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• Rails: Multi-Step New User Signup Form (FSM?)

  - by neezer

  I've read the "Create Multi-Step Wizard" in Advanced Rails Recipes. I've also read and re-read the documentation for the updated FSM I'm using called Workflow, and looked here and here. The Advanced Rails Recipe focuses on records (quizzes) that already exist, and doesn't cover creating new ones. The Workflow docs don't cover any code for controllers or views, so I've no idea what to do with all this model magic, and the last two links barely touch on implementation either. From the aforementioned resources, I have a good understanding of what a FSM in Rails is and how to play with it in the console or IRB, but I've got very little direction or understanding how to implement one into my Rails app. What I would like is this: a simple, multi-step user signup process. Step 1: User enters in their critical details (with validations). Step 2: User enters in their search criteria, for their profile (with validations). Step 3: User agrees to the Terms of Service (with validations). Step 4: User is greeted by a confirmation page, including a link that takes them to their newly created account. I'd also like full navigation between the steps and full capture (saves to the database) with each transition. Can someone please give me a clear implementation of something similar to this? I would LOVE an example app that includes a multi-step signup process where I can look at the code (FULL source code--models AND controllers and views) under the hood, but I've been unable to find anything like that. Any guidance would be appreciated! EDIT: Please help make this a Railscast! Ryan B. (a.k.a. Superman), if you're reading this, we need you! http://feedback.railscasts.com/forums/77-episode-suggestions/suggestions/35553-multi-step-forms-and-wizards

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• Redirecting from an update action to the referrer of the edit

  - by Mark Westling

  My Rails 2.3 application has a User model and the usual controller actions. The edit form can be reached two ways: when a user edits his own profile from the home page, or when an admin user edits someone else's profile from users collection. What I'd like to do is have the update action redirect back to the referred of the edit action, not the update action. If I do a simple redirect_to(:back) within update, it goes back to the edit form -- not good. One solution is to forget entirely about referrers and redirect based on the current_user and the updated user: if they're the same, go back to the home page, else go to the users collection page. This will break if I ever add a third path to the edit form. It's doubtful I'll ever do this but I'd prefer a solution that's not so brittle. Another solution is to store the referrer of edit form in a hidden field and then redirect to this value from inside the update action. This doesn't feel quite right, though I can't explain why. Are there any better approaches? Or, should I stop worrying and go with one of the two I've mentioned?

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• Active Record two belongs_to calls to the same model

  - by ethyreal

  In linking a sports event to two teams, at first this seemed to make since: events - id:integer - integer:home_team_id - integer:away_team_id teams - integer:id - string:name However I am troubled by how I would link that up in the active record model: class Event belongs_to :home_team, :class_name => 'Team', :foreign_key => "home_team_id" belongs_to :away_team, :class_name => 'Team', :foreign_key => "away_team_id" end Is that the best solution? In an answer to a similar question I was pointed to single table inheritance, and then later found polymorphic associations. Neither of which seemed to fit this association. Perhaps I am looking at this wrong, but I see no need to subclass a team into home and away teams since the distinction is only in where the game is played. I thought also about a has_many through association but that seems two much as I will only ever need two teams, but those two teams don't belong to any one event. event_teams - integer:event_id - integer:team_id - boolean:is_home Is there a cleaner more semantic way for making these associations in active record? Thanks

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• Rails creating a new session every page view

  - by danhere

  Hi everyone, I'm following the Agile RoR book somewhat to apply it to a project for school. It's going good until I get to sessions. I continually get Authenticity Invalid Tokens and when I look at my sessions table in the database, there's a new session being created every time I refresh the page. Is that right or is something messed up? Thanks.

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• How to access nested params

  - by Flexo

  I would like to get some nested params. I have an Order that has many Items and these Items each have a Type. i would like to get the type_id parameter.

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• How do we know if a query is cache or retrieved from database?

  - by Hadi

  For example: class Product has_many :sales_orders def total_items_deliverable self.sales_orders.each { |so| #sum the total } #give back the value end end class SalesOrder def self.deliverable # return array of sales_orders that are deliverable to customer end end SalesOrder.deliverable #give all sales_orders that are deliverable to customer pa = Product.find(1) pa.sales_orders.deliverable #give all sales_orders whose product_id is 1 and deliverable to customer pa.total_so_deliverable The very point that i'm going to ask is: how many times SalesOrder.deliverable is actually computed, from point 1, 3, and 4, They are computed 3 times that means 3 times access to database so having total_so_deliverable is promoting a fat model, but more database access. Alternatively (in view) i could iterate while displaying the content, so i ends up only accessing the database 2 times instead of 3 times. Any win win solution / best practice to this kind of problem ?

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• Associating Models with Polymorphic

  - by Josh Crowder

  I am trying to associate Contacts with Classes but as two different types. Current_classes and Interested_classes. I know I need to enable polymorphic but I am not sure as to where it needs to be enabled. This is what I have at the moment class CreateClasses < ActiveRecord::Migration def self.up create_table :classes do |t| t.string :class_type t.string :class_name t.string :date t.timestamps end end def self.down drop_table :classes end end class CreateContactsInterestedClassesJoin < ActiveRecord::Migration def self.up create_table 'contacts_interested_classes', :id => false do |t| t.column 'class_id', :integer t.column 'contact_id', :integer end end def self.down drop_table 'contacts_interested_classes' end end class CreateContactsCurrentClassesJoin < ActiveRecord::Migration def self.up create_table 'contacts_current_classes', :id => false do |t| t.column 'class_id', :integer t.column 'contact_id', :integer end end def self.down drop_table 'contacts_current_classes' end end And then inside of my Contacts Model I want to have something like this. class Contact < ActiveRecord::Base has_and_belongs_to_many :classes, :join_table => "contacts_interested_classes", :foreign_key => "class_id" :as => 'interested_classes' has_and_belongs_to_many :classes, :join_table => "contacts_current_classes", :foreign_key => "class_id" :as => 'current_classes' end What am I doing wrong?

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• Best way to create a preview functionality in rails

  - by slythic

  Hi all, I'm looking to implement a preview functionality in my posts scaffold. All I need to do is allow a user to enter information in the new view (/posts/new) and then replace the submit button with a preview button. Once the preview button is clicked, the user is routed to the preview page (probably /posts/new/preview). If the user wants to make a change they would click 'go back' or if they are happy with the post they can then submit the post. I found this article (http://eyedeal.team88.org/node/105) but it seems dated. Any ideas on what the best approach for this would be? Many thanks, Tony

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• [Rails] Where to put this code?

  - by user305270

  [Rails] Where to put this code? I have a user1 and when another registered user2 sees the profile of user1, has some buttons on it: ['add as friend', 'give me your number', 'give me your email', 'ask her out', 'view photos']. The 1,2,3,4 are POST, with AJAX. Now, i have to make a new controller named 'ProfileActionsController' or i should put this code in the 'UsersController'? or maybe a another posiibility? thanks ;)

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• Distribute CouchDB as part of a Rails app?

  - by AaronThomson

  I am working on a Rails project and the Architect has asked me to investigate bundling CouchDB into to application so that it can be deployed by Capistrano across multiple platforms and managed by Rake. My expectation was that I could set up the Erlang VM on the various environments and then distribute the CouchDB application with Capistrano. However I can't find any option to download CouchDB without the Erlang runtime. I can, however see an option to build CouchDB from source which I assume is platform dependent. I am new to Erlang and CouchBD, am I missing something? Is there a way to bundle CouchDB into a Rails app and distribute it across multiple platforms?

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• Problem accessing variable in a nested form partial

  - by brad

  I have a nested form in a rails view that is called like this <% f.fields_for :invoice_item_numbers do |item_no_form| %> <%= render 'invoice_item_number', :f => item_no_form %> <% end %> and the partial (_invoice_item_number.html.erb) looks like this <div class='invoice_item_numbers'> <% if f.object.new_record? %> <li><%= f.label :item_number %><%= f.text_field :item_number %> <%= link_to_function "remove", "$(this).parent().remove()", :class => 'remove_link' %></li> <% else %> <li class="inline"><%= f.label :item_number %><%= f.text_field :item_number %> </li><li class="inline"><%= f.label :description %><%= invoice_item_number.description %></li><li><%= f.label :amount %><%= f.text_field :amount %> <%= f.check_box '_destroy', :class => 'remove_checkbox' %> <%= f.label '_destroy', 'remove', :class => 'remove_label' %></li> <% end %> </div> This fails with the error message undefined method `description' for nil:NilClass Why does invoice_item_number return a nil object in this partial? It is obviously being defined somehow because if I change it to something else (e.g. item_number.description then the error message becomes undefined local variable or methoditem_number' for #instead. The invoice_item_number object that is being displayed by this partial is being used perfectly well by the form helpers as<%= f.text_field :item_number %and<% f.text_field :amount %both work perfectly well. I have tried a number of solutions such as using@invoice_item_number` and explicitly defining an object in the render method but these have not worked. Presumably there is a very simple answer to this.

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• On saving an new active record, in what order are the associated objects saved?

  - by Bryan

  In rails, when saving an active_record object, its associated objects will be saved as well. But has_one and has_many association have different order in saving objects. I have three simplified models: class Team < ActiveRecord::Base has_many :players has_one :coach end class Player < ActiveRecord::Base belongs_to :team validates_presence_of :team_id end class Coach < ActiveRecord::Base belongs_to :team validates_presence_of :team_id end I expected that when team.save is called, team should be saved before its associated coach and players. I use the following code to test these models: t = Team.new team.coach = Coach.new team.save! team.save! returns true. But in another test: t = Team.new team.players << Player.new team.save! team.save! gives the following error: > ActiveRecord::RecordInvalid: > Validation failed: Players is invalid I figured out that team.save! saves objects in the following order: 1) players, 2) team, and 3) coach. This is why I got the error: When a player is saved, team doesn't yet have a id, so validates_presence_of :team_id fails in player. Can someone explain to me why objects are saved in this order? This seems not logical to me.

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• Database error when deleting entry in my rails app.

  - by Danny McClelland

  Hi Everyone...again! I have almost everything in my Rails app working, with the exception of detroying entries. I can destroy entries for companies but not kases and people. The following error show when trying to do so: SQLite3::SQLException: no such column: kases_people.kase_id: SELECT * FROM "kases" INNER JOIN "kases_people" ON "kases".id = "kases_people".kase_id WHERE ("kases_people".person_id = 5 ) I suspect this is an error with the party model for the has_many :through associations that I dont fully understand. You can find an up to date version of the app at www.github.com/dannyweb/surveycontrol Thanks, Danny

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• How to pass form errors in session or flash? [Rails 2.3.5]

  - by yuval

  I have a create action for a form that potentially generates errors (i.e. first name is missing) and then redirects. The problem is, that when the redirect happens those form errors get lost. How could I pass those form errors in a session to be displayed back in the original form (which should still be filled out with the previous details, as in the original error_messages behavior)? Thanks!

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• 'button_to' gives me an ugly URL!

  - by Tyler

  Im trying to get an 'add to cart' button to work. When I use <%= button_to "Add to Cart", :acton = "add_to_cart", :id = @product % and then click the button, I get a URL that puts the action after the ID, like this: 'http://localhost:3000/store/show/1?acton=add_to_cart.' The cart page does not load. What I need is a URL that looks like this: 'http://localhost:3000/store/add_to_cart/1'. I can get that result (and the cart to work) if I don't use 'button_to': <% form_for @product, :url = {:action = "add_to_cart", :id = @product} do |f| % <% end % But, what the heck? Why can't I use 'button_to'?

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• How do I model teams and gameplay in this scorekeeping application?

  - by Eric Hill

  I'm writing a scorekeeping application for card game that has a few possibly-interesting constraints. The application accepts user registrations for players, then lets them check-in to a particular game (modeled as Event). After the final player registers, the app should generate teams, singles or doubles, depending on the preference of the person running the game and some validations (can't do doubles if there's an odd number checked in). There are @event.teams.count rounds in the game. To sum up: An event consists of `@event.teams.count` rounds; Teams can have 1 or more players Events have n or n/2 teams (depending on whether it's singles or doubles) Users will be members of different teams at different events Currently I have a rat's nest of associations: class User < ActiveRecord::Base has_many :teams, :through => :players has_many :events, :through => :teams class Event < ActiveRecord::Base has_many :rounds has_many :teams has_many :players, :through => :teams class Player < ActiveRecord::Base belongs_to :user belongs_to :team end class Team < ActiveRecord::Base has_many :players belongs_to :event end class Round < ActiveRecord::Base belongs_to :event belongs_to :user end The sticky part is team generation. I have basically a "start game" button that should freeze the registrations and pair up teams either singly or doubly, and render to Round#new so that the first (and subsequent) matches can be scored. Currently I'm implementing this as a check on Round#new that calls Event#generate_teams and displays the view: # Event#generate_teams def generate_teams # User has_many :events, :through => :registrations # self.doubles is a boolean denoting 2 players per team registrations.in_groups_of(self.doubles ? 2 : 1, nil).each do |side| self.teams << Player.create(self,side) end end Which doesn't work. Should there maybe be a Game model that ties everything together rather than (my current method) defining the game as an abstraction via the relationships between Events, Users, and Rounds (and Teams and Players and etc.)? My head is swimming.

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• Cocoa/MacRuby: How to write a toolbar which accepts custom items?

  - by Joseph Melettukunnel

  I'm doing my first steps in MacRuby. Does anyone know how I can add a custom Toolbar to my Cocoa/MacRuby application, which will accept "regular" items for e.g. switching the view (see http://www.stevestreeting.com/wp-content/uploads/2011/06/SelectableToolbarDemo001.png). I've read some tutorials and I guess I have to create a custom delegate for the Toolbar and then connect it via the Outlets window, but how does the myCustomDelegate.rb have to look like? Thanks a lot! Cheers

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• Omniauth Facebook authentication on localhost

  - by Ryan Foster

  I am trying to set up Omniauth as described in this Railscast. While it works with Twitter, I am unable to get it working with Facebook. I also set up 'http://localhost:3000' as siteurl and 'localhost' as domain but still see the following error message in the browser: Invalid redirect_uri: Given URL is not allowed by the Application configuration. Does anyone of you have any suggestions on how to fix this? Thanks in advance.

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• Regex for removing certain variable numeric values from some text

  - by stephemurdoch

  I want to substitute all 4 instances of the number 300 from the code below, with 470. <div> <object width="300" height="300"> <embed src="link-removed" width="300" height="300"></embed> </object> <p> <a href="another-link">link</a> </p> </div> The width and height of the code being pasted might not always be 300 by 300. So I figure I probably need a regular expression that subs any numeric value that follows the strings "width=" and "height=", whilst remembering to account for the quotations marks that surround the number. Can anyone tell me if that's the best way, and if so, what would be the best regex? In case it matters, the code being pasted is stored as "text" in the db rather than as a string, as it's quite lengthy (i've removed a few hundred chars from what you see pasted here)...

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• acts_as_revisable 'loses' previous models created before migration

  - by cbrulak

  I have the following the standard, regular post sample app. I created some posts then decided to introduce acts_as_revisable After following the instructions at http://github.com/rich/acts_as_revisable I see that the previous posts are not appearing in the Post.all call. However, if I use the console and do Post.find_by_sql("SELECT * FROM Post WHERE ID=1") the post shows up. Any ideas? Thanks

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• Show a 404 instead of 500 in Rails

  - by Victor P

  In my rails app I have defined the routes so users can access records like http://mydomain.com/qwe2 But if they type a wrong "qwe2" they get a 500 page. I think a 404 would be more appropriate. How can I change the error page that is shown? Thanks

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• rails validate_format_of non-negative integers

  - by ash34

  Hi, I am trying to validate the format of non-negative integers with the following validates_format_of :fundays, :with => /\A[\d]+\Z/, :message => "invalid fundays" And here is the form field used in the view <%= f.text_field :fundays, :maxlength => 3, :style => 'width:50px;' %> However, when I input a non-digit into this field and submit the form, it does not fail the validation. Instead it saves a value of 0 in the database. How do I make it write to the list of error messages. thanks

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• Rails - authoritative source for your database schema?

  - by keruilin

  I have Rails app, and every once in a while, when I bring new developer onboard they exclaim that they should be able to produce the current DB schema in their dev environment by running the whole history of the migrations. I personally don't think that migrations is the authoritative source for your schema. Right now what we do is load a production copy of the DB, with the current schema, onto the dev machine. And, from there, the schema can be maintained via incremental migrations. So my question are: What is the authoritative source of your schema on a Rails project? What is now considered the best-practice way to maintain your DB schema?

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• What exactly is REST architecture and how is it implemented in Rails?

  - by Jagira

  This is what I think of REST architecture. For every resource, there is an unique URI. We can manipulate that object using its URI and HTTP actions [POST, GET, PUT and DELETE]. The HTTP request transfers the representation of the state of that object. In all the texts I have read, REST is explained in a weird and confusing manner. One more thing, RESTFUL implementation in rails produces different urls for different purposes. Like /teams - for 'index' method... /teams/new - for 'new' method and so on. Ain't this moving away from rest, which defines that each resource has one unique URI???

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• Debugging Actionmailer

  - by Trip

  I have actionmailer set up. Emails are not being sent, and no errors. Where can I start my search to debug this? class Notifier < ActionMailer::Base default_url_options[:host] = APP_DOMAIN def email_blast(user, subject, message) subject subject from NOTIFIER_EMAIL recipients user.email sent_on Time.zone.now body :user => user.first_name + ' ' + user.last_name, :message => message end I do get a return in my log that the email was sent, just no actual email goes through. Also the reason, that this is not working is because I switched form a cluster to a solo box and some server settings were overwritten. I suspect that is probably the reason why this is not working. Anyone know what specific server settings I would have to look at ? UPDATE: ActionMailer::Base.delivery_method = :sendmail config.action_mailer.default_url_options = { :host => "75.101.153.93" } I found this in my production.rb . This code was originally here when it worked. Again, I believe that there must be something missing on my server..I did a 'which sendmail' and it returned /usr/bin/sendmail , so I added this : config.action_mailer.raise_delivery_errors = false config.action_mailer.perform_deliveries = true config.action_mailer.sendmail_settings = { :location => '/usr/bin/sendmail', :arguments => '-i -t' } Redeployed, restarted the server, and tested it. No emails were sent. The production.log said something was sent : Processing MediaController#create_a_video (for 173.161.167.41 at 2010-06-03 11:58:13) [GET] Parameters: {"action"=>"create_a_video", "controller"=>"media", "organization_id"=>"470", "_"=>"1275591493194"} Sent mail to [email protected] Rendering media/create_a_video Completed in 128ms (View: 51, DB: 1) | 200 OK [http://invent.hqchannel.com/organizations/470/media/create_a_video?_=1275591493194]

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