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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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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' %>  ... What am I doing wrong?

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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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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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Where are my ruby gems?

- by scrrr

Hello, Linux newbie question I guess.. How can I find out where gem installs the gems on my Ubuntu 10 system? I want to read gem sourcecode and perhaps change things up a bit.

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Ruby on Rails - Currency : commas causing an issue.

- by easement

Looking on SO, I see that the preferred way to currency using RoR is using decimal(8,2) and to output them using number_to_currency(); I can get my numbers out of the DB, but I'm having issues on getting them in. Inside my update action I have the following line: if @non_labor_expense.update_attributes(params[:non_labor_expense]) puts YAML::dump(params) The dump of params shows the correct value. xx,yyy.zz , but what gets stored in the DB is only xx.00 What do I need to do in order to take into account that there may be commas and a user may not enter .zz (the cents). Some regex and for comma? how would you handle the decimal if it were .2 versus .20 . There has to be a builtin or at least a better way. My Migration (I don't know if this helps): class ChangeExpenseToDec < ActiveRecord::Migration def self.up change_column :non_labor_expenses, :amount, :decimal, :precision => 8, :scale => 2 end def self.down change_column :non_labor_expenses, :amount, :integer end end

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ruby on rails adding new route

- by ohana

i have an RoR application Log, which similar to the book store app, my logs_controller has all default action: index, show, update, create, delete.. now i need to add new action :toCSV, i defined it in logs_controller, and add new route in the config/routes as: map.resources :logs, :collection = { :toCSV = :get }. from irb, i checked the routes and see the new routes added already: rs = ActionController::Routing::Routes puts rs.routes GET /logs/toCSV(.:format)? {:controller="logs", :action="toCSV"} then ran ‘rake routes’ command in shell, it returned: toCSV_logs GET /logs/toCSV(.:format) {:controller="logs", :action="toCSV"} everything seems working. finally in my views code, i added the following: link_to 'Export to CSV', toCSV_logs_path when access it in the brower 'http://localhost:3000/logs/toCSV', it complained: Couldn't find Log with ID=toCSV i checked in script/server, and saw this one: ActiveRecord::RecordNotFound (Couldn't find Log with ID=toCSV): app/controllers/logs_controller.rb:290:in `show' seems when i click that link, it direct it to the action 'show' instead of 'toCSV', thus it took 'toCSV' as an id...anyone know why would this happen? and to fix it? Thanks...

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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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Ruby, post and redirect

- by Adrian Serafin

Hi! I have situation like this: user submits form with action='/pay' in '/pay' I have to add some additional parameters and send post request to www.paymentprovider.com/new_payment The problem is that I want to post and redirect (at the same time) user to this new website www.paymentprovider.com/new_payment. Currently I am using Net::HTTP.post_form Do you know any ways to achieve this?

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Is this ruby code thread safe?

- by Ben K.

Is this code threadsafe? It seems like it should be, because @myvar will never be assigned from multiple threads (assuming block completes in < 1s). But do I need to be worried about a situation where the second block is trying to read @myvar as it's being written? require 'rubygems' require 'eventmachine' @myvar = Time.now.to_i EventMachine.run do EventMachine.add_periodic_timer(1) do EventMachine.defer do @myvar = Time.now.to_i # some calculation and reassign end end EventMachine.add_periodic_timer(0.5) do puts @myvar end end

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Beginner to RUBY - Array Question

- by WANNABE

a = [ 1, 3, 5, 7, 9 ] ? [1, 3, 5, 7, 9] a[2, 2] = ’cat’ ? [1, 3, "cat", 9] a[2, 0] = ’dog’ ? [1, 3, "dog", "cat", 9] a[1, 1] = [ 9, 8, 7 ] ? [1, 9, 8, 7, "dog", "cat", 9] a[0..3] = [] ? ["dog", "cat", 9] a[5..6] = 99, 98 ? ["dog", "cat", 9, nil, nil, 99, 98] I can understand how the last four amendments to this array work, but why do they use a[2, 2] = 'cat' and a[2,0] = 'dog' ??? What do the two numbers represent? Couldnt they just use a[2] = 'dog'?

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Ruby Inserting Key, Value elements in Hash.

- by kokogyi

I want to add elements to my Hash lists, which can have more than one value. Here is my code. I don't know how I can solve it! class dictionary def initialize(publisher) @publisher=publisher @list=Hash.new() end def []=(key,value) @list << key unless @list.has_key?(key) @list[key] = value end end dic = Dictionary.new dic["tall"] = ["long", "word-2", "word-3"] p dic Many thanks in advance. regards, koko

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Ruby: output not saved to file

- by Sophie

I'm trying to give a file as input, have it changed within the program, and save the result to a file that is output. But the output file is the same as the input file. :/ Total n00b question, but what am I doing wrong?: puts "Reading Celsius temperature value from data file..." num = File.read("temperature.dat") celsius = num.to_i farenheit = (celsius * 9/5) + 32 puts "Saving result to output file 'faren_temp.out'" fh = File.new("faren_temp.out", "w") fh.puts farenheit fh.close

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Using WAMP's MySQL with Cygwin Ruby on Rails

- by Andrei

I'm trying to install a Rails app on a Cygwin Rails + WAMP MySQL setup, but rake trows an error : Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) Of course, it's trying to connect to MySQL trought a Cygwin socket, and since there's no MySQL server running on Cygwin, it fails. How do I get Rails to connect to WAMP's MySQL (perhaps through TCP/IP instead of a socket) ?

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best ruby on rails cms

- by Datis

i need to choose a cms for my next project, i have searched and come up with these 2 : radiant and refinery, which one is better for building middle size websites ? are there any other options out there for rails cms ? one important factor is that client can easily update their website without much knowledge thnx for helping

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Ruby on Rails: link_to_remote and rel

- by DerNalia

I want a link to remote to have a rel tag, because I want to use facebox with it. I had it working with a regular link to... but I needed the link to remote to handle the event that a user doesn't have javascript enabled. this, currently does't work (except for the non-javascript part ) <%= link_to_remote "Ask a Question", {:url => {:action => :ask_question, :id => @container.id.to_s, :javascript_disabled => false }, :rel => 'facebox'}, :href => url_for( :controller => :view, :action => :ask_question, :id => @container.id.to_s, :javascript_disabled => true) %>

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[Ruby on Rails] Generate 404 error

- by siulamvictor

I create a action called "error404" in controller "pages", I would like to display this action if the following situation occurred: the controller in URL is not existed the action in URL is not existed what should I do? I tried to follow the instruction in this page, http://stackoverflow.com/questions/2553365/show-a-404-instead-of-500-in-rails , but seems only work with first situation. Thanks for help. :)

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ruby on rails one-to-many relationship

- by fenec

I would like to model a betting system relationship using the power of rails. so lets start with doing something very simple modelling the relationship from a user to a bet.i would like to have a model bet with 2 primary keys. here are my migrations enter code here class CreateBets < ActiveRecord::Migration def self.up create_table :bets do |t| t.integer :user_1_id t.integer :user_2_id t.integer :amount t.timestamps end end def self.down drop_table :bets end end class CreateUsers < ActiveRecord::Migration def self.up create_table :users do |t| t.string :name t.timestamps end end def self.down drop_table :users end end the models enter code here class Bet < ActiveRecord::Base belongs_to :user_1,:class_name=:User belongs_to :user_2,:class_name=:User end class User < ActiveRecord::Base has_many :bets, :foreign_key =:user_1) has_many :bets, :foreign_key =:user_2) end when i test here in the console my relationships I got an error enter code here u1=User.create :name="aa" = # u2=User.create :name="bb" = # b=Bet.create(:user_1=u1,:user_2=u2) *****error***** QUESTIONS: 1 How do I define the relationships between these tables correctly? 2 are there any conventions to name the attributes (ex:user_1_id...) thank you for your help

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Docs for auto-generated methods in Ruby on Rails

- by macek

Rails has all sorts of auto-generated methods that I've often times struggled to find documentation for. For example, in routes.rb, if I have: map.resources :projects do |p| p.resources :tasks end This will get a plethora of auto-generate path and url helpers. Where can I find documentation for how to work with these paths? I generally understand how to work with them, but more explicit docs might help me understand some of the magic that happens behind the scenes. # compare project_path(@project) project_task_path(@project, @task) # to project_path(:id => @project.id) project_task_path(:project_id => @project.id, :id => @task.id) Also, when I change an attribute on a model, @post.foo_changed? will be true. Where can I find documentation for this and all other magical methods that are created like this? If the magic is there, I'd love to take advantage of it. And finally: Is there a complete resource for config.___ statements for environment.rb? I was able to find docs for Configuration#gem but what attributes can I set within the stubs like config.active_record.___, config.action_mailer.___, config.action_controller.___, etc. Again, I'm looking for a complete resource here, not just a settings for the examples I provided. Even if you can only answer one of these questions, please chime in. These things seem to have been hiding from me and it's my goal to get them some more exposure, so I'll be upvoting all links to docs that point me to what I'm looking for. Thanks! ps, If they're not called auto-generated methods, I apologize. Someone can teach me a lesson here, too :) Edit I'm not looking for tutorials here, folks. I have a fair amount of experience with rails; I'm just looking for complete docs. E.g., I understand how routing works, I just want docs where I can read about all of the usage options.

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what does ?\xfe mean in ruby?

- by aharon

I cam across the following code and couldn't figure out what was going on. def self.eof_packet?(data) data[0] == ?\xfe && data.length == 5 end

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Ruby Mechanize - Basic Get Failing

- by hutch

a = WWW::Mechanize.new { |agent| agent.user_agent_alias = 'Mac Safari' agent.history.max_size=0 } page = a.get('http://livingsocial.com/deals?preferred_city=18') Trying a very basic GET request using mechanize but get a 500, yet when I CURL I have no problems. Is there a problem with including parameters in a get() call? I know I am missing something simple

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Ruby on Rails activerecord find average in one sql and Will_Paginate

- by Darkerstar

Hi all I have the following model association: a student model and has_many scores. I need to make a list showing their names and average, min, max scores. So far I am using student.scores.average(:score) on each student, and I realise that it is doing one sql per student. How can I make the list with one joined sql? Also how would I use that with Will_Paginate plugin? Thank you

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Convert matched string of UTF-8 values to UTF-8 characters in Ruby

- by user1475154

Trying to convert output from a rest_client GET to the characters that are represented with escape sequences. Input: ..."sub_id":"\u0d9c\u8138\u8134\u3f30\u8139\u2b71"... (which I put in 'all_subs') Match: m = /sub_id\"\:\"([^\"]+)\"/.match(all_subs.to_str) [1] Print: puts m.force_encoding("UTF-8").unpack('U*').pack('U*') But it just comes out the same way I put it in. ie, "\u0d9c\u8138\u8134\u3f30\u8139\u2b71" However, if I convert a raw string of it: puts "\u0d9c\u8138\u8134\u3f30\u8139\u2b71".unpack('U*').pack('U*') The output is perfect as "??????"

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How to store private pictures and videos in Ruby on Rails

- by TK

Here's a story: User A should be able to upload an image. User A should be able to set a privacy. ("Public" or "Private"). User B should not be able to access "Private" images of User A. I'm planning to user Paperclip for dealing with uploads. If I store the images under "RAILS_ROOT/public/images", anyone who could guess the name of the files might access the files. (e.g., accessing http://example.com/public/images/uploads/john/family.png ) I need to show the images using img tags, so I cannot place a file except public. How can I ensure that images of a user or group is not accessible by others?

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