rails - Page 37 - Developer IT

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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IIS as proxy to rails/mongrel - force a proxied host to generate REMOTE_USER

- by rbn

Hello -- Using Application Request Routing I have IIS 7.5 set up as a reverse proxy to a Mongrel service which is serving a rails app. IIS is set up to use Windows Auth and is working but I cannot access the REMOTE_USER variable in the rails app to get at current user's identity. I have inspected the request object in rails and I don't have any other variables like LOGON_USER, HTTP_REMOTE_USER, AUTH_USER, etc. I am trying to find a way to inject the REMOTE_USER variable into Mongrel's server variables. This post describes what I am looking for using mod_rewrite on Apache but I am having trouble recreating this rule for iis. this is the rewrite rule from the post mentioned above for Apache RewriteEngine On RewriteCond %{LA-U:REMOTE_USER} (.+) RewriteRule . - [E=RU:%1] Header add X-Forwarded-User %{RU}e I tried reproducing the rule in IIS and got a URL Rewrite Module error ("The condition's expression "%{LA-U:REMOTE_USER}" is invalid."). I know I'm probably using Apache syntax where IIS syntax is needed but am not sure how to proceed at this point. Any help greatly appreciated.

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Rails, RSpec and Webrat: Expected output matches rendered output but still getting error in view spe

- by Anthony Burns

Hello all, I've just gotten started using BDD with RSpec/Cucumber/Webrat and Rails and I've run into some frustration trying to get my view spec to pass. First of all, I am running Ruby 1.9.1p129 with Rails 2.3.2, RSpec and RSpec-Rails 1.2.6, Cucumber 0.3.11, and Webrat 0.4.4. Here is the code relevant to my question config/routes.rb: map.b_posts 'backend/posts', :controller => 'backend/posts', :action => 'backend_index', :conditions => { :method => :get } map.connect 'backend/posts', :controller => 'backend/posts', :action => 'create', :conditions => { :method => :post } views/backend/posts/create.html.erb: <% form_tag do %> <% end %> *spec/views/backend/posts/create.html.erb_spec.rb:* describe "backend/posts/create.html.erb" do it "should render a form to create a post" do render "backend/posts/create.html.erb" response.should have_selector("form", :method => 'post', :action => b_posts_path) do |form| # Nothing here yet. end end end Here is the relevant part of the output when I run script/spec: 'backend/posts/create.html.erb should render a form to create a post' FAILED expected following output to contain a <form method='post' action='/backend/posts'/> tag: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <html><body><form action="/backend/posts" method="post"> </form></body></html> It would appear to me that what have_selector is looking for is exactly what the template generates, yet the example still fails. I am very much looking forward to seeing my error (because I have a feeling it is my error). Any help is much appreciated!

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rails test.log is always empty

- by Raiden

All the log entries generated when running tests with 'rake' are written to my development.log instead of test.log file Do I have to explicitly enable logging for test in enviornments/test.config?? (I'm using 'turn' gem to format test output, Can that cause an issue?) I'm running rails 2.3.5, ruby 1.8.7 I've all these gems installed for RAILS_ENV=test. Any help is appreciated. -[I] less -[I] treetop = 1.4.2 - [I] polyglot = 0.2.5 - [I] mutter = 0.4.2 - [I] mysql - [I] authlogic - [R] activesupport - [I] turn - [I] ansi = 1.1.0 - [I] facets = 2.8.0 - [I] rspec = 1.2.0 - [I] rspec-rails = 1.2.0 - [I] rspec = 1.3.0 - [R] rack = 1.0.0 - [I] webrat = 0.4.3 - [I] nokogiri = 1.2.0 - [R] rack = 1.0 - [I] rack-test = 0.5.3 - [R] rack = 1.0 - [I] cucumber = 0.2.2 - [I] term-ansicolor = 1.0.4 - [I] treetop = 1.4.2 - [I] polyglot = 0.2.5 - [I] polyglot = 0.2.9 - [R] builder = 2.1.2 - [I] diff-lcs = 1.1.2 - [R] json_pure = 1.2.0 - [I] cucumber-rails - [I] cucumber = 0.6.2 - [I] term-ansicolor = 1.0.4 - [I] treetop = 1.4.2 - [I] polyglot = 0.2.5 - [I] polyglot = 0.2.9 - [R] builder = 2.1.2 - [I] diff-lcs = 1.1.2 - [R] json_pure = 1.2.0 - [I] database_cleaner = 0.2.3 - [I] launchy - [R] rake = 0.8.1 - [I] configuration = 0.0.5 - [I] faker - [I] populator - [R] flog = 2.1.0 - [R] flay - [I] rcov - [I] reek - [R] ruby_parser ~ 2.0 - [I] ruby2ruby ~ 1.2 - [R] sexp_processor ~ 3.0 - [R] ruby_parser ~ 2.0 - [R] sexp_processor ~ 3.0 - [I] roodi - [R] ruby_parser - [I] gruff - [I] rmagick - [I] ruby-prof - [R] jscruggs-metric_fu = 1.1.5 - [I] factory_girl - [I] notahat-machinist

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Rails: Ajax: Changes Onload

- by Jay Godse

Hi. I have a web layout of a for that looks something like this <html> <head> </head> <body> <div id="posts"> <div id="post1" class="post" >  </div> <div id="post2" class="post" >  </div>  <div id="post99" class="post" >  </div> </div> </body> </html> I would like to be able to load and render the page with a blank , and then have a function called when the page is loaded which goes in and load up the posts and updates the page dynamically. In Rails, I tried using "link_to_remote" to update with all of the elements. I also tweaked the posts controller to render the collection of posts if it was an ajax request (request.xhr?). It worked fine and very fast. However the update of the blank div is triggered by clicking the link. I would like the same action to happen when the page is loaded so that I don't have to put in a link. Is there a Rails Ajax helper or RJS function or something in Rails that I could use to trigger the loading of the "posts" after the page has loaded and rendered (without the posts)? (If putsch comes to shove, I will just copy the generated JS code from the link_to_remote call and have it called from the onload handler on the body).

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Backing up my locally hosted rails apps in preparation for OS upgrade

- by stephen murdoch

I have some apps running on Heroku. I will be upgrading my OS in two weeks. The last time I upgraded though (6 months ago) I ran into some problems. Here's what I did: copied all my rails apps onto DVD upgraded OS transferred rails apps from DVD to new OS Then, after setting up new SSH-keys I tried to push to some of my heroku apps and, whilst I can't remember the exact error message off-hand, it more or less amounted to "fatal exception the remote end hung up" So I know that I'm doing something wrong here. First of all, is there any need for me to be putting my heroku hosted rails apps onto DVD? Would I be better just pulling all my apps from their heroku repos once I've done the upgrade? What do others do here? The reason I stuck them on DVD is because I tend to push a specific production branch to Heroku and sometimes omit large development files from it... Secondly, was this problem caused by SSH keys? Should I have backed up the old keys and transferred them from my old OS to my new one too, or is Heroku perfectly happy to let you change OS's like that? My solution in the end was to just create new heroku apps and reassign the custom domain names in heroku add-ons menu... I never actually though of pulling from the heroku repos as I tend to push a specific branch to heroku and that branch doesn't always have all the development files in it... I realise that the error message I mentioned doesn't particularly help anyone but I didn't think to remember it 6 months ago. Any advice would be appreciated PS - when I say upgrade, I mean full install of the new version with full format of the HDD.

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Throttling outbound API calls generated by a Rails app

- by Sharpie

I am not a professional web developer, but I like to wrench on websites as a hobby. Recently, I have been playing with developing a Rails app as a project to help me learn the framework. The goal of my toy app is to harvest data from another service through their API and make it available for me to query using a search function. However, the service I want to pull data from imposes a rate limit on the number of API calls that may be executed per minute. I plan on having my app run a daily update which may generate a burst of API calls that far exceeds the limit provided by the external service. I wish to respect the performance of the external site and so would like to throttle the rate at which my app executes the calls. I have done a little bit of searching and the overwhelming amount of tutorial material and pre-built libraries I have found cover throttling inbound API calls to a web app and I can find little discussion of controlling the flow of outbound calls. Being both an amateur web developer and a rails newbie, it is entirely possible that I have been executing the wrong searches in the wrong places. Therefore my questions are: Is there a nice website out there aggregating Rails tutorials that has material related to throttling outbound API requests? Are there any ruby gems or other libraries that would help me throttle the requests? I have some ideas of how I might go about writing a throttling system using a queue-based worker like DelayedJob or Resque to manage the API calls, but I would rather spend my weekends building the rest of the site if there is a good pre-built solution out there already.

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Ruby on Rails ActiveRecord/Include/Associations can't get my query to work

- by Cypher

I just started learning Rails and I'm just trying to set up query via associations. All the queries I try to write seem to be doing bizzare things and end up trying to query two tables parsed together with an '_' as one table. I have no clue why this would ever happen My tables are as follows: schools: id name variables: id name type var_entries: id variable_id entry school_entries: id school_id var_entry_id my rails association tables are $local = { :adapter => "mysql", :host => "localhost", :port => "3306".to_i, :database => "spy_2", :username =>"root", :password => "vertrigo" } class School < ActiveRecord::Base establish_connection $local has_many :school_entries has_many :var_entries, :through => school_entries end class Variable < ActiveRecord::Base establish_connection $local has_many :var_entries has_many :school_entries, :through => :var_entries end class VarEntry < ActiveRecord::Base establish_connection $local has_many_and_belongs_to :school_entries belongs_to :variables end class SchoolEntry < ActiveRecord::Base establish_connection $local belongs_to :school has_many :var_entries end I want to do this sql query: SELECT school_id, variable_id,rank FROM school_entries, variables, var_entries, schools WHERE var_entries.variable_id = variables.id AND school_entries.var_entry_id = var_entries.id AND schools.id = school_entries.school_id AND variables.type = 'number'; and put it into Rails notation: here is one of my many failed attempts schools = VarEntry.all(:include => [:school_entries, :variables], :conditions => "variables.type = 'number'") the error: 'const_missing': uninitialized constant VarEntry::Variables (NameError) if i remove variables schools = VarEntry.all(:include => [:school_entries, :variables], :conditions => "type = 'number'") the error is: Mysql::Error: Unkown column 'type' in 'where clause': SELECT * FROM 'var_entries' WHERE (type=number) (ActiveRecord::StatementInvalid) Can anyone tell me where I'm going horribly wrong?

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Building an extension framework for a Rails app

- by obvio171

I'm starting research on what I'd need in order to build a user-level plugin system (like Wordpress plugins) for a Rails app, so I'd appreciate some general pointers/advice. By user-level plugin I mean a package a user can extract into a folder and have it show up on an admin interface, allowing them to add some extra configuration and then activate it. What is the best way to go about doing this? Is there any other opensource project that does this already? What does Rails itself already offer for programmer-level plugins that could be leveraged? Any Rails plugins that could help me with this? A plugin would have to be able to: run its own migrations (with this? it's undocumented) have access to my models (plugins already do) have entry points for adding content to views (can be done with content_for and yield) replace entire views or partials (how?) provide its own admin and user-facing views (how?) create its own routes (or maybe just announce its presence and let me create the routes for it, to avoid plugins stepping on each other's toes) Anything else I'm missing? Also, is there a way to limit which tables/actions the plugin has access to concerning migrations and models, and also limit their access to routes (maybe letting them include, but not remove routes)? P.S.: I'll try to keep this updated, compiling stuff I figure out and relevant answers so as to have a sort of guide for others.

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Rails: constraint violation on create but not on update

- by justinbach

Note: This is a "railsier" (and more succinct) version of this question, which was getting a little long. I'm getting Rails behavior on a production server that I can't replicate on the development server. The codebases are identical save for credentials and caching settings, and both are powered by Oracle 10g databases with identical schema (but different data). My Rails application contains a user model, which has_one registration; registration in turn has_and_belongs_to_many company_ownerships through a registration_ownerships table. Upon registering, users fill out data pertinent to all three models, including a series of checkboxes indicating what registration_ownerships might apply to their account. On the dev server, the registration process is seamless, no matter what data is entered. On production, however, if users check off any of the company ownership fields before submitting their registration, Oracle complains about a constraint violation on the primary key of the company_ownerships table (which is a two-field key based on company_ownership_id and registration_id) and users get the standard Rails 500 error screen. In every case, I've verified that no conflicting record on these two fields exists in the production database, so I don't know why the constraint is getting violated. To further confuse things, if a user registers without listing any ownerships and later goes back and modifies their account to reflect ownership data (which is done through the same interface), the application happily complies with their request and Oracle is well-behaved (this is both on production and dev). I've spent the past couple days trying to figure out what might be causing this problem and am reaching the end of my wits. Any advice would be greatly appreciated!

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Problem with date_select when using :discard option. (Rails)

- by MikeH

I'm using a date_select with the option :discard_year => true If a user selects a date in the date select, and then he comes back and returns the select to the prompt values of Month and Day, Rails automatically sets the select values to January 1. I know this is the intended functionality if a month is selected and a day is left blank, but that's not the case here. In my example, the user sets both the month and day back to the prompt. By Rails forcing January 1, I'm getting bad results. I've tried every parameter available in the api. :default = nil, :include_blank = true. None of those change the behavior I'm describing. I've isolated the root of the problem, which is this: Because I'm discarding the :year parameter, when the user tries to return the month and day to the prompt values, Rails doesn't see an empty prompt select. It perhaps sees a year selected with empty month and day, which it then sets to January 1. This is the case because the :discard_year parameter does in fact set a date in the database, it just removes it from the view. How can I code around this problem?

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Helping Rails Newbies identify version-specific information on web pages

- by corprew

I am trying to help some people getting started programming on rails identify which version that advice found on web pages corresponds to, and am seeking advice and/or guides on how to do it so they don't have to rely on me and/or waste time trying outdated advice. Narrative: I am helping some people get up to speed on rails development, and their stock response to running into problems is searching google for advice. They're using 2.3.5 and thinking of moving to 3. The problem they're running into is that there's a lot of advice out there specific to older rails versions (2.2 for example being popular) that isn't identified. I can usually figure out when the pages are old pretty easily, but they can't (yet.) It seems like random web page authors don't identify which version they're using when they're using the current version, and not all pages are dated. This seems to be a general problem that will get worse -- current unadorned advice is usually 2.3.5 and older unadorned advice is 2.2.x at this point, but people are moving / will be moving to version 3 over the next while and newbies will be stuck looking at a bunch of deprecated/incompatible 2.3.x advice without realizing which version it is. Any advice / pointers / telltales?

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need help fixing unique key in rails. rails is adding id causing duplicate key

- by railsnew

I need some help in fixing the below issue. I had transaction blocks in my rails code like below: @sqlcontact = "INSERT INTO contacts (id,\"cid\", \"hphone\", mphone, provider, cemail, email, sms , mail, phone) VALUES ('"+@id1+"','" + @id1 + "', '"+ params[:hphone] + "', '"+params[:mphone]+ "', '" + params[:provider] + "', '" + params[:cemail]+ "', '" + @varemail+ "', '"+@varsms+ "', '"+ @varmail+"', '"+@varphone+"')" my app was deployed to heroku so I was advised by them to remove transaction blocks. So I changed the above to: @cont = Contact.new(:id => @id1, :cid => @id1, :hphone => params[:hphone], :mphone => params[:mphone], :provider => params[:provider], :cemail => params[:cemail], :email => @varemail, :sms => @varsms, :mail => @varmail, :phone => @varphone) @cont.save My app also already had data stored. Now the problem is that when I try to save a record ...I keep getting the error: duplicate key value violates unique constraint "contacts_pkey" The error also shows the sql query trying to insert data ...however, in that sql query i Do not see id value. As you can see from my code that I am passing the id. then why is rails not accepting it? does it always include its own sequential id? can I not overwrite the default rails magic? and if it does that...does it not look at data that is already in the DB?? I am really stuck here. What should I do? should I just go back to my transaction block

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Inconsistent behavior working with "Flex on Rails" example.

- by kmontgom

I'm experimenting with Flex and Rails right now (Rails is cool). I'm following the examples in the book "Flex on Rails", and I'm getting some puzzling and inconsistent behavior. Heres the Flex MXML: <mx:HTTPService id="index" url="http://localhost:3000/people.xml" resultFormat="e4x" /> <mx:DataGrid dataProvider="{index.lastResult.person}" width="100%" height="100%"> <mx:columns> <mx:DataGridColumn headerText="First Name" dataField="first-name"/> <mx:DataGridColumn headerText="Last Name" dataField="last-name"/> </mx:columns> </mx:DataGrid> <mx:Script> <![CDATA[ import mx.controls.Alert; private function main():void { Alert.show( "In main()" ); } ]]> </mx:Script> When I run the app from my IDE (Amythyst beta, also cool), the DataGrid appears, but is not populated. The Alert.show() also triggers. When I go out to a web browser and manually enter the url (http://localhost:3000/people.xml), the Mongrel console shows the request coming through and the browser shows the web response. No exceptions or other error messages occur. Whats the difference? Do I need to alter some OS setting? I'm using Win7 on an x64 machine.

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Rails uploaded file blank

- by Ceilingfish

Hi chaps, I'm trying to upload a file to the server using a HTTP multipart form in rails, and for some reason it's turning up blank at the other end. I can see it being received in the rails log thusly: Processing Admin::HeadlinesController#update (for 127.0.0.1 at 2010-03-08 12:26:13) [PUT] Parameters: {"commit"=>"Save changes", "action"=>"update", "_method"=>"put", "authenticity_token"=>"mK70XRk5gOPUwXOcNboT/4K8PD9RBM7GqCOlEUKZwcA=", "headline"=>{"position"=>"1", "location"=>"primary", "attachment_id"=>"13", "headline_content"=>"questionnaires", "article_id"=>"3", "image"=>#<File:/tmp/RackMultipart20100308-63211-1vym9nj-0>}, "id"=>"140", "controller"=>"admin/headlines"} But if I have a look in /tmp/RackMultipart20100308-63211-1vym9nj-0 the file is blank. Am I right in thinking that this should be the file that I uploaded? I'm running Phusion Passenger 2.2.7 on Apache 2.2.13, with ruby 1.8.7 and rails 2.3.5, on OSX 10.6.2

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SystemStackError in Rails::ActiveSupport::Callbacks

- by coreyward

I'm building a Rails app that connects to Dropbox and syncs with a folder to update a personal site. I'm using Rails 3.0.3, Ruby 1.9.2, and the Dropbox gem. Right now I have a DropboxAccounts Controller, and two models: DropboxSession, which wraps calls to the gem with application-specific functionality, and DropboxAccount, which stores the session and settings in the database. After the user authorizes their account with Dropbox they're redirected back over and the DropboxAccount is saved with the authorized session. That all works just fine. My problem is that when I try to call Dropbox::API#create_folder(any path) I end up with a SystemStackError in lib/activesupport/callbacks.rb:421 which refers to the code below. If I remove the call to create the folder, it works. If I call create folder from another request, it works. I doubled the stack size to 16K to no avail. # This is called the first time a callback is called with a particular # key. It creates a new callback method for the key, calculating # which callbacks can be omitted because of per_key conditions. # def __create_keyed_callback(name, kind, object, &blk) #:nodoc: @_keyed_callbacks ||= {} @_keyed_callbacks[name] ||= begin str = send("_#{kind}_callbacks").compile(name, object) class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1 def #{name}() #{str} end # THIS IS LINE 421 protected :#{name} RUBY_EVAL true end end I'm not very familiar with Rails yet, and I'm not sure what the intention of the code above is or why it would cause a stack overflow. I'm not using any method_missing/ghost method magic in my code. I suspected it was something with a callback serialize :files but commenting it out did nothing. My DropboxAccount model contains only a call to belongs_to :user, and DropboxSession is just a handful of methods, none of which contain callbacks. Bypassing them and using the Dropbox::Session methods directly doesn't help. I hope someone on StackOverflow can help me with this stack overflow. ;)

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Rails Browser Detection Methods

- by alvincrespo

Hey Everyone, I was wondering what methods are standard within the industry to do browser detection in Rails? Is there a gem, library or sample code somewhere that can help determine the browser and apply a class or id to the body element of the (X)HTML? Thanks, I'm just wondering what everyone uses and whether there is accepted method of doing this? I know that we can get the user.agent and parse that string, but I'm not sure if that is that is an acceptable way to do browser detection. Also, I'm not trying to debate feature detection here, I've read multiple answers for that on StackOverflow, all I'm asking for is what you guys have done. [UPDATE] So thanks to faunzy on GitHub, I've sort of understand a bit about checking the user agent in Rails, but still not sure if this is the best way to go about it in Rails 3. But here is what I've gotten so far: def users_browser user_agent = request.env['HTTP_USER_AGENT'].downcase @users_browser ||= begin if user_agent.index('msie') && !user_agent.index('opera') && !user_agent.index('webtv') 'ie'+user_agent[user_agent.index('msie')+5].chr elsif user_agent.index('gecko/') 'gecko' elsif user_agent.index('opera') 'opera' elsif user_agent.index('konqueror') 'konqueror' elsif user_agent.index('ipod') 'ipod' elsif user_agent.index('ipad') 'ipad' elsif user_agent.index('iphone') 'iphone' elsif user_agent.index('chrome/') 'chrome' elsif user_agent.index('applewebkit/') 'safari' elsif user_agent.index('googlebot/') 'googlebot' elsif user_agent.index('msnbot') 'msnbot' elsif user_agent.index('yahoo! slurp') 'yahoobot' #Everything thinks it's mozilla, so this goes last elsif user_agent.index('mozilla/') 'gecko' else 'unknown' end end return @users_browser end

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Design pattern to integrate Rails with a Comet server

- by empire29

I have a Ruby on Rails (2.3.5) application and an APE (Ajax Push Engine) server. When records are created within the Rails application, i need to push the new record out on applicable channels to the APE server. Records can be created in the rails app by the traditional path through the controller's create action, or it can be created by several event machines that are constantly monitoring various inputstream and creating records when they see data that meets a certain criteria. It seems to me that the best/right place to put the code that pushes the data out to the APE server (which in turn pushes it out to the clients) is in the Model's after_create hook (since not all record creations will flow through the controller's create action). The final caveat is I want to push a piece of formatted HTML out to the APE server (rather than a JSON representation of the data). The reason I want to do this is 1) I already have logic to produce the desired layout in existing partials 2) I don't want to create a javascript implementation of the partials (javascript that takes a JSON object and creates all the HTML around it for presentation). This would quickly become a maintenance nightmare. The problem with this is it would require "rendering" partials from within the Model (which im having trouble doing anyhow because they don't seem to have access to Helpers when they're rendered in this manner). Anyhow - Just wondering what the right way to go about organizing all of this is. Thanks

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Deploying a Rails app on an Ubuntu server using Git

- by NudeCanalTroll

I'm completely new to Linux, but today I find myself setting up a server (Ubuntu 10.04 LTS lucid) from scratch to host a Rails application. Anyway, I managed to get a Rails app up and running on the server itself, but I had to scrap that because I want to use Git. So I setup a git repository on the server, then pushed all the code from my local machine to the repository. Buuuut, of course Git doesn't actually store the files themselves in the repository -- all the code for my Rails app is now only on my local machine. How am I supposed to tell the server to host that? Right now my solution is to have the server use git to pull the code from its own repository. That's the code I'll host for all the world to see. In order to update the code, I guess I'll have to do something like this: Update the code on my local machine. Do some git adds, git commits, and a git push. On the server, do a git pull to update the code. So my question is, am I doing this the right way? enter code here

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Using tarantula to test a Rails app

- by Benjamin Oakes

I'm using Tarantula to test a Rails app I'm developing. It works pretty well, but I'm getting some strange 404s. After looking into it, Tarantula is following DELETE requests (destroy actions on controllers) throughout my app when it tests. Since Tarantula gets the index action first (and seems to keep a list of unvisited URLs), it eventually tries to follow a link to a resource which it had deleted... and gets a 404. Tarantula is right that the URL doesn't exist anymore (because it deleted the resource itself). However, it's flagging it as an error -- that's hardly the behavior I would expect. I'm basically just using the Rails scaffolding and this problem is happening. How do I prevent Tarantula doing this? (Or, is there a better way of specifying the links?) Updates: Still searching, but I found a relevant thread here: http://github.com/relevance/tarantula/issues#issue/3 Seems to be coming from relying on JS too much, in a way (see also http://thelucid.com/2010/03/15/rails-can-we-please-have-a-delete-action-by-default/)

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SQL with HAVING and temp table not working in Rails

- by chrisrbailey

I can't get the following SQL query to work quite right in Rails. It runs, but it fails to do the "HAVING row_number = 1" part, so I'm getting all the records, instead of just the first record from each group. A quick description of the query: it is finding hotel deals with various criteria, and in particular, priortizing them being paid, and then picking the one with the highest dealrank. So, if there are paid deal(s), it'll take the highest one of those (by dealrank) first, if no paid deals, it takes the highest dealrank unpaid deal for each hotel. Using MAX(dealrank) or something similar does not work as a way to pick off the first row of each hotel group, which is why I have the enclosing temptable and the creation of the row_number column. Here's the query: SELECT *, @num := if(@hid = hotel_id, @num + 1, 1) as row_number, @hid := hotel_id as dummy FROM ( SELECT hotel_deals.*, affiliates.cpc, (CASE when affiliates.cpc 0 then 1 else 0 end) AS paid FROM hotel_deals INNER JOIN hotels ON hotels.id = hotel_deals.hotel_id LEFT OUTER JOIN affiliates ON affiliates.id = hotel_deals.affiliate_id WHERE ((hotel_deals.percent_savings = 0) AND (hotel_deals.booking_deadline = ?)) GROUP BY hotel_deals.hotel_id, paid DESC, hotel_deals.dealrank ASC) temptable HAVING row_number = 1 I'm currently using Rails' find_by_sql to do this, although I've also tried putting it into a regular find using the :select, :from, and :having parts (but :having won't get used unless you have a :group as well). If there is a different way to write this query, that'd be good to know too. I am using Rails 2.3.5, MySQL 5.0.x.

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Weird code appearing when I loop over model instances in Rails

- by Tom Maxwell

In my Rails app I'm trying to loop over the Submission instances inside my Folder instances with Rails templating code. It works. However, it's also returning each instance in code which doesn't seem to be JSON. It's what's returned when you look up an instance in the Rails console. Here's an example: #<Submission id: 112, title: nil, content: nil, created_at: "2013-10-10 23:29:39", updated_at: "2013-10-10 23:29:39", user_id: 1, folder_id: 1, parent_id: nil> Here's what the code looks like for the loop: <%= @folder.submissions.each do |x| %> <% if x.title != nil %> <div id="<%= x.id %>" class="submission-textual"> <h1><%= x.title %></h1> </div> <% else %> <% end %> <% end %> I checked my Folder and Submissions controllers but am not sure what this is. Why are these strings being rendered whenever I try and render an instance in my view? I'm still new to Ruby so that explains why I haven't seen this.

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paypal_adaptive gem in Rails: Dynamic Receiver "Population" (Chained Payments)

- by Jmlevick

Note: I didn't find a better title for this O.o Hello, Humm... Look, what I want to do is to have a Rails app where a visitor can click a button/link to make a "special" chained payment using Paypal; Currently I have a Users registration form that has one field for the user to enter his/her paypal account email, and as I saw here: http://marker.to/XGg9MR it is possible to specify the primary reciever and the secondary ones by adding such info in a controller action when using the paypal_adaptive gem in a rails app. The thing is, I don't want to hard code the secondary reciever as I need to specify a different secondary reciever from time to time, (being specific my primary reciever will always be the same, but depending on what button/link the visitor clicks, the secondary one is going to change) and I want that secondary reciever email to be the paypal e-mail account from one of the registered users when the visitor clicks on their specific button/link... My question is: Is it possible to create such enviroment functionality in my app using the current implementation of the paypal_adaptive gem? Could someone point me in the right direction on how to accomplish such thing? I'm still learning rails and also I'm really new in the paypal handling universe with this framework! XD P.S. Thanks! :)

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1.8.x Ruby on Rails RESTful nested admin page and form_for problems

- by Loomer

So I am creating a website that I want to have an admin directory in rails 1.8.x and I'm struggling a bit to get the form_for to link to the right controller. I am trying to be RESTful. What I basically want is an admin page that has a summary of actions which can then administer sub models such as: /admin (a summary of events) /admin/sales (edit sales on the site) /admin/sales/0 (the normal RESTful stuff) I can't use namespaces since they were introduced in Rails 2.0 (production site that I don't want to mess with updating rails and all that). Anyway, what I have in the routes.rb is: map.resource :admin do |admin| admin.resources :sales end I am using the map.resource as a singleton as recommended by another site. The problem comes in when I try to use the form_for to link to the subresource RESTfully. If i do : form_for(:sales, @sale) it never links to the right controller no matter what I try. I have also tried: form_for [@admin, @sale] do |f| and that doe not work either (I am guessing since admin is a singleton which does not have a model, it's just a placeholder for the admin controller). Am I supposed to add a prefix or something? Or something into the sales controller to specify that it is a subcontroller to admin? Is there an easier way to do this without manually creating a bunch of routes? Thanks for any help.

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multiple models in Rails with a shared interface

- by dfondente

I'm not sure of the best structure for a particular situation in Rails. We have several types of workshops. The administration of the workshops is the same regardless of workshop type, so the data for the workshops is in a single model. We collect feedback from participants about the workshops, and the questionnaire is different for each type of workshop. I want to access the feedback about the workshop from the workshop model, but the class of the associated model will depend on the type of workshop. If I was doing this in something other than Rails, I would set up an abstract class for WorkshopFeedback, and then have subclasses for each type of workshop: WorkshopFeedbackOne, WorkshopFeedbackTwo, WorkshopFeedbackThree. I'm unsure how to best handle this with Rails. I currently have: class Workshop < ActiveRecord::Base has_many :workshop_feedbacks end class Feedback < ActiveRecord::Base belongs_to :workshop has_many :feedback_ones has_many :feedback_twos has_many :feedback_threes end class FeedbackOne < ActiveRecord::Base belongs_to :feedback end class FeedbackTwo < ActiveRecord::Base belongs_to :feedback end class FeedbackThree < ActiveRecord::Base belongs_to :feedback end This doesn't seem like to the cleanest way to access the feedback from the workshop model, as accessing the correct feedback will require logic investigating the Workshop type and then choosing, for instance, @workshop.feedback.feedback_one. Is there a better way to handle this situation? Would it be better to use a polymorphic association for feedback? Or maybe using a Module or Mixin for the shared Feedback interface? Note: I am avoiding using Single Table Inheritance here because the FeedbackOne, FeedbackTwo, FeedbackThree models do not share much common data, so I would end up with a large sparsely populated table with STI.

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