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• Can continuations be used as a replacement for recursion?

  - by Sam

  The following function generates a 'stack level too deep (SystemStackError)' for n = 5,000 def factorial(n) n == 0 ? 1 : factorial(n -1) * n end Is there a way to avoid this error using continuations/callcc? Note: I know this can be implemented without recursion. e.g. def factorial2(n) (1..n).inject(1) {|result, n| result * n } end

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• nested attributes with polymorphic has_one model

  - by Millisami

  I am using accepts_nested_attributes_for with the has_one polymorphic model in rails 2.3.5 Following are the models and its associations: class Address < ActiveRecord::Base attr_accessible :city, :address1, :address2 belongs_to :addressable, :polymorphic => true validates_presence_of :address1, :address2, :city end class Vendor < ActiveRecord::Base attr_accessible :name, :address_attributes has_one :address, :as => :addressable, :dependent => :destroy accepts_nested_attributes_for :address end This is the view: - form_for @vendor do |f| = f.error_messages %p = f.label :name %br = f.text_field :name - f.fields_for :address_attributes do |address| = render "shared/address_fields", :f => address %p = f.submit "Create" This is the partial shared/address_fields.html.haml %p = f.label :city %br= f.text_field :city %span City/Town name like Dharan, Butwal, Kathmandu, .. %p = f.label :address1 %br= f.text_field :address1 %span City Street name like Lazimpat, New Road, .. %p = f.label :address2 %br= f.text_field :address2 %span Tole, Marg, Chowk name like Pokhrel Tole, Shanti Marg, Pako, .. And this is the controller: class VendorsController < ApplicationController def new @vendor = Vendor.new end def create @vendor = Vendor.new(params[:vendor]) if @vendor.save flash[:notice] = "Vendor created successfully!" redirect_to @vendor else render :action => 'new' end end end The problem is when I fill in all the fileds, the record gets save on both tables as expected. But when I just the name and city or address1 filed, the validation works, error message shown, but the value I put in the city or address1, is not persisted or not displayed inside the address form fields? This is the same case with edit action too. Though the record is saved, the address doesn't show up on the edit form. Only the name of the Client model is shown. Actually, when I look at the log, the address model SQL is not queried even at all.

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• sql charateristic function for avg dates

  - by holden

  I have a query which I use to grab specific dates and a price for the date, but now I'd like to use something similar to grab the avg prices for particular days of the week. Here's my current query which works for specific dates to pull from a table called availables: SELECT rooms.name, rooms.roomtype, rooms.id, max(availables.updated_at), MAX(IF(to_days(availables.bookdate) - to_days('2009-12-10') = 0, (availables.price*0.66795805223432), '')) AS day1, MAX(IF(to_days(availables.bookdate) - to_days('2009-12-10') = 1, (availables.price*0.66795805223432), '')) AS day2, MAX(IF(to_days(availables.bookdate) - to_days('2009-12-10') = 2, (availables.price*0.66795805223432), '')) AS day3, MAX(IF(to_days(availables.bookdate) - to_days('2009-12-10') = 3, (availables.price*0.66795805223432), '')) AS day4, MAX(IF(to_days(availables.bookdate) - to_days('2009-12-10') = 4, (availables.price*0.66795805223432), '')) AS day5, MAX(IF(to_days(availables.bookdate) - to_days('2009-12-10') = 5, (availables.price*0.66795805223432), '')) AS day6, MAX(IF(to_days(availables.bookdate) - to_days('2009-12-10') = 6, (availables.price*0.66795805223432), '')) AS day7, MIN(spots) as spots FROM `availables` INNER JOIN rooms ON availables.room_id=rooms.id WHERE rooms.hotel_id = '5064' AND bookdate BETWEEN '2009-12-10' AND DATE_ADD('2009-12-10', INTERVAL 6 DAY) GROUP BY rooms.name ORDER BY rooms.ppl My first stab which doesn't work, probably because the DAYSOFWEEK function is much different from the to_days... SELECT rooms.id, rooms.name, MAX(IF(DAYOFWEEK(availables.bookdate) - DAYOFWEEK('2009-12-10') = 0, (availables.price*0.66795805223432), '')) AS day1, MAX(IF(DAYOFWEEK(availables.bookdate) - DAYOFWEEK('2009-12-10') = 1, (availables.price*0.66795805223432), '')) AS day2, MAX(IF(DAYOFWEEK(availables.bookdate) - DAYOFWEEK('2009-12-10') = 2, (availables.price*0.66795805223432), '')) AS day3, MAX(IF(DAYOFWEEK(availables.bookdate) - DAYOFWEEK('2009-12-10') = 3, (availables.price*0.66795805223432), '')) AS day4, MAX(IF(DAYOFWEEK(availables.bookdate) - DAYOFWEEK('2009-12-10') = 4, (availables.price*0.66795805223432), '')) AS day5, MAX(IF(DAYOFWEEK(availables.bookdate) - DAYOFWEEK('2009-12-10') = 5, (availables.price*0.66795805223432), '')) AS day6, MAX(IF(DAYOFWEEK(availables.bookdate) - DAYOFWEEK('2009-12-10') = 6, (availables.price*0.66795805223432), '')) AS day7,rooms.ppl AS spots FROM `availables` INNER JOIN `rooms` ON `rooms`.id = `availables`.room_id WHERE (rooms.hotel_id = 5064 AND rooms.ppl > 3 AND availables.price > 0 AND availables.spots > 1) GROUP BY rooms.name ORDER BY rooms.ppl Maybe i'm making this crazy hard and someone knows a much simpler way. It takes data that looks like this #Availables id room_id price spots bookdate 1 26 $5 5 2009-10-20 2 26 $6 5 2009-10-21 to: +----+-------+--------------------+---------------------+---------------------+---------------------+------+------+------+------+ | id | spots | name | day1 | day2 | day3 | day4 | day5 | day6 | day7 | +----+-------+--------------------+---------------------+---------------------+---------------------+------+------+------+------+ | 25 | 4 | Blue Room | 14.9889786921381408 | 14.9889786921381408 | 14.9889786921381408 | | | | | | 26 | 6 | Whatever | 13.7398971344599624 | 13.7398971344599624 | 13.7398971344599624 | | | | | | 27 | 8 | Some name | 11.2417340191036056 | 11.2417340191036056 | 11.2417340191036056 | | | | | | 28 | 8 | Another | 9.9926524614254272 | 9.9926524614254272 | 9.9926524614254272 | | | | | | 29 | 10 | Stuff | 7.4944893460690704 | 7.4944893460690704 | 7.4944893460690704 | | | | | +----+-------+--------------------+---------------------+---------------------+---------------------+------+------+------+---

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• Autodetect timezone in Rails given UTC offset and DST

  - by Jose

  I basically want to autodetect a user's timezone using Rails. I can use this JS code at the user's browser (http://www.onlineaspect.com/2007/06/08/auto-detect-a-time-zone-with-javascript/) to send a form with the UTC offset and the fact that the time zone observes DST during summer or not, in the user's time zone. Once I have that info in the server, I want to select the matching time zone. In Rails, I can get a list of time zones with ActiveSupport::TimeZone.all. Also, I can filter zones by utf offset thanks to the utc_offset method. However, I don't know how to filter the timezones that do/don't observe DST. E.g. suppose a user lives in Amsterdam. Filtering by UTC offset will return Berlin, Belgrado, Madrid, etc timezones, as well as West Central Africa. All of them, but West Central Africa, would be appropriate timezones for a user in Amsterdam (as they provide the same time/date), but I need to filter West Central Africa, which does not perform DST in summer. How can I do this in Rails? Also, are any of my assumptions wrong?

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• rails + compass: advantages vs using haml + blueprint directly

  - by egarcia

  I've got some experience using haml (+sass) on rails projects. I recently started using them with blueprintcss - the only thing I did was transform blueprint.css into a sass file, and started coding from there. I even have a rails generator that includes all this by default. It seems that Compass does what I do, and other things. I'm trying to understand what those other things are - but the documentation/tutorials weren't very clear. These are my conclusions: Compass comes with built-in sass mixins that implement common CSS idioms, such as links with icons or horizontal lists. My solution doesn't provide anything like that. (1 point for Compass). Compass has several command-line options: you can create a rails project, but you can also "install" it on an existing rails project. A rails generator could be personalized to do the same thing, I guess. (Tie). Compass has two modes of working with blueprint: "basic" and "semantic" usage. I'm not clear about the differences between those. With my rails generator I only have one mode, but it seems enough. (Tie) Apparently, Compass is prepared to use other frameworks, besides blueprint (e.g. YUI). I could not find much documentation about this, and I'm not interested on it anyway - blueprint is ok for me (Tie). Compass' learning curve seems a bit stiff and the documentation seems sparse. Learning could be a bit difficult. On the other hand, I know the ins and outs of my own system and can use it right away. (1 point for my system). With this analysis, I'm hesitant to give Compass a try. Is my analysis correct? Are Am I missing any key points, or have I evaluated any of these points wrongly?

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• has_many :through on self?

  - by Glex

  I have a User model. A user can be either a dj, a club, or a clubber (this is controlled by the User#account_type attribute). A club can have many djs, and a dj can have many users: enumerated_attribute :account_type, %w(^clubber dj club), :nil => false do label :clubber => "Clubber" label :dj => "DJ" label :club => "Club" end has_many :dj_club_relationships, :class_name => "User", :dependent => :destroy has_many :dj_user_relationships, :dependent => :destroy has_many :djs, :through => :dj_club_relationships, :class_name => "User" has_many :users, :through => :dj_user_relationships However, this doesn't work as well as expected, since Rails doesn't know, for example, that it needs to destroy all dj_club_relationships with club_id when the user being destroyed is a club, and with dj_id when the user is a dj. How can I help rails know about it?

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• How do I get the "Install Missing Plugin" yellow bar to appear in firefox when flash is not installe

  - by Janak

  My rails website uses the open_flash_graph plugin to generate flash graphs for my clients. If a customer doesn't have flash installed, it doesn't display any messages, it simply doesn't show any graphs. I've noticed that if I go to other websites that need flash, I get a yellow bar at the top of my firefox window that offers to "Install Missing Plugin". I assume something in the HTML lets firefox know that this webpage needs flash. What code do I need to add to my website to make this work?

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• Weird response for controller.request.format.html? in Rails

  - by Tony

  In my main controller, I have this: class MainController < ApplicationController before_filter do |controller| logger.info "controller.request.format.html? = #{controller.request.format.html?}" logger.info "controller.request.format.fbml? = #{controller.request.format.fbml?}" controller.send :login_required if controller.request.format.html? controller.send :facebook_auth_required if controller.request.format.fbml? end As expected, I get "true" for the ...fbml? line if a request comes from Facebook (my facebooker gem automatically sets the format). However, I get "5" for the ...html? line if the request comes from Facebook. Why would a method with a ? ever return a "5"? Isn't that against Rails conventions? Also, I think "5" is considered true so this might mess up my filters. Still looking into that... Any ideas?

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• Rmagick, Watermarks, and Image Transparency

  - by Hulihan Applications

  I'm having trouble making an image semi-transparent. I have one image I'd like to set to 50% opacity and position it over another image(using composite operator:OverCompositeOp). Anyone know how an easy way to do such a thing? A little background: I'm trying to make a good watermark to place over images, but I'm not fan of rmagick's built-in watermark() function or the shade-composite method.

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• Stack Overflow-like tag selector for Rails

  - by David Tildon

  I want to use tags for a model in my Rails application, and I'd like to have the same kind of tag selection mechanism that Stack Overflow has when asking a question. I.e. I type in 'rails' and it drops down a list of tags that include 'rails', and I can go on to add more tags from there. Is there a plugin that can do this? I'm comfortable putting together the tag model and migrations myself, that isn't an issue. I just need something to handle the AJAX and javascript. I'm using prototype and Rails 2.3.

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• cache_money only writing to memcached on creates and updates, and seemingly never looking in the cac

  - by Shane Liebling

  I seem to be having some extremely odd cache_money interactions. When I am on the console, and I create a new instance of a class and save it I see the cache misses and cache stores on my memcached console output. Then when the create finishes I see a bunch of cache deletions. If I then try to do any kind of find for the newly created object (or any other objects for that matter) I never see any cache access. This is highly confusing. I could kind of understand if all finds never hit the cache (though that in and of itself would be an issue requiring investigation), but finds do seem to hit the cache when the object is being created (checking for associations and such). Anyone have this experience in the past at all? Any thoughts? AFAIK there isn't really much in the way of configuration options for cache_money, and it certainly doesn't seem like there are any that would be on by default and be creating these kinds of symptoms. My cache_money config is basically straight out of the docs. Any help would be greatly appreciated.

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• ~/.irbrc not executed when starting irb or script/console

  - by Patrick Klingemann

  Here's what I've tried: 1. gem install awesome_print 2. echo "require 'ap'" >> ~/.irbrc 3. chmod u+x ~/.irbrc 4. script/console 5. ap { :test => 'value' } Result: NameError: undefined local variable or method `ap' for # Some additional info: Fedora 13 (observed this issues in prior versions of Fedora also) bash --version Produces: GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu) Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software; you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

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• Generate a controller with all the RESTful functions

  - by Barb

  Hello, I am trying to generate a controller with all the RESTful actions stubbed. I had read at link text that all I needed to do was to use call the generator with just a controller name I would get just that. So, I ran "script/generate rspec_controller Properties" and I got an empty controller. Any other suggestions would be greatly appreciated.

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• NGINX, Unicorn, Mediatemple dv server

  - by BandsOnABudget

  Anyone every try to set up nginx & unicorn for their rails apps on a mediatemple dv server? Did you document it?

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• Using JSON with jRails

  - by Zachary

  I am currently trying to use AJAX in my application via jRails. I am trying to return a JSON object from my controller, and then parse it in my Javascript. I am using json2.js to do the parsing. Here is the code I currently have: function getSomething() { $.ajax({ type: "GET", url: "map/testjson", success: function(data) { var myData = JSON.parse(data[0]); window.alert(myData.login); } }); } and in the controller: class Map::MapController < ApplicationController def index end def testjson @message = User.find(:all) ActiveRecord::Base.include_root_in_json = false respond_to do |w| w.json { render :json => @message.to_json } end end end The window.alert simply says 'undefined' (without tics). However, if I change the javascript to window.alert(data) (the raw object returned by the controller) I get: [{"salt":"aSalt","name":"", "created_at":"2010-03-15T02:34:25Z","remember_token_expires_at": null,"crypted_password":"aPassword", "updated_at":"2010-03-15T02:34:25Z","id":1,"remember_token":null, "login":"zgwrig2","email":"[email protected]"}] This looks like an array of size 1, if I'm looking at it correctly, but I have tried just about every combination of JSON.parse on the data object that I can think of, and nothing seems to work. Any ideas on what I'm doing wrong here?

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• Nested Forms not passing belongs_to :id

  - by Bill Christian

  I have the following model class Project < ActiveRecord::Base has_many :assignments, :conditions => {:deleted_at => nil} has_many :members, :conditions => {:deleted_at => nil} accepts_nested_attributes_for :members, :allow_destroy => true end class Member < ActiveRecord::Base belongs_to :project belongs_to :person belongs_to :role has_many :assignments, :dependent => :destroy, :conditions => {:deleted_at => nil} accepts_nested_attributes_for :assignments, :allow_destroy => true validates_presence_of :role_id validates_presence_of :project_id end and I assume the controller will populate the member.project_id upon project.save for each nested member record. However, I get a validation error stating the project_id is blank. My controller method: def create # @project is created in before_filter if @project.save flash[:notice] = "Successfully created project." redirect_to @project else render :action => 'new' end end Do I need to manually set the project_id in each nested member record? Or what is necessary for the controller to populate when it creates the member records?

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• Is there anyway to make a Rails / Rack application tell the web server to drop the connection

  - by dasil003

  There are many security reasons why one would want to drop an HTTP connection with no response (eg. OWASP's SSL best practices). When these can be detected at the server level then it's no big deal. However, what if you can only detect this condition at the application level? Does Rails, or more generally Rack, have any standard way of telling the server to drop the connection without a response? If not, are there some standard headers to pass in that will accomplish that in common web servers (I'm thinking Nginx or Apache)? Even if there is not a standard header is there a reasonable way to configure that behavior? Is this a fool's errand?

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• Any working tutorials for Authlogic?

  - by Mark Wilbur

  I've been trying to build my first rails app and have gotten stuck on the issue of user authentication. I've found a number of tutorials for using various plug-ins to do this, but so far every single one of them is out-dated, and as a result, broken! From what I've read, I think Authlogic may be the best fit for me, and I've tried two things: 1) Going through Railscast, episode #160 (which is a tutorial for setting it up) 2) Using Ryan B's nifty_authentication gem with the --authlogic tag In both cases, I get the following error as soon as I try to do anything with a user: undefined local variable or method `acts_as_authentic' for # I believe this is from the User model: class User < ActiveRecord::Base acts_as_authentic end I'm sure I've installed the authlogic gem, and I've added config.gem "authlogic" to my environment.rb Any ideas about what's wrong? Anybody know of a complete and up to date tutorial for adding user authentication?

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• Can Nokogiri Parse a Nokogiri Object?

  - by Jesse J

  I'm trying to parse a part of the result of a parse, like this: queries = @doc.xpath("//spectrum_query") queries.each do |query| hits = query.xpath("//search_hit") end But instead of Nokogiri only searching for search_hits inside the query, it searches for search_hits in the whole document. I'm sure there's a different way to accomplish what I want, but doing it like this would be the simplest. Anyone know if it's possible to search just the query object?

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• Rails - How can I display nicely indented JSON?

  - by sa125

  Hi - I have a controller action that returns JSON data for api purposes, and plenty of it. I want to be able to inspect it in the browser, and have it nicely indented for the viewer. For example, if my data is data = { :person => { :id => 1, :name => "john doe", :age => 30 }, :person => ... } I want to see { "person" : { "id" : 1, "name" : "john doe", "age" : 30, }, "person" : { "id" : 2, "name" : "jane doe", "age" : 31, }, ...etc } In the view. I thought about using different routes to get the bulk/pretty data: # GET /api/json # ... respond_to do |format| format.html { render :json => data.to_json } end # GET /api/json/inspect # ... respond_to do |format| format.html { render :text => pretty_json } end Anyone knows of a gem/plugin that does this or something similar? I tried using JSON.pretty_generate, but it doesn't seem to work inside rails (2.3.5). thanks.

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• Rails — Formtastic, how to set text for options in select?

  - by TJY

  f.input :some_model_values, :as => :select Using Formtastic, I need to set a text for options on my select input, but not populated from :some_model_values.

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• Odd Drag and drop sorting error Rails for nested attributes

  - by Senthil

  I've got this weird bug when trying to use drag and drag for two models (one nested within another). I've a category model which has many apps. In my category index page, I tried use "content_tag_for" to sort categories and apps within each category. But for some odd reason only the first element has drag, drop enabled. I can drag and drop categories all I want, but I can't drag the app in the second category, just the first category. Copy and paste gets ridiculously hopeless with HAML, so here's a Pastie instead. I made a sample app on heroku for you to check out here. Drag and drag work for both category and app, so I'm guessing it has to do something with the ul or li. Any help is appreciated. Thanks.

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• Hash#key for 1.8.6

  - by Tobias

  Greetings, I am trying to make my 1.9.1 source 1.8.6 compatible. I recognized that there's no Hash#key method. Any idea or method how to solve that? Thanks! Tobias

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• How to show server errors in Rails 2.3.5 with JSON and jQuery

  - by Fortuity

  I've got in-place editing on a page in my app (using Rails 2.3.5 and jQuery). I want to know how to display an error on the page when the update fails. I'm using ajax (an XMLHttpRequest) to save an update to a Comment object. The controller has an update method like this: def update @comment = Comment.find(params[:id]) respond_to do |format| # if @comment.update_attributes!(params[:comment]) if false #deliberately forcing a fail here to see what happens format.json { render :nothing => true } else format.json { render :json => @comment.errors, :status => :unprocessable_entity } end end end In Firebug, I can see the server returns a "422" (an appropriate validation error status code). But it's a response to an XMLHttpRequest so there is no redirect to an error page. I think I actually want to do this: format.json { render :json => @comment.errors} or maybe this: format.json {render :json => { :status => :error, :message => "Could not be saved" }.to_json, :status => 400 } and trigger some Javascript function that iterates through (and displays) any errors. I'm using a rails plugin http://github.com/janv/rest_in_place/ to implement the in-place editing. It doesn't appear to have any callback function to handle a failure. What are my options? Can I write some Javascript to respond to a failure condition without hacking the plugin? Do I have to hack the rest_in_place plugin to handle a failure condition? Is there a better plugin (for Rails or jQuery) that handles in-place editing, including failure conditions? UPDATE This post from Peter Bui (http://paydrotalks.com/posts/45-standard-json-response-for-rails-and-jquery) was helpful in showing how to handle an error message from the server using XMLHttpRequest.status. I looked at his implementation of a blog using ajax (http://github.com/paydro/talks). I'm surprised at the complexity required to handle a simple error condition. Usually Rails has all the goodness baked in but it seems server errors with JSON are out of scope. Can that be? I also looked at grimen's validatious-on-rails (http://github.com/grimen/validatious-on-rails/) which accommodates models validations when ajax XMLHttpRequest is used. It's not clear to me how I'd use it to handle the general case of a "save" failing when validations succeed. P.S. Please vote me up... so I can use more than one HTML link when I ask my question :-)

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• Rails 2.3 uniqueness validation - how can I capture the value causing the error

  - by sa125

  Hi - I'm trying to capture the value that's throwing a uniqueness error (or for that matter, any other type of built-in validation) to display it in the :message option. Here's what I tried (didn't work) # inside the model validate_uniqueness_of :name, :message => "#{name} has already been taken" # also tried using #{:name} I could use a custom validation, but this beats the point of using something that's already integrated into AR. Any thoughts? thanks.

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