheduling it going live? having a cron job and an apache a2en? or is there a better way? Thanks Daniel

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• Rack throwing an error when trying to serve a static file.

  - by Cameron

  use Rack::Static, :urls => ['/stylesheets', '/images'], :root => 'public' run proc { |env| [200, { 'Content-Type' => 'text/html', 'Cache-Control' => 'public, max-age=86400' }, File.open('public/index.html')] } I get private method `open' called for Rack::File:Class when I rackup. Really can't see where the problem is. Running rack 1.1. Help please...

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• Rails: Extracting the raw url from the request

  - by pankajbhageria

  I am working with Rails 2.2. The required behaviour is as follows: I have a link(with a ajax link embedded) xyz.com/admin#page1 When I go to the above page, I should be redirected to the login page, if I am not logged in. After I log in, I should be taken back to xyz.com/admin#page1 For this I need to store the url in session when I visit any page. The problem is that when I do request.uri, I get xyz.com/admin But I want to store xyz.com/admin#page1 Regards, Pankaj

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• Multiple Rails versions for multiple projects

  - by mathee

  I'd like to use Rails 2.2.2 for one project and Rails 2.3.2 for another. Both are installed. What is rails _2.2.2_ --version supposed to do? I've read that it makes 2.2.2 the working version -- that is, the version that will be used from that point on. But when I check rails --version, I get Rails 2.3.2. So, I also want to know what rails --version tells me; is it just the latest version of Rails that I have or is it the version that will be used for rakes? I know about RVM. Is that the best way to use different versions of Rails on different projects?

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• mongodb read/write performance and mongo hosting in the cloud

  - by z3cko

  we are currently developing a high traffic rails application with facebooker (facebook game). since amazon simpledb (aws-sdb) is really slow, we are thinking of using a dedicated mongodb server as offered by mongoHQ for example. questions: what is the read/writes peak value for a mongodb server running on a amazon ec2 instance? what would be a recommended setup for a ec2 hosted app with mongodb - a master on amazon EBS and replicas on the ec2 instances? any examples or experiences? is there a company that offers mongodb hosting in the cloud? thanks, mz

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• BigDecimal to_s does not match to_f

  - by Chris Bisignani

  Is the BigDecimal class broken? It seems like the following should never, ever occur: Note that a.to_f != a.to_s.to_f a.class = BigDecimal a.to_f = 18658.1072928 a.to_s = "10865.81072928" b.class = BigDecimal b.to_f = 10000.0 b.to_s = "10000.0" (a - b).to_f = 865.81072928 a.to_f - b.to_f = 8658.1072928 Any ideas as to what might be going wrong?

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• File permissions changed between OS X and Windows

  - by Horace Ho

  I zipped a rails project from OS X and sent it to a colleague who works on Windows. He updated the source, zipped the whole project folder and sent the zip file back to me. After unzipping the project, I found that the file permissions information is kind of lost. For example, the script/server is changed from -rwxr-xr-x to -rw-r--r--. Is there a way to preserver the file permission flags, when transferring files between mac and windows? Thanks

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• How to build an easy Rails authentication with OpenID and OAuth1.0a-2.0?

  - by Andrei

  Hi, I'am looking for an easy authentication for my users mostly via facebook, but keeping OpenID and other OAuth alternatives as well. For the case if something will go very bad, I will ask my users to optionally provide their email address, which should be obtained via OpenID or OAuth if possible. The same thing is about their name. I am a newbie in Rails, so I started with Railscasts.com #160 (authlogic) and #170 (authlogic and OpenID), however, I had some problems trying to sign in with my Google Account. As I understand, it will take some effort to adjust #170 for my objectives. On the other hand, there is gem authlogic_rpx which will possibly provide me the needed functionality (see http://rails-authlogic-rpx-sample.heroku.com/signin). What would you do? Is it reasonable to put one more step (RPX) in the authentication logic?

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• Rails3 renders a js.erb template with a text/html content-type instead of text/javascript

  - by Yannis

  Hi, I'm building a new app with 3.0.0.beta3. I simply try to render a js.erb template to an Ajax request for the following action (in publications_controller.rb): def get_pubmed_data entry = Bio::PubMed.query(params[:pmid])# searches PubMed and get entry @publication = Bio::MEDLINE.new(entry) # creates Bio::MEDLINE object from entry text flash[:warning] = "No publication found."if @publication.title.blank? and @publication.authors.blank? and @publication.journal.blank? respond_to do |format| format.js end end Currently, my get_pubmed_data.js.erb template is simply alert('<%= @publication.title %>') The server is responding with the following alert('Evidence for a herpes simplex virus-specific factor controlling the transcription of deoxypyrimidine kinase.') which is perfectly fine except that nothing happen in the browser, probably because the content-type of the response is 'text/html' instead of 'text/javascript' as shown by the response header partially reproduced here: Status 200 Keep-Alive timeout=5, max=100 Connection Keep-Alive Transfer-Encoding chunked Content-Type text/html; charset=utf-8 Is this a bug or am I missing something? Thanks for your help!

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• Automating rake doc:app

  - by jerhinesmith

  For you rails programmers, what's the easiest way to keep your RDoc files up-to-date? I know I can run rake doc:app manually, but I really don't feel like adding a manual step to the check-in process, and since we're already using cruisecontrolrb to handle deployment and testing automation, it seems like there should be an easy way to regenerate these files on check-in. Is anyone already automating rake doc:app? And, if so, what are your suggestions?

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• How do I model teams and gameplay in this scorekeeping application?

  - by Eric Hill

  I'm writing a scorekeeping application for card game that has a few possibly-interesting constraints. The application accepts user registrations for players, then lets them check-in to a particular game (modeled as Event). After the final player registers, the app should generate teams, singles or doubles, depending on the preference of the person running the game and some validations (can't do doubles if there's an odd number checked in). There are @event.teams.count rounds in the game. To sum up: An event consists of `@event.teams.count` rounds; Teams can have 1 or more players Events have n or n/2 teams (depending on whether it's singles or doubles) Users will be members of different teams at different events Currently I have a rat's nest of associations: class User < ActiveRecord::Base has_many :teams, :through => :players has_many :events, :through => :teams class Event < ActiveRecord::Base has_many :rounds has_many :teams has_many :players, :through => :teams class Player < ActiveRecord::Base belongs_to :user belongs_to :team end class Team < ActiveRecord::Base has_many :players belongs_to :event end class Round < ActiveRecord::Base belongs_to :event belongs_to :user end The sticky part is team generation. I have basically a "start game" button that should freeze the registrations and pair up teams either singly or doubly, and render to Round#new so that the first (and subsequent) matches can be scored. Currently I'm implementing this as a check on Round#new that calls Event#generate_teams and displays the view: # Event#generate_teams def generate_teams # User has_many :events, :through => :registrations # self.doubles is a boolean denoting 2 players per team registrations.in_groups_of(self.doubles ? 2 : 1, nil).each do |side| self.teams << Player.create(self,side) end end Which doesn't work. Should there maybe be a Game model that ties everything together rather than (my current method) defining the game as an abstraction via the relationships between Events, Users, and Rounds (and Teams and Players and etc.)? My head is swimming.

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• accepts_nested_attributes with Model.update for multiple models

  - by Ohad

  Hi, I'm trying to follow http://railscasts.com/episodes/198-edit-multiple-individually but I would like to save objects which are nested (accepts_nested_attributes_for). I've added the following in my controller: def edit_multiple @people = Person.find(params[:person_ids], :include => [:parameters]) end def update_multiple keys = params[:people].keys if keys.empty? flash[:error] = "Please select at least one person" redirect_to :back and return end values = keys.map {|k| params[:people][k]} @people = Person.update(keys,values).reject { |h| h.errors.empty? } if @people.empty? flash[:notice] = 'Updated people!' redirect_to person_path else redirect_to edit_multiple_path end end and in the view: <% form_tag update_multiple_people_path, :method => :post do %> <% for person in @people %> <% fields_for "people[]", host do |f| %> <%= f.error_messages :object_name => "person" %> <h3><%= h person.name %></h3> <% for parameter in person.parameters %> <% f.fields_for "person_parameters[]", parameter do |builder| -%> <%= render "common/parameters", :f => builder %> <% end -%> <% end -%> <p><%= link_to_add_fields "Add a parameter", f, :person_parameters, "common/parameters" %></p> <% end %> <% end %> <p><%= submit_tag "Edit these Parameter(s)" %></p> <% end %> but I'm always getting a mistmatch - e.g. ActiveRecord::AssociationTypeMismatch and Parameter(#70341811965140) expected, got Array(#70341874300460) Thanks!

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• Unable to find a tab completion for Rubygem in Bash/Zsh

  - by Masi

  I have not found a tab-completion script for RubyGem in Bash/Zsh. Where can you get the tab-completion script for RubyGem in Bahs/Zsh?

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• Solution for social network + marketplace with multiple sellers?

  - by user261231

  I want to build a social network, with some of the users being able to put up some stuff up for sale. So basically, a social network + multiple sellers e-commerce. What is the best technology solution for that? I was thinking of going Rails route, using CommunityEngine and ActiveMerchant. Another option is going PHP and using something like X-Cart, which already has multiple sellers interface. Any recommendations? Thanks!

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