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• Is there an ActiveRecord equivalent to using a nested subquery i.e. ... where NOT IN(select...) ?

  - by Snorkpete

  I have 3 models: Category, Account, and SubAccount The relations are: Accounts has_many :sub_accounts Categories has_many :sub_accounts I wanted to get a list of all Categories that are not used by a given account. My method in the Category model currently looks like: class Category < ActiveRecord::Base def self.not_used_by(account) Category.find_by_sql("select * from categories where id not in(select category_id from sub_accounts where account_id = #{account.id})") end end My question is, is there a cleaner alternative than using SQL? NB. I am currently using Rails 3(beta)

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• Rails routing issue

  - by Brob

  Hi I've just started learning rails and been going through some tutorials from learning rails (http://www.buildingwebapps.com/podcasts/79335-putting-the-page-contents-into-the) The tutorials appear to be Rails v2 and I'm on Rails v3 There is a line in the routes file which appears to be causing a problem map.view_page ':name', :controller => 'viewer', :action => 'show' The line works for the front end view i.e. my viewer controller but not for the back end I get the error NoMethodError in Viewer#show I think this has something to do with the view I am using and the line <%= @page.body %> I know it's difficult without the full code but if anyone can help that would be awesome

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• problem using default_scope on a model table

  - by DannyRe

  Hey. In my controller/index action I use the following query: @course_enrollments = current_user.course_enrollments This is what my table looks like. It is referencing a course table. The course table has a colum 'title'. create_table "course_enrollments", :force => true do |t| t.integer "user_id", :null => false t.integer "course_id", :null => false t.datetime "created_at" t.datetime "updated_at" end I want to be able to order my course_enrollments by course in my index view. Furthermore Id like to do a default_scope in my model, like this: default_scope :order => 'title asc' any suggestions? Thx for your time

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• is using has_and_belongs_to_many for models is a bad idea?

  - by Vamsi

  Can some one please explain the the pros and cons between has_many :through and has_and_belongs_to_many?

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• Assign multiple css classes to a table element in Rails

  - by Eric K

  I'm trying to style a table row using both cycle and a helper, like shown: <tr class= <%= cycle("list-line-odd #{row_class(item)}", "list-line-even #{row_class(item)}")%> > However, when I do this, the resulting HTML is: <tr class = "list-line-odd" lowest-price> with the return from the helper method not enclosed in the quotes, and therefore not recognized. Here's the helper I'm using: def row_class(item) if item.highest_price > 0 and item.lowest_price > 0 and item.highest_price != item.lowest_price if item.current_price >= item.highest_price "highest-price" elsif item.current_price <= item.lowest_price "lowest-price" end end end I must be missing something obvious, but I just can't figure out how to wrap both the result of cycle and the helper method return in the same set of quotes. Any help would be greatly appreciated!

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• Ultra-grand super acts_as_tree rails query

  - by Bloudermilk

  Right now I'm dealing with an issue regarding an intense acts_as_tree MySQL query via rails. The model I am querying is Foo. A Foo can belong to any one City, State or Country. My goal is to query Foos based on their location. My locations table is set up like so: I have a table in my database called locations I use a combination of acts_as_tree and polymorphic associations to store each individual location as either a City, State or Country. (This means that my table consists of the rows id, name, parent_id, type) Let's say for instance, I want to query Foos in the state "California". Beside Foos that directly belong to "California", I should get all Foos that belong every City in "California" like Foos in "Los Angeles" and "San Francisco". Not only that, but I should get any Foos that belong to the Country that "California" is in, "United States". I've tried a few things with associations to no avail. I feel like I'm missing some super-helpful Rails-fu here. Any advice?

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• Error with jquery-autocomplete in rails

  - by alexBrand

  I've been trying to get autocomplete to work, however, I am getting a weird javascript error in the firebug console... I used the https://github.com/crowdint/rails3-jquery-autocomplete gem. The error I am getting reads: $(e).autocomplete is not a function Here are the scripts i am including in my html: <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js" type="text/javascript"></script> <script src="/javascripts/autocomplete-rails.js?1294035084" type="text/javascript"></script> Thanks

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• Saving multiple select form data in db

  - by fl00r

  Hi. I've got form for some model A, which has got few fields: tile description ... colors colors are selected from multiple select and options are ['red', 'green', 'blue', 'yellow']. User can choose colors as many as he wants. I don't think that making Color model and has_many relationship is good solution here to store colors data in model A. So question is: How to store multiple data in db for such multiple select forms?

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• Rails 3: How not to include column's name in a validation message without plugins ?

  - by Misha Moroshko

  I have the following validation: validates_presence_of :price, :message => "my message" and I get the following error when the price is blank: Price my message Is there a way not to include the column name (price) in the message ? I tried to do: validates_presence_of :price, :message => "^ my message" as suggested here, but it didn't work for me. I got the following message: Price ^ my message

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• rails howto use environment constant in models and views?

  - by fenec

  i have my constants initialized in environment.rb like this : Rails::Initializer.run do |config| ... MAX_BID = 10 end i would like to use this constant in my models and views,what is the correct syntax? if a use it a model its says NameError: uninitialized constant User::MAX_BID i understand that it is looking for the constant inside the model , how can i tell explicitly that this constant is in the environment? thanks

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• How can I separate error_messages from two forms on one page?

  - by itkevin

  I have two forms in one view updating the User Profile. One Form is to Update my name etc. and one is to change my password. Profile Form: - form_for @user, :url => account_path do |f| = f.error_messages ...form fields here... Password Form: - form_for @user, :url => account_path do |pf| = pf.error_messages ...password fields here... As you can see they both point to the same update action in the users controller. If I type in a invalid password both error_messages show me the same error message. How can I output separate error messages per form?

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• Add Shortcut to Nested Route

  - by wakeless

  I'm using nested routes and I want to provide some sort of a shortcut method. (I'm using RoR 3.0) The routes look like this. resources :countries do resources :regions do resources :wineries end end To access a winery route I want to be able to define a function that removes the need to specify a country and region each time. Like: def winery_path(winery) country_region_winery_path (winery.country, winery.region, winery) end Where should I do this? How can I get that to be available whereever url_for is available?

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• Need ideas for reprocessing images using attachment_fu

  - by cswebgrl

  Hi, I discovered a bug in my Rails app due to Rails app and gems upgrades and undocumented code from the previous developers. I have a lot of images that have been processed, but not sized correctly using attachment_fu. All of the images that were uploaded since the upgrade need to be resized correctly. Does anyone have any ideas to reprocess all of the images within the folders and resize them to the correct sizes? I'd hate to have to do these all manually. THANKS!! Cindy

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• Rails 3 remote resubmit form with dynamic fields

  - by montrealmike

  I have a form which has remote => true. When i submit it the first time everything works well. If there are any errors i want to add new fields to this form. I did this with update.js.erb. The problem is that when i resubmit this form, the result js file is rendered as html (ie i see the js file text on the screen). This is the same update.js.erb file that was rendered as js the first time... Any idea what i'm missing?

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• access properties of current model in has_many declaration

  - by seth.vargo

  Hello, I didn't exactly know how to pose this question other than through example... I have a class we will call Foo. Foo :has_many Bar. Foo has a boolean attribute called randomize that determines the order of the the Bars in the :has_many relationship: class CreateFoo < ActiveRecord::Migration def self.up create_table :foos do |t| t.string :name t.boolean :randomize, :default => false end end end   class CreateBar < ActiveRecord::Migration def self.up create_table :bars do |t| t.string :name t.references :foo end end end   class Bar < ActiveRecord::Base belongs_to :foo end   class Foo < ActiveRecord::Base # this is the line that doesn't work has_many :bars, :order => self.randomize ? 'RAND()' : 'id' end How do I access properties of self in the has_many declaration? Things I've tried and failed: creating a method of Foo that returns the correct string creating a lambda function crying Is this possible? UPDATE The problem seems to be that the class in :has_many ISN'T of type Foo: undefined method `randomize' for #<Class:0x1076fbf78> is one of the errors I get. Note that its a general Class, not a Foo object... Why??

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• Rails 3: How to validate that A < B where A and B are both model attributes ?

  - by Misha Moroshko

  I would like to validate that customer_price >= my_price. I tried the following: class Product < ActiveRecord::Base attr_accessor :my_price validates_numericality_of :customer_price, :greater_than_or_equal_to => my_price ... end (customer_price is a column in the Products table in the database, while my_price isn't.) Here is the result: NameError in ProductsController#index undefined local variable or method `my_price' for #<Class:0x313b648> What is the right way to do this in Rails 3 ?

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• Where to reopen a class in RoR

  - by Jeriko

  I'm attempting to reopen the String class in rails and add a bunch more methods for my app to use. Writing the code isn't a problem - my question is rather about where this code should go. It doesn't make sense to me to reopen a class inside a different model file, because it really has nothing to do with any of the models specifically. I thought perhaps somewhere in config or lib would make sense, but I'm not particularly well versed with RoR yet. To summarize, where would be the most logical place to define class-modifying code?

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• Rails 3 Nested Forms

  - by Mike

  I have a Person model and an Address Model: class Person < ActiveRecord::Base has_one :address accepts_nested_attributes_for :address end class Address < ActiveRecord::Base belongs_to :person end In my people controller I have @person.build_address in my new action. My forms builds correctly. The problem is that when I submit the form, a person record and an address record is created but they aren't linked via the address_id column in the Person table. Am I missing a step in the controller? Thanks! New Action UPDATE def new @person = Person.new @person.build_address respond_to do |format| format.html # new.html.erb format.xml { render :xml => @person } end end Form Code UPDATE <%= form_for(@person) do |f| %> <% if @person.errors.any? %> <div id="error_explanation"> <h2><%= pluralize(@person.errors.count, "error") %> prohibited this person from being saved:</h2> <ul> <% @person.errors.full_messages.each do |msg| %> <li><%= msg %></li> <% end %> </ul> </div> <% end %> <div class="field"> <%= f.label :first_name %><br /> <%= f.text_field :first_name %> </div> <div class="field"> <%= f.label :last_name %><br /> <%= f.text_field :last_name %> </div> <div class="field"> <%= f.label :email %><br /> <%= f.text_field :email %> </div> <div class="field"> <%= f.label :telephone %><br /> <%= f.text_field :telephone %> </div> <div class="field"> <%= f.label :mobile_phone %><br /> <%= f.text_field :mobile_phone %> </div> <div class="field"> <%= f.label :date_of_birth %><br /> <%= f.date_select :date_of_birth %> </div> <div class="field"> <%= f.label :gender %><br /> <%= f.select(:gender, Person::GENDER_TYPES) %> </div> <div class="field"> <%= f.label :notes %><br /> <%= f.text_area :notes %> </div> <div class="field"> <%= f.label :person_type %><br /> <%= f.select(:person_type, Person::PERSON_TYPES) %> </div> <%= f.fields_for :address do |address_fields| %> <div class="field"> <%= address_fields.label :street_1 %><br /> <%= address_fields.text_field :street_1 %> </div> <div class="field"> <%= address_fields.label :street_2 %><br /> <%= address_fields.text_field :street_2 %> </div> <div class="field"> <%= address_fields.label :city %><br /> <%= address_fields.text_field :city %> </div> <div class="field"> <%= address_fields.label :state %><br /> <%= address_fields.select(:state, Address::STATES) %> </div> <div class="field"> <%= address_fields.label :zip_code %><br /> <%= address_fields.text_field :zip_code %> </div> <% end %> <div class="actions"> <%= f.submit %> </div> <% end %>

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• Determining which video format to use

  - by pcasa

  I want to upload a video file and convert it to flash and 3gp/mp4. No problem, plenty of tuts for this out there using paperclip and ffmpeg. For some reason I thought there was a tut that showed if std browser play flv but if mobile then use 3gp/mp4 but can't seem to find it. Any one know if there is a tut like this out there? Else, Can I tell paperclip which is flv and 3gp/mp4. Then later call something in the view like video_url(:flv) or video_url(:mp4) or set this globally if mobile?

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• Using scope, defined in parent model, inside it's child (STI pattern)

  - by Anton

  I implement a class hierarchy using STI pattern class A scope :aaa, where([someField]:[someValue]) end class B < A end The problem is that when I try to call something like: B.limit(5).aaa => SELECT "[table]".* FROM "[table]" WHERE "[table]"."type" IN ('A') AND ([someField] = [someValue]) LIMIT 5 So I am getting 5 objects of type A, which satisfies scope :aaa But I need to do the same with rows where type = "B" Is there any way to use scopes from parent, without redifinning it in childs in STI pattern? Thanks in advance EDITED I just discussed it with my frind and he showed me one important thing. A in not the root class of STI. IN fact whole hierarchy looks like class O < ActiveRecord::Base end class A < O scope ..... ..... end class B < A end maybe the reason is in hierarchy itself?...

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• I am validating for RegEx errors -- how can I return which keyword, it failed on?

  - by Trip

  I'm passing new objects through this set of regex : (?i)exp\s|(?i)expire\s|(?i)print|(?i)mention|(?i)spring|(?i)summer|(?i)winter|(?i)jan(\s|\.)|(?i)january|(?i)february|(?i)feb(\.|\s)|(?i)march|mar(\.|\s)|(?i)april|(?i)june|(?i)july|(?i)august|(?i)aug(\s|\.)|(?i)september|(?i)sept(\.|\s)|(?i)november|(?i)nov(\.|\s)|(?i)december|(?i)dec(\.|\s)|(?i)holiday|(?i)christmas|(?i)holloween|(?i)easter|(?i)season|(?i)ends|(?i)end If it errors, for example on the word christmas , how can I dynamically pull the word it errors on, and display it as the cause of the error?

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• Network ActiveRecord relation with Rails

  - by Zag zag..

  Hi, I have a has and belongs to many relation between User and Article models, and I would like to link them even if an article if not hosted on the same database then a user. For example, If an article exists at foo.com/articles/3 and a user exists at bar.com/users/1, If would like to be able to do from foo.com web interface or bar.com web interface this kind of query: a_user.articles (or an_article.users). I think this can be possible adding a field like "url" in users and articles tables. But I don't know how to process for ActiveRecord. My Article model looks like this: class Article < ActiveRecord::Base has_and_belongs_to_many :users end Is there yet some example of project using this kind of relation over internet? Many thanks

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• Controller not accepting params value but the same value hard coded is accepted

  - by Numbers

  Rails.logger.info(params[:question]) => {"title"=>"katt"} @question_list.questions.create(params[:question]) => ActiveModel::ForbiddenAttributesError (ActiveModel::ForbiddenAttributesError) @question_list.questions.create("title"=>"katt") # SUCCES! I cannot understand why Rails not accepts the params when the exact same value written by hand works fine? Update controller: def new_question @question_list.questions.create(params[:question]) render nothing: true end private def set_question_list @question_list = QuestionList.find(params[:id]) end def question_list_params params.require(:question_list).permit(questions_attributes: [:id, :question_list_id, :title, :position, :_destroy]) end view: <%= form_for @question_list, url: new_question_question_list_path, remote: true do |f| %> <%= f.text_field :title %> <%= f.submit %> <% end %>

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• No route matches [GET] "/user/sign_out"

  - by user3399101

  So, I'm getting the below error when clicking on Sign Out on my drop down menu on the nav: No route matches [GET] "/user/sign_out" However, this only happens when using the sign out on the drop down nav (the hamburger menu for mobile devices) and not when clicking the sign out on the regular nav. See the code below: <div class="container demo-5"> <div class="main clearfix"> <div class="column"> <div id="dl-menu" class="dl-menuwrapper"> <button class="dl-trigger">Open Menu</button> <ul class="dl-menu dl-menu-toggle"> <div id="closebtn" onclick="closebtn()"></div> <% if user_signed_in? %> <li><%= link_to 'FAQ', faq_path %></li> <li><a href="#">Contact Us</a></li> <li><%= link_to 'My Account', account_path %></li> <li><%= link_to 'Sign Out', destroy_user_session_path, method: 'delete' %></li> <--- this is the line <% else %> <li><%= link_to 'FAQ', faq_path %></li> <li><a href="#">Contact Us</a></li> <li><%= link_to 'Sign In', new_user_session_path %></li> <li><%= link_to 'Free Trial', plans_path %></li> <% end %> </ul> </div><!-- /dl-menuwrapper --> </div> </div> </div><!-- /container --> </div> And this is the non-drop down code that works: <div class="signincontainer pull-right"> <div class="navbar-form navbar-right"> <% if user_signed_in? %> <%= link_to 'Sign out', destroy_user_session_path, class: 'btn signin-button', method: :delete %> <div class="btn signin-button usernamefont"><%= link_to current_user.full_name, account_path %></div> <% else %> ....rest of code here Updated error: ActionController::RoutingError (No route matches [GET] "/user/sign_out"): actionpack (4.0.4) lib/action_dispatch/middleware/debug_exceptions.rb:21:in `call' actionpack (4.0.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' railties (4.0.4) lib/rails/rack/logger.rb:38:in `call_app' railties (4.0.4) lib/rails/rack/logger.rb:20:in `block in call' activesupport (4.0.4) lib/active_support/tagged_logging.rb:68:in `block in tagged' activesupport (4.0.4) lib/active_support/tagged_logging.rb:26:in `tagged' activesupport (4.0.4) lib/active_support/tagged_logging.rb:68:in `tagged' railties (4.0.4) lib/rails/rack/logger.rb:20:in `call' quiet_assets (1.0.2) lib/quiet_assets.rb:18:in `call_with_quiet_assets' actionpack (4.0.4) lib/action_dispatch/middleware/request_id.rb:21:in `call' rack (1.5.2) lib/rack/methodoverride.rb:21:in `call' rack (1.5.2) lib/rack/ru

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• root path for multiple controllers on rails routes

  - by Lee

  I have two resource controllers where I am using a slug to represent the ID. (friendly_id gem). I am able to have the show path for one resource on the route but not for two at the same time. ie. root :to => 'home#index' match '/:id' => "properties#show" match '/:id' => "contents#show" Basically I want urls like, # Content domain.com/about-us domain.com/terms # Property domain.com/unique-property-name domain.com/another-unique-property-name Whatever resource I put on top works. Is there a way to do this? Thanks in advace if you can help.

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