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• SEO Friendly URLs where the phrase used may change in Rails

  - by Newy

  Say I have http://www.mysite.com/I-Like-Cheeseburgers and I want that to point to Item with id 3. Sometime later, I change the name of the item, and now its http://www.mysite.com/I-Like-Hamburgers (and perhaps many more times). I want all these URLs to remain pointing to Item 3. Is it efficient to simply keep a table of [strings,item_ids] and do a lookup on this? Is there a better way?

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• Select-all checkboxes in a FORM_TAG

  - by Horace Ho

  In a form_tag, there is a list of 10 to 15 checkboxes: <%= check_box_tag 'vehicles[]', car.id %> How can I select-all (put a tick in every single) checkboxes by RJS? Thanks EDIT: Sorry I didn't make my question clear. What I meant to ask is how to add a "Select/Un-select All" link in the same page to toggle the checkboxes.

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• Rails 3 loading all models on startup

  - by janechii

  Hi all, I have a class method mixed in to all my models. the method gets called when the model class is evaluated. unfortunately (for me), this seems to be on-demand, whenever the model is needed in development env. how can have rails load all the models at start up? is this even advisable? class Foo < ActiveRecord::Base include Acl register_acl # i need this to be called for all models at start up end thank you!

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• how do I create a custom route in rails where I pass the id of an existing Model?

  - by Angela

  I created the following route: map.todo "todo/today", :controller => "todo", :action => "show_date" Originally, the 'show_date' action and associated view would display all the activities associated for that day for all the Campaigns. This ended up being very slow on the database...it would generate roughly 30 records but was still slow. So, I'm thinking of creating a partial that would first list the campaigns separately. If someone clicked on a link associated with campaign_id = 1, I want it to go to the following route: todo/today/campaign/1 Then I would like to know how to know that the '1' is the campaign_id in the controller and then just do its thing. The reason I want a distinct URL is so that I can cache this list. I have to keep going back to this and it's slow. NOTE: It's possibly the problem actually is that I've written the queries in a slow way and sqlite isn't representative of how it will be in production, in which case this work-around is unnecessary, but right now, I need a way to get back to the whole list quickly.

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• How to update attributes without valitation

  - by Brian Roisentul

  I've got a model with its validations, and I found out that I can't update an attribute without validating the object before. I already tried to add on => :create syntax at the end of each validation line, but I got the same results. My announcement model have the following validations: validates_presence_of :title validates_presence_of :description validates_presence_of :announcement_type_id validate :validates_publication_date validate :validates_start_date validate :validates_start_end_dates validate :validates_category validate :validates_province validates_length_of :title, :in => 6..255, :on => :save validates_length_of :subtitle, :in => 0..255, :on => :save validates_length_of :subtitle, :in => 0..255, :on => :save validates_length_of :place, :in => 0..50, :on => :save validates_numericality_of :vacants, :greater_than_or_equal_to => 0, :only_integer => true validates_numericality_of :price, :greater_than_or_equal_to => 0, :only_integer => true My rake task does the following: task :announcements_expiration => :environment do announcements = Announcement.expired announcements.each do |a| #Gets the user that owns the announcement user = User.find(a.user_id) puts a.title + '...' a.state = 'deactivated' if a.update_attributes(:state => a.state) puts 'state changed to deactivated' else a.errors.each do |e| puts e end end end This throws all the validation exceptions for that model, in the output. Does anybody how to update an attribute without validating the model?

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• Can you call compiled JRuby classes from java?

  - by John Baker

  So I came up with the general idea to write some code in JRuby, then access all the classes via Java. I have no idea if this is at all possible but I wanted to ask anyway. Lets say I have some JRuby code: class adder def addme return 22 end end If I compiled this with jrubyc is there any way I could then possibly do something like this in java: import adder; class anything { void testMethod() { adder a = new adder(); int x = a.addme(); } } After looking at it now it sort of makes me think that Java will have zero idea what sort of item test addme is going to return so that might not work. I don't know but I wanted to throw it out there anyway. Thanks

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• Longest item in array

  - by c00lryguy

  Is there an easier way than below to find the longest item in an array? arr = [ [0,1,2], [0,1,2,3], [0,1,2,3,4], [0,1,2,3] ] longest_row = [] @rows.each { |row| longest_row = row if row.length > longest_row.length } p longest_row # => [0,1,2,3,4]

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• paperclipt get error can't dump File when upload video in rails

  - by user3510728

  when i try to upload video using paperclipt, i get error message can't dump File? model video : class Video < ActiveRecord::Base has_attached_file :avatar, :storage => :s3, :styles => { :mp4 => { :geometry => "640x480", :format => 'mp4' }, :thumb => { :geometry => "300x300>", :format => 'jpg', :time => 5 } }, :processors => [:ffmpeg] validates_attachment_presence :avatar validates_attachment_content_type :avatar, :content_type => /video/, :message => "Video not supported" end when i try to create video, im get this error?

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• Validating "Visa Debit" cards in ActiveMerchant

  - by robw

  How can I correctly validate a Visa Debit card in ActiveMerchant? At the moment, the card fails to validate despite it being a valid card number. I have tried using :visa, :visa_debit and nil card types.

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• Stable/repeatable random sort (MySQL, Rails)

  - by Matt Rogish

  I'd like to paginate through a randomly sorted list of ActiveRecord models (rows from MySQL database). However, this randomization needs to persist on a per-session basis, so that other people that visit the website also receive a random, paginate-able list of records. Let's say there are enough entities (tens of thousands) that storing the randomly sorted ID values in either the session or a cookie is too large, so I must temporarily persist it in some other way (MySQL, file, etc.). Initially I thought I could create a function based on the session ID and the page ID (returning the object IDs for that page) however since the object ID values in MySQL are not sequential (there are gaps), that seemed to fall apart as I was poking at it. The nice thing is that it would require no/minimal storage but the downsides are that it is likely pretty complex to implement and probably CPU intensive. My feeling is I should create an intersection table, something like: random_sorts( sort_id, created_at, user_id NULL if guest) random_sort_items( sort_id, item_id, position ) And then simply store the 'sort_id' in the session. Then, I can paginate the random_sorts WHERE sort_id = n ORDER BY position LIMIT... as usual. Of course, I'd have to put some sort of a reaper in there to remove them after some period of inactivity (based on random_sorts.created_at). Unfortunately, I'd have to invalidate the sort as new objects were created (and/or old objects being removed, although deletion is very rare). And, as load increases the size/performance of this table (even properly indexed) drops. It seems like this ought to be a solved problem but I can't find any rails plugins that do this... Any ideas? Thanks!!

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• Namespace with index action in Rails

  - by yuval

  I have an admin controller located inside /controllers/admin/admin_controller.rb I also have a pages controller located inside /controllers/admin/pages_controller.rb In my routes.rb file, I have the following: map.namespace :admin do |admin| admin.resources :pages end When the user goes to localhost:3000/admin, I'd like the user to see a page with a link to /admin/pages (Pages CRUD) and to / (To go back home). Since I am using a namespace, I cannot have an index action for /admin. How would I get this done and still have my controllers located inside my /controllers/admin folder (rather than using admin as a map.resources component and a has_many association to pages). Please note I am only interested in the show action of admin. Thank you!

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• Headers set on embedding

  - by mschoening

  Lets say I have a URL (http://www.example.com/something). Is the following scenario somehow possible? A) The user visits the URL directly and a standard page with markup, js, etc. is shown. B) The user embeds the same URL in an image tag and the URL is served only as an image.

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• How can I make an aggregated property support ActiveRecord::Dirty semantics?

  - by Eric

  I have an aggregated attribute which I want to be able ask about its _changed? ness, etc. composed_of :range, :class_name => 'Range', :mapping => [ %w(range_begin begin), %w(range_end end)], :allow_nil => true If I use the aggregation: foo.range = 1..10 This is what I get: foo.range # => 1..10 foo.range_changed? # NoMethodError foo.range_was # ditto foo.changed # ['range_begin', 'range_end'] So basically, I'm not getting ActiveRecord::Dirty semanitcs on aggregated attributes. Is there any way to do that? I'm not having a lot of luck with alias_attribute_with_dirty, etc.

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• Delayed Jobs is not finding Records and failing..

  - by Trip

  In my app, delayed jobs isn't running automatically on my server anymore. It used to.. When I manually ssh in, and perform rake jobs:work I return this : * Starting job worker host:ip-(censored) pid:21458 * [Worker(host:ip-(censored) pid:21458)] acquired lock on PhotoJob * [JOB] host:ip-(censored) pid:21458 failed with ActiveRecord::RecordNotFound: Couldn't find Photo with ID=9237 - 4 failed attempts This returns roughly 20 times over for what I think is several jobs. Then I get a few of these: [Worker(host:ip-(censored) pid:21458)] failed to acquire exclusive lock for PhotoJob And then finally one of these : 12 jobs processed at 73.6807 j/s, 12 failed ... Any ideas what I should be mulling over? Thanks so much!

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• Ajax using Rails

  - by Steve

  Hi, I have a favourite and un-favourite functionality in my application and I am using jQuery. This functionality works partially. The page gets loaded, and when I click the 'favourite' button(it is inside add_favourite_div element), it sends a XHR request and the post is set as favourite. Then a new div called "remove_favourite_div" replaces its place.Now when I click the remove favourite(which is part of remove_favourite_div), it sends a normal http request inside of xhr. The structure when the page gets loaded first time <div id="favourite"> <div id="add_favourite_div"> <form method="post" id="add_favourite" action="/viewpost/add_favourite"> <div style="margin: 0pt; padding: 0pt; display: inline;"> <input type="hidden" value="w873BgYHLxQmadUalzMRUC+1ql4AtP3U7f78dT8x9ho=" name="authenticity_token"> </div> <input type="hidden" value="3" name="Favourite[post_id]" id="Favourite_place_id"> <input type="hidden" value="2" name="Favourite[user_id]" id="Favourite_user_id"> <input type="submit" value="Favourite" name="commit"><br> </form> </div> </div> DOM after clicking on the unfavourite button <div id="favourite"> <div id="remove_favourite_div"> <form method="post" id="remove_favourite" action="/viewpost/remove_favourite"> <div style="margin: 0pt; padding: 0pt; display: inline;"> <input type="hidden" value="w873BgYHLxQmadUalzMRUC+1ql4AtP3U7f78dT8x9ho=" name="authenticity_token"> </div> <input type="hidden" value="3" name="Favourite[post_id]" id="Favourite_place_id"> <input type="hidden" value="2" name="Favourite[user_id]" id="Favourite_user_id"> <input type="submit" value="UnFavourite" name="commit"><br> </form> </div> </div> In my application.js, I have two functions to trigger the xhr request $("#add_favourite").submit(function(){ alert("add favourite"); action = $(this).attr("action") $.post(action,$(this).serialize(),null,"script"); return false; }); $("#remove_favourite").submit(function(){ alert("remove favourite"); action = $(this).attr("action"); $.post(action,$(this).serialize(),null,"script"); return false; }); Here, when the post is initially not a favourite, favourite button is displayed and when i clicked on the button, $("#add_favourite").submit gets called and unfavourite form is displayed correctly, but now when I click on the un-favourite button, $("#remove_favourite").submit does not get called. The whole scenario is true in both ways, I mean favourite-Unfavourite and Unfavourite-favourite Can someone please help me to solve this Thanks

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• What can be inside a class that derive from OmniAuth?

  - by Richard77

  I have the following class class Identity < OmniAuth:: Identity:: Models:: ActiveRecord attr_accessible :email, :name, :password_digest, :password, :password_confirmation end I wonder if the above properties are the only ones allowed for a class that derive from a OmniAuth. I wish I could add some more like FirstName, LastName, age, gender, and so on. Do I need to create an other model for those properties or can I just add them to the Identity model? Thanks for helping.

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• Setting new class variables inside a module

  - by Sean McCleary

  I have a plugin I have been working on that adds publishing to ActiveRecord classes. I extend my classes with my publisher like so: class Note < ActiveRecord::Base # ... publishable :related_attributes => [:taggings] end My publisher is structured like: module Publisher def self.included(base) base.send(:extend, ClassMethods) @@publishing_options = [] # does not seem to be available end module ClassMethods def publishable options={} include InstanceMethods @@publishing_options = options # does not work as class_variable_set is a private method # self.class_variable_set(:@@publishing_options, options) # results in: uninitialized class variable @@publishing_options in Publisher::ClassMethods puts "@@publishing_options: #{@@publishing_options.inspect}" # ... end # ... end module InstanceMethods # results in: uninitialized class variable @@publishing_options in Publisher::InstanceMethods def related_attributes @@publishing_options[:related_attributes] end # ... end end Any ideas on how to pass options to publishable and have them available as a class variable?

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• Jquery (non-gem) plugin won't work in my rails 3.2 app

  - by jfdimark

  I'm trying to equalize columns in my rails 3.2 app, and while there may be a better way to do it then my current attempt, after hours of trying to make it work I'd like to see if anyone can point out specifically why this jQuery plugin (which isn't a gem) is not working. I'm not getting any errors in the developer console, so it's hard to pin point. Here's the relevant code: The index view, where I've followed the plugin's instructions: div id="column-group"> <div class="equalize span5 offset1 UserProfile"> <% if user_signed_in? %> <h3>Hello <%= current_user.name %>!</h3> </div> <div class="equalize span5 MemberDisplay"> My application.js file, where I've also included the specific js code, so it would definitely be picked up by the application: //= require jquery //= require jquery_ujs //= require bootstrap //= require equalize_column_heights //= require_tree . $(document).ready(function() { $("#column-group").equalize_column_heights("equalize"); }); The jQuery plugin code, which is saved in my vendor/assets/javascripts folder: (function ($) { $.fn.equalize_column_heights = function (equalize_class) { var tallest_column=0; parent_id = "column-group" + $(this).attr("id") + " ." + equalize_class; $(parent_id).each(function(index, value) { if (tallest_column < $(this).height()){ tallest_column = $(this).height(); } }); $(parent_id).each(function(index, value) { $(this).css({'min-height': tallest_column}); }); } }(jQuery)); I've read all the rails guides documentation on the asset pipeline and all the relevant jQuery-rails3 questions on SO, but after several hours, I just can't seem to figure this one out. If anyone can point to other tutorials on how to get non-gem jQuery plugins to work in a Rails 3.2 app then I'd be glad to take a look!

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• how to save related models with non-null foreign key

  - by Fortress

  I have a model called user which has_one email. I put the foreign key (NOT NULL) inside users table. Now I'm trying to save it in the following way: @email = Email.new(params[:email]) @email.user = User.new(params[:user]) @email.save This raises a db exception, because the foreign key constraint is not met (NULL is inserted into email_id). How can I elegantly solve this or is my data modeling wrong?

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• rake test and test_structure.sql

  - by korinthe

  First of all, I have to run "rake RAILS_ENV=test ..." to get the test suites to hit my test DB. Annoying but ok to live with. However when I do so, I get a long stream of errors like so: > rake RAILS_ENV=test -I test test:units psql:/path/to/project/db/test_structure.sql:33: ERROR: function "armor" already exists with same argument types [and many more] It looks like some DB definitions are getting unnecessarily reloaded. I can't find any mention of this on Google, so I was wondering whether others have seen this? I am using a PostgreSQL database with the following in my environment.rb: config.active_record.schema_format = :sql and using Rails 2.3.5 with rake 0.8.7.

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• Using before_create in Rails to normalize a many to many table

  - by weotch

  I am working on a pretty standard tagging implementation for a table of recipes. There is a many to many relationship between recipes and tags so the tags table will be normalized. Here are my models: class Recipe < ActiveRecord::Base has_many :tag_joins, :as => :parent has_many :tags, :through => :tag_joins end class TagJoin < ActiveRecord::Base belongs_to :parent, :polymorphic => true belongs_to :tag, :counter_cache => :usage_count end class Tag < ActiveRecord::Base has_many :tag_joins, :as => :parent has_many :recipes, :through => :tag_joins, :source => :parent , :source_type => 'Recipe' before_create :normalizeTable def normalizeTable t = Tag.find_by_name(self.name) if (t) j = TagJoin.new j.parent_type = self.tag_joins.parent_type j.parent_id = self.tag_joins.parent_id j.tag_id = t.id return false end end end The last bit, the before_create callback, is what I'm trying to get working. My goal is if there is an attempt to create a new tag with the same name as one already in the table, only a single row in the join table is produced, using the existing row in tags. Currently the code dies with: undefined method `parent_type' for #<Class:0x102f5ce38> Any suggestions?

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• Can Capistrano set variables based on a role?

  - by conickal

  I am trying to use Capistrano to deploy to two different roles, using Bundler on both, however the Bundler command and flags will be different. Is it possible to set variables that are specific to a role? Either something like: set :bundle_flags, "--deployment --quiet", :role => "web" or: role :web do set :bundler_cmd, "--deployment --quiet" end Neither of those two options work, of course. Is there a way to accomplish this, or something like it?

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• resend confirm instructions via devise

  - by Paul 'Whippet' McGuane

  what im trying to achieve is that when an admin views a list of members, they can click a link to resend the instructions on how to confirm that members accounts. this is the code im using to try and achieve this = link_to 'Resend Confirmation', confirmation_path(:user => {:email => user.email}), :remote => :true im hoping that this would allow me to pass the users email through to the link have it then sent to that user though the issue im getting is Could not find a valid mapping for {:user=>{:email=>"[email protected]"}}

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• Model self referential collections in Rails

  - by Najitaka

  I have written an application for an online clothing store in Rails 2.3.5. I want to show related Products when a customer views the Product Detail page. For example, if the customer views the detail page for a suit, I'd like to display the accessory products that match the dress such as a vest, shoes, and belt. I have named the related products an Ensemble. However, the vest, shoes, and belts are also Products which is what has me struggling. I have it working as follows but I know it's not the Rails way. I have a Products table for all of the products. Not important here but I also have a ProductDetails table. I have an Ensembles table that has the following columns: product_id - the main or origination product, the one displayed on the detail page outfit_id - the related or accessory product In setting up the data, on the Products list, for each Product I have an Ensemble link. This link takes you to the index action in the Ensembles controller. Using the id from the "main" Product, I find all of the associated Ensemble rows by product_id or I create a new ensemble and assign the id from the main product as the product_id. I'd like to just be able to do @product.related_products to get an Ensemble collection. Also on the index page I list the columns of the main product so the user can be sure their main product was the one they selected from the list. I also have a select list of the other products, with an Add to Ensemble action. Finally on the same index page, I have a table that displays the products that are already in the ensemble and in that list each row has a destroy link to remove a particular product from the ensemble. It would be nice if given a single Ensemble row @ensemble I could do @ensemble.product to get the Product related to the outfit_id of the ensemble row. I've got it working without associations but I have to run queries in the controller to build my own @product, @ensemble, and @ensembles collections. Also the only way I found to destroy an ensemble row is by Ensemble.connection.delete(sql to delete), simple @ensemble.destroy doesn't work. Anyone know how I would set up the associations or have a link to a site explaining a similar setup. None of the examples I found use the same table. They have A related to B through C. I want A related to other A through B.

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• How to copy a file using Paperclip

  - by CalebHC

  Does anyone know of a way to copy files with Paperclip using S3 for storage? Before I try to write my own, I just wanted to make sure there wasn't already a way to do this. Speaking of copying, is there an easier way of copying a whole model including all of its has_many relationships? Sorry for the second question but it kind of fits! :) Thanks

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