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  • How to calculate Least Signficant Byte in Ruby

    - by Seth Archer
    I'm sending a byte array to a piece of hardware. The first 7 bytes contain data and the 8th byte is a checksum. The 8th byte is the Least Significant Byte of the sum of the first 7 bytes. Examples that include the correct checksum. The last byte of each of these is the checksum 200-30-7-5-1-2-0-245 42-0-0-1-176-0-148-39 42-0-0-3-177-0-201-118 How do I calculate the checksum? Thanks, Seth

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  • Cucumber failed scenarios not providing details (Ubuntu)

    - by user361646
    When I run cucumber from my Ubuntu server I don't get details on why the scenario is failing. For example here is what I get: ..... cucumber features/messaging.feature:6 # Scenario: Joe can view his inbox cucumber features/messaging.feature:14 # Scenario: Joe can send a message cucumber features/messaging.feature:26 # Scenario: Joe can view a message in his inbox cucumber features/messaging.feature:35 # Scenario: Joe can reply to a message ..... Is there something I need to configure or pass to the cucumber command to see the details of the failed scenarios??

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  • phusion_passenger/plugin.r b:37:in `load': undefined method `dir' for nil:NilClass (NoMethodError)

    - by dohkoos
    gem install passenger # version 3.0.2 run the command 'passenger start' then I got the error: c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passenger/plugin.r b:37:in `load': undefined method `dir' for nil:NilClass (NoMethodError) from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/plugin.rb:34:in `each' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/plugin.rb:34:in `load' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/plugin.rb:72:in `initialize' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/standalone/start_command.rb:52:in `new' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/standalone/start_command.rb:52:in `initialize' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/standalone/main.rb:93:in `new' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/standalone/main.rb:93:in `run_command' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/standalone/main.rb:48:in `each_command' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/standalone/main.rb:43:in `each' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/standalone/main.rb:43:in `each_command' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/standalone/main.rb:91:in `run_command' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/standalone/main.rb:62:in `run!' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/lib/phusion_passe nger/standalone/main.rb:39:in `run!' from c:/Ruby187/lib/ruby/gems/1.8/gems/passenger-3.0.2/bin/passenger:32 from c:/Ruby187/bin/passenger:19:in `load' from c:/Ruby187/bin/passenger:19 Any ideas would be greatly appreciated.

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  • SSL cert install in Mongrel

    - by normalocity
    Running a RoR app. I've created a self-signed SSL cert for my test/dev environment, which consists of a single mongrel, and Mac OS X Leopard. Can I install the SSL cert in such a way that mongrel will use it, or do I have build a different server stack to handle SSL (e.g. Apache in front of a mongrel cluster), and install the cert inside of Apache? For my production server, I'll eventually build a server stack like this, so it's no big deal if I have to go that direction - it's just a question of now or later. Thanks!

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  • gem install permission problem

    - by qichunren
    qichunren@zhaobak:~ gem install hpricot ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions into the /opt/ruby-enterprise-1.8.7/lib/ruby/gems/1.8 directory. current ligin user is qichunren, and qichunre user have write permission with .gem dir.I would like to know why gem not install files into my home .gem dir first?????Why my gem common first want to install files into /opt/ruby-enterprise-1.8.7/lib/ruby/gems/1.8

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  • rspec testing a controller post changing my params from symbols to strings and breaking my tests

    - by ssmithstone
    In my controller spec I am doing this: it "should create new message" do Client.should_receive(:create).with({:title => 'Mr'}) post 'create' , :client => {:title => "Mr" } end ... and in my controller I am doing ... def create client = Client.create(params[:client]) end However this is failing with the following error message : expected: ({:title=>"Mr"}) got: ({"title"=>"Mr"}) I'm wondering why this is happening and how to get it to work

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  • RJS error: TypeError: element is null

    - by salilgaikwad
    Hi All, I got RJS error: TypeError: element is null while using ajax. I used in view <%= periodically_call_remote(:url={:action='get_user_list', :id='1'}, :frequency = '5') % in controller render :update do |page| page.replace_html 'chat_area', :partial => 'chat_area', :object = [@chats, @user] if @js_update end in partial chat_area <% if [email protected]? && !show_div(@chats).blank?% <% show_div_id=show_div(@chats) % <% for chat in @chats % " style="display:<%= (chat.id == show_div_id)? 'block' : 'none' %;" <% form_remote_for(:chat, :url => {:controller=>'chats', :action='create', :id=1}, :html={:name = "form_#{chat.id}"}, :complete="resetContent('#{chat.id}');") do |f| % <%= f.hidden_field :sessionNo, :value=chat.sessionNo % <%= f.text_area :chatContent, :id= "chatContent_field_#{chat.id}", :cols="100", :rows="6", :onKeyPress="return submitenter(this,event);" % ')"/ <% end % </div> <% end % <% else % <% end % My div present in index.html.erb <table border="0" width="100%" cellspacing="0" cellpadding="0"> <tbody><tr> <td align="left" width="80%" valign="top" style=""> <%= text_area :chat, :chatContent, :id=> "chatContent_field", :cols=>"100", :rows=>"6" %> </td> <td align="left" width="20%" valign="bottom" style="padding-left:10px;padding-left:10px;x" > <div id="chat_area"> <%= render :partial => 'chat_area' %> </div> </td> </tr> </tbody> </table> Any help is appreciated. Regards, Salil Gaikwad

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  • How to extent activrerecord,just make id to id.to_i

    - by qichunren
    module ActiveRecord module Mixin alias old_id id def id old_id.to_i end def hello "hellooooooooooooo" end end end ActiveRecord::Base.send :include, ActiveRecord::Mixin I make is because: id column in oracle is number type,not number(10), @user.id return 123.0,not 123,so I would like to do it by extend ar. But my way above does not work for me,it still show number with dot zero,123.0. How to make id auto invove id.to_i???

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  • using paperclip with secure and non-secure files

    - by crankharder
    First off, we have this namespaced/sti'd structure for our different types of 'Media' Media< Ar::Base Media::Local < Media Media::Local::Image < Media::Local Media::Local::Csv < Media::Local etc... etc.. This is excellent since a user can have many media, and how we display each piece of media is based on the class name and a co-responding partial. But what if we have some Csv's that need to be secure? That is, they can't reside inside of public. I really hate the idea of branching Media again and doing something like this: Media::Secure < Media Media::Secure::Image < Media::Secure Media::NotSecure < Media Media::NotSecure::Image < Media::NotSecure ...where Secure and NotSecure would have different params passed to has_attached_file. Now there are two classes that represent Image and it makes my view/helper system that much more complicated -- not to mention it feels very obtuse. What I would really like to do is be able to change where certain Paperclip::Attachment objects get saved before they get saved (e.g. anything uploaded through foo_secure_action) -- but I can't seem to make this work. Paperclip::Attachment has an @options hash with :path and :url, but changing those before it is saved doesn't have an effect on where it actually gets set. Even if this is possible, I'm not sure if it would have further consequences... I'm open to alternative ideas for structuring this data, but for the moment I like the idea of using STI for this situation.

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  • Ruby Summer of Code Project Ideas

    - by blatyo
    So, I'm thinking about applying for Ruby Summer of Code. However, I'm not sure what I want to propose. I was wondering if any of my fellow redditors had any good ideas? I've been programming in Ruby for about 3 years. I am primarily a web developer, but I do things related to bit torrent, data mining, and databases as well. I have a bit torrent related gem that I wrote for the hell of it. I've also got some projects on Github (username: blatyo). I am looking for ideas for me, but anything you can think of that would be awesome I would like to hear as well.

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  • Get paperclip to crop the image without validating

    - by Micke
    Hello fellow stackoverflow members. I have been following this guide to enable users to have their own avatar. But i have bumped in to a litle problem. When the user is cropping the image the model tries to validate all my validations. My user model looks like this: class User < ActiveRecord::Base has_attached_file :avatar, :styles => { :small => "100x100>", :large => "500x500>" }, :processors => [:cropper] attr_accessor :password, :crop_x, :crop_y, :crop_w, :crop_h attr_accessible :crop_x, :crop_y, :crop_w, :crop_h validates_confirmation_of :password validates_presence_of :password And when the user runs the crop updating script the user model tries to validate the password. But because i have no password field on the cropping page it can't validate it. Here is the updating of the crop: @user = User.find(current_user.id) if @user.update_attributes(params[:user]) flash[:notice] = "Successfully updated user." end How can i bypass this in a easy and clean way?

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  • How to force the method for a formtastic form to be put?

    - by J. Pablo Fernández
    I have something like semantic_form_for @whatever, :url => whatever_url which generates a from with method="post" I need it to be put, I've already tried: semantic_form_for @whatever, :url => whatever_url, :html => {:method => "put"} and semantic_form_for @whatever, :url => whatever_url, :html => {:method => :put} and semantic_form_for @whatever, :url => whatever_url, :html_args => {:method => :put} with no effect. Any ideas how it's done?

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  • Nested attributes in the index view?

    - by user283179
    How would I show one of many nested objects in the index view class Album < ActiveRecord::Base has_many: photos accepts_nested_attributes_for :photos, :reject_if => proc { |a| a.all? { |k, v| v.blank?} } has_one: cover accepts_nested_attributes_for :cover end class Album Controller < ApplicationController layout "mini" def index @albums = Album.find(:all, :include => [:cover,]).reverse respond_to do |format| format.html # index.html.erb format.xml { render :xml => @albums } end end This is what I have so fare. I just want to show a cover for each album. Any info on this would be a massive help!!

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  • Authlogic with nested attributes and polymorphic associations

    - by ferparra
    Hi all! I'm having trouble with the following code: User < AR acts_as_authentic belongs_to :owner, :polymorphic => true end Worker < AR has_one :user, :as => :owner accepts_nested_attributes_for :user end Employer < AR has_one :user, :as => :owner accepts_nested_attributes_for :user end I'd like to create registration forms based on user types, and to include authentication fields such as username and password. I currently do this: UserRegistrationController < AC #i.e. a new Employer def new @employer = Employer.new @employer.build_user end ... end I then include User fields with fields_for. All views render fine, but here's the catch: I cannot build a User, it tells me :password is a wrong method, so I guess the authentication logic was bypassed. What should I do? Am I doing it wrong altogether? Should I drop polymorphic associations in favor of Single Table Inheritance? Whatever I do, I have to make sure it plays nicely with Authlogic.

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  • No-Model Formtastic Form

    - by Kevin Sylvestre
    I am looking to reproduce the following with Formtastic: <% form_tag '/search', :method => 'get' do %> <%= text_field_tag :q, params[:q] %> <% end %> So far I have: <% semantic_form_for :search, :html => { :method => :get } do |form| %> <% form.inputs do %> <%= form.input :q %> <% end %> <% end %> However, this requires access to the parameter hash using: params[:search][:q] Instead of my required: params[:q] I'd like to use Formtastic for all forms in the application I am working on, and so far I have only had problems with this one. Any ideas?

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  • heroku time zone problem

    - by Ole Morten Amundsen
    Why does Time.now yield the server local time when I have set the another time zone in my environment.rb config.time_zone = 'Copenhagen' I've put this in a view <p> Time.zone <%= Time.zone %> </p> <p> Time.now <%= Time.now %> </p> <p> Time.now.utc <%= Time.now.utc %> </p> <p> Time.zone.now <%= Time.zone.now %> </p> <p> Time.zone.today <%= Time.zone.today %> </p> rendering this result on my app at heroku Time.zone (GMT+01:00) Copenhagen Time.now Mon Apr 26 08:28:21 -0700 2010 Time.now.utc Mon Apr 26 15:28:21 UTC 2010 Time.zone.now 2010-04-26 17:28:21 +0200 Time.zone.today 2010-04-26 Time.zone.now yields the correct result. Do I have to switch from Time.now to Time.zone.now, everywhere? Seems cumbersome. I truly don't care what the local time of the server is, it's giving me loads of trouble due to extensive use of Time.now. Am I misunderstanding anything fundamental here?

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  • Efficient counting of an association’s association

    - by Matthew Robertson
    In my app, when a User makes a Comment in a Post, Notifications are generated that marks that comment as unread. class Notification < ActiveRecord::Base belongs_to :user belongs_to :post belongs_to :comment class User < ActiveRecord::Base has_many :notifications class Post < ActiveRecord::Base has_many :notifications I’m making an index page that lists all the posts for a user and the notification count for each post for just that user. # posts controller @posts = Post.where( :user_id => current_user.id ) .includes(:notifications) # posts view @posts.each do |post| <%= post.notifications.count %> This doesn’t work because it counts notifications for all users. What’s an efficient way to do this without running a separate query for each post?

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  • How do I rollback capistrano tasks upon failure?

    - by dchua
    In my Capistrano deploy.rb, I have a couple of daemons like delayed_jobs and fetcher, starting and stopping depending on where they are in the deployment process. This method would create problems if a deployment fails, because the daemons wouldn't be managed properly (ie. two processes spawned instead of one, or processes were shutdown without restarting itself until the next deployment). Is there anyway to prevent this from happening like a rollback code? How is deployment of daemons normally done over capistrano?

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  • Creating a form for editing embedded documents with MongoMapper

    - by Luke Francl
    I'm playing around with MongoMapper but I'm having trouble figuring out how to create a form for an object that has embedded documents. With ActiveRecord, I'd use fields_for but when asked if this would be supported a few months ago, MongoMapper author John Nunemaker wrote: "Nope and nope. It is really [not] that hard with attr_accessor's." OK, fair enough, but how do you write the form for this to work? I'm not interested in using the nested form implementations that are out there because I want to do this the "normal" way as I'm learning about MongoMapper. My model is simple enough - I've got a Person with embedded documents for email addresses, phone numbers, etc. I do not care about updating existing embedded documents. They can be re-created from the form input each time a Person is edited.

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  • Paypal subscriptions IPN - problem with users subscribing multiple times

    - by Brian Armstrong
    I'm using paypal subscriptions and the instant payment notification (IPN) to handle subscribers on my site. For the most part it works well but there is one occasional problem I've encountered. Usually if a user cancels their subscription, I wait for the "end of term" (subscr_eot) notification before disabling access to my site. So if they prepay for the whole month, and then cancel right away, they still have access for the rest of the month (as it should be). But some users are having this problem where they: Cancel their subscription Before the "end of term" is reached they decide to re-subscribe When the "end of term" is reached for their first subscription, my app receives the notification and fires off an email to the user with something like "your account has been disabled, if you ever want to sign up again, you can re-subscribe by clicking here". This confuses them because they are thinking...that's weird, I thought I subscribed like a week ago (and they did). So they go subscribe AGAIN. Now they have two concurrent running subscriptions to my site and I get a support email in a month or two ("wtf you billed me twice this month jerk!!") So I haven't found a good way to fix this. I guess the best solution would be to do an additional API call when the "end of term" notification is received which asks paypal "hey did this person already re-subscribe?". If so then no need to fire off that email. But I haven't seen any way to do this API call yet. Another solution is to disable their account immediately when they cancel (the "subscr_cancel" notification) but then I get different angry support emails "hey I prepaid for the whole month why was my account disabled already!!". Anyone else solved this?

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