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• One way Has-Many-Through

  - by Hock

  Hello, I have a Category, a Subcategory and a Product model. I have: Category has_many Subcategories Subcategory has_many Products Subcategory belongs_to Category Product belongs_to Subcategory Is there a way to have something like Category has_many Projects through Subcategories ? The 'normal' rails way wouldn't work because "subcategory" doesn't belongs to product so product does not have a subcategory_id field. Instead, I need the query to be something like SELECT * FROM products WHERE id IN category.subcategory_ids Is there a way to do that? Thanks, Nicolás Hock Isaza

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• Where to put constants in Rails

  - by Sam

  I have a few constants which are arrays that I don't want to create db's for but I don't know where to store the constants without getting errors. For example CONTAINER_SIZES = [["20 foot"],["40 foot"]] Where can I store this so all models and controller have access to this?

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• Using colon syntax and variables in Sass

  - by corroded

  I am still using the old colon syntax (I prefer it more than the bracket syntax) and this particular code: a.button-link +box($main-color) +border-radius(5px) :background :color $main-color :color #fff :padding 5px generates a warning like so: DEPRECATION WARNING: On line 12, character 3 of '/Users/eumir/rails_apps/dxconnect/app/ stylesheets/partials/utilities/_link-styles.sass' Setting properties with = has been deprecated and will be removed in version 3.2. Use "background: $main-color" instead. I tried that but my background color still doesn't show up. Any help on this please? Thanks!

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• how to remove html element's style attribute using Hpricot?

  - by shewei

  like this: <p style="font-size: 12pt;"> Hello world <span style="font-weight: bold;">just do it</span> </p> I want to remove every element's "style" attribute. I want the result like this: <p>Hello world <span>just do it</span></p> how to do this using hpricot? thanks.

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• Sanitizing CSS in Rails

  - by Erik

  Hello! I want to allow the users of a web app that I'm building to write their own CSS in order to customize their profile page. However I am aware of this opening up for many security risks, i e background: url('javascript:alert("Got your cookies! " + document.cookies'). Hence I am looking for a solution to sanitize the CSS while still allowing as much CSS functionality as possible for my users. So my questions if anyone anyone knows of a gem or a plugin to handles this? I've googled my brains out already so any tips would be really appreciated!

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• Rails Devise: How to access sign up page after signed in?

  - by Junior rails programmer

  hi All, I am new with rails and i am using "devise" gem for authentication purposes. At first i add a new user through default sign up page (E.g./users/sign_up) Then, i made "sign_up" page only available to signed_in users by following instructions from Devise before filter that prevents access to "new_user_registration_path" unless user is signed-in Now, after sign in process when i try open sign up page it always directs me to root_path! How can i access sign up page? My "roots.rb" file as follows: Example::Application.routes.draw do devise_for :users, :controllers => { :registrations => 'registrations'} resources :companies resources :orders resources :customers root :to => "welcome#index" end Thank you all!

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• Roles authentication with Rails 3 and Devise.

  - by Oluf Nielsen

  Hi, first happy new year, may you make the best applications in 2011! So to my question, i have used devise ever since i got over to Rails 3, that was around the first or second beta, and now i also needs some Roles. So i searched the net, and i searched! And what i found was that CanCan should be the best solution. But i'm unsure if CanCan can manage my needs, like i want a forum moderator who can edit/destroy the topic, but the user who created the topic should also be able to edit, so how can i do that? Cheers, Oluf.

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• Is there an API for listing queues and exchanges on RabbitMQ?

  - by parsenome

  I've looked quite a bit, but I haven't been able to find a good programmatic way to list the queues on a RabbitMQ server. This is important because I need to clean up my queues and exchanges when I'm done with them. I don't always have a good "done" event that can be used to trigger a cleanup, so I'd like to do it with more of a garbage collection model. If I can list the queues, I can verify that the objects that they're related to shouldn't be producing more entries and clean them up. I know I can use rabbitmqctl to do it, but that needs elevated privileges. Since I haven't been able to find a way to list the queues programmatically, I've been keeping a list of names in the database. That works, but it's ugly.

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• Does to_json require parameters? what about within rails?

  - by Harry Wood

  Does to_json require parameters? what about within rails? I started getting the error "wrong number of arguments (0 for 1)" when doing myhash.to_json Unfortunately I'm not sure when this error started happening, but I guess it relates to some versions of either rails or the json gem. I suppose my code (in a rails controller) is using the ActiveSupport::JSON version of to_json, rather than the to_josn method supported by the json gem. ActiveSupport::JSON vs JSON In environment.rb I have RAILS_GEM_VERSION = '2.3.2' and also config.gem "json", :version=> '1.1.7' It's just a simple hash structure containing primitives which I want to convert in my controller, and it was working, but now I can't seem to run to_json without passing parameters.

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• Why does Rails screw up timezones when I am editing a resource?

  - by DJTripleThreat

  Steps to produce this: prompt>rails test_app prompt>cd test_app prompt>script/generate scaffold date_test my_date:datetime prompt>rake db:migrate now edit your app/views/date_tests/edit.html.erb: <h1>Editing date_test</h1> <% form_for(@date_test) do |f| %> <%= f.error_messages %> <p> RIGHT!<br/> <%= text_field_tag @date_test, f.object.my_date %> </p> <p> WRONG!<br /> <%= f.text_field :my_date %> </p> <p> <%= f.submit 'Update' %> </p> <% end %> <%= link_to 'Show', @date_test %> | <%= link_to 'Back', date_tests_path %> now edit your config/environment.rb: #add this config.time_zone = 'Central Time (US & Canada)' This recreates the problem I am having in my actual app. The problem with my app is that I'm storing a date in a hidden field and rendering a "user friendly" version. Creating a resource works fine but as soon as I try to edit it the time changes (it adds the difference between my current time zone configuration and UTC). go to http://localhost:3000/date_tests/new and save the time then go to reedit it and you will have two different representations of the date/time one which will save incorrectly and the other that will.

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• Building a wiki like data model in rails question.

  - by lillq

  I have a data model in which I would like to have an item that has a description that can be edited. I would like to also keep track of all edits to the item. I am running into issues with my current strategy, which is: class Item < ActiveRecord::Base has_one :current_edit, :class_name => "Edit", :foreign_key => "current_edit_id" has_many :edits end class Edit < ActiveRecord::Base belongs_to :item end Can the Item have multiple associations to the same class like this? I was thinking that I should switch to keeping track of the edit version in the Edit object and then just sorting the has_many relationship base on this version.

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• rails expiring cache

  - by ash34

  Hi, I entered some products data into a table using a migration. I need to expire the page and fragment cache when I update, add, delete products from this table. I created a sweeper for this. class ProductSweeper < ActionController::Caching::Sweeper observe Product def after_create expire_cache end def after_save expire_cache end def after_update expire_cache end def after_destroy expire_cache end private def expire_cache expire_page(:controller => 'ProductsController', :action => 'index') expire_fragment 'listed_products' end end Then in script/console I update the product name and saved. When I reload my app in the browser it still gives me a cache hit. Cached fragment hit: views/listed_products (0.2ms) Can someone tell me how to expire this cache. I will not be adding, updating, deleting products through a controller action. thanks, ash

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• @user.posts.where('status = ?', :unfinished).all returns []

  - by Cheng

  By @user.posts, I can see there is a post with :unfinished status. But @user.posts.where('status = ?', :unfinished).all returns an empty array. I've tried to invoke @user.reload first, but it doesn't resolve the problem. (rdb:568) @user.posts [#<Post id: 1, content: "hehe", user_id: 1, created_at: "2010-04-03 06:16:47", updated_at: "2010-04-03 06:16:47", status: "--- :unfinished\n">] (rdb:568) @user.posts.where('status = ?', :unfinished).all []

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• Adding a CSS class to the options tag inside a select wrapper w/ Rails

  - by Christian

  What if I need to add a class to the options tag? testme1 I haven't been able to do this. This is what I have <%= select(:user, :goalstext, Bodytarget.all.collect {|b| [ b.name, b.id ] }, {"class", "test"}, :class = "selected", :class = "selected") %

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• Rails (pagination and tags)

  - by Vitaly

  Hey, I stumbled upon a problem of how to mix both acts_as_taggable (on steroids) and will_paginate gems. What I found on this problem is this: http://www.mckinneystation.com/2007/08/20/pagination-with-acts_as_taggable_on_steroids-acts_as_ferret-and-will_paginate/ But it's dated of 2007, may be there's something more recent? And also could you explain in details what should I do to make that fix work?

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• Nokogiri changing custom elements

  - by dagda1

  Hi, I have sample html that I have marked up with some special tags that will be used by a different program, an example of the html is below. You should note the <START:organization>..<END> elements. <html> <head/> <body> <ul> <li> <START:organization> Advanced Integrated Pest Management <END> </li> <li> <START:organization> American Bakers Association <END> </li> </ul> </body> </html> I wanted to use nokogiri to preprocess the html to easily remove irrelevant tags like <script>. I created the following extension to the nokogiri document class: module Nokogiri module HTML class Document def prepare_html xpath("//script").remove to_html.remove_new_lines end end end end The problem is that nokogiri is changing the <START:organization> element to <organization>. Is there anyway that I can preserve the htnl to maintain my custom markup tags? Thanks Paul

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• Can not access response.body inside after filter block in Sinatra 1.0

  - by Petr Vostrel

  I'm struggling with a strange issue. According to http://github.com/sinatra/sinatra (secion Filters) a response object is available in after filter blocks in Sinatra 1.0. However the response.status is correctly accessible, I can not see non-empty response.body from my routes inside after filter. I have this rackup file: config.ru require 'app' run TestApp Then Sinatra 1.0.b gem installed using: gem install --pre sinatra And this is my tiny app with a single route: app.rb require 'rubygems' require 'sinatra/base' class TestApp < Sinatra::Base set :root, File.dirname(__FILE__) get '/test' do 'Some response' end after do halt 500 if response.empty? # used 500 just for illustation end end And now, I would like to access the response inside the after filter. When I run this app and access /test URL, I got a 500 response as if the response is empty, but the response clearly is 'Some response'. Along with my request to /test, a separate request to /favicon.ico is issued by the browser and that returns 404 as there is no route nor a static file. But I would expect the 500 status to be returned as the response should be empty. In console, I can see that within the after filter, the response to /favicon.ico is something like 'Not found' and response to /test really is empty even though there is response returned by the route. What do I miss?

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• Is it possible to group validation?

  - by lambdabutz

  I am using a lot of my own validation methods to compare the data from one association to the other. I've noticed that I'm constantly checking that my associations aren't nil before trying to call anything on them, but I am also validating their presence, and so I feel that my nil checks are redundant. Here's an example: class House < ActiveRecord::Base has_one :enterance, :class => Door has_one :exit, :class => Door validates_presence_of :enterance, :exit validate :not_a_fire_hazard def not_a_fire_hazard if enterance && exit && enterance.location != exit.location errors.add_to_base('If there is a fire you will most likely die') return false end end end I feel like I am repeating myself by checking the existence of enterance and exit within my own validation. Is there a more "The Rails Way" to do this?

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• HAML-like syntax for non-HTML documents?

  - by Peter

  I love using HAML for HTML documents. It has clean syntax that's much more attractive than ERB. It works perfectly for HTML documents. What about for non-HTML? Such as, for example, an email or text document with certain automatically-substituted components? I've been falling back to ERB, but don't like the heavy syntax compared to HAML. Is there any way to use HAML for ordinary documents without having divs and html elements appear when % and . start a line? Or is there some alternative to both HAML and ERB that I should investigate?

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• Resque: Slow worker startup and Forking

  - by David John

  I'm currently moving my application from a Linode setup to EC2. Redis is currently installed on a remote instance with various worker instances interacting with the queue. Thats all going fantastic. My problem is with the amount of time it takes for a worker to be 'instantiated' and slow forking. Starting a worker will usually take between 30 seconds and a minute(from god.rb starting the worker rake task and the worker actively starting work on the queue). I could live with that, but I've not experienced such a wait time on my current Linode production box so I believe its one of my symptoms to a bigger problem. Next issue is that jobs that took a second or less in my previous environment now seem to take about 5 to 10 times longer.. I'm assuming this must be some sort of issue with my Ubuntu install on EC2? One notable difference is that I'm running REE 1.8.7-2010.01 in my new setup, and REE 1.8.6 on the old Linode boxes. Anyone else experienced these issues?

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• Rails routes matching query parameters

  - by Harry Wood

  Rails routes are great for matching RESTful style '/' separated bits of a URL, but can I match query parameters in a map.connect config. I want different controllers/actions to be invoked depending on the presence of a parameter after the '?'. I was trying something like this... map.connect "api/my/path?apple=:applecode", :controller = 'apples_controller', :action = 'my_action' map.connect "api/my/path?banana=:bananacode", :controller = 'bananas_controller', :action = 'my_action' For routing purposes I don't care about the value of the parameter, as long as it is available to the controller in the 'params' hash

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• Yet another Rails routing question

  - by danhere

  I can't seem to grasp the Rails routing just yet. I want to be able to link the site to, for example, ...com/store/xbox360/Mass Effect 2 (which is /store(my controller)/:system/:title). I have the database entries that include the :system and :title variables (?). How would I route these to show up and filter these entries? Or is this something I need to set up in the controller? I'm lost. Thanks so much for your help.

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• routing problem with startpage in rails3

  - by DannyRe

  Hey, I deleted the Index.html in my /public/ folder. I added a "application" folder in my views. In it I put a new index.html.erb. This I want to be my startpage/homepage. In my new "index.html.erb" I set: link_to 'sign in', {:controller => 'devise/sessions', :action => 'new'} But it redirects me to the "application#index". I set root :to => "application#index How can I set this to route it to "posts#index" after I sign in, for example? Is there a chance to use .erb oder .haml in my /public/index.html? Many thanks!!

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• Body class for controller in Rails app.

  - by Vincent

  Currently I have this in my layout: <body class="<%= controller.controller_name %>"> I want to add an additional class that will be the same for all actions in any controller where it's set, something like: class SomeController < ApplicationController body_class 'page' ... end class AnotherController < ApplicationController body_class 'page' ... end Which will result in: <body class="some page"> <body class="another page"> What would be the easiest way to achieve this? Can I use controller class variables for this?

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• Rails autlogic : How to make Levels?

  - by Oluf Nielsen

  Hello, i followed this tutorial fo setting Autlogic up properly. So, my site needs a form of level, like "Admin", "Moderator", "User", "Guest". So Admins can do everything, where Moderators may not can make site changes. And Users can't destroy, Update or Create. I've have googled a bit.. But nothing found, so i thought you guys might can help me out? Thank you.

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