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• Enforcing a Uniqueness Constraint in a Nested Form

  - by Euwyn

  I'm trying not to fight the defaults here and use Rails built-in support for nested attributes (from http://ryandaigle.com/articles/2009/2/1/what-s-new-in-edge-rails-nested-attributes). I'm labeling Things with Tags, and all works swell, and for each Thing I have a form with a nested field that creates a new Tag by a name. Trouble is, I need to make sure that each Tag has a unique name. Instead of creating a new Tag, if a user enters the name of one that already exists, I need to create the associate with that pre-existing Tag. How do I do this?

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• Rails migrations: Undo default setting for a column

  - by wulfovitch

  Hi Stack Overflow Community! I have the problem, that I have an migration in Rails that sets up a default setting for a column, like this example: def self.up add_column :column_name, :bought_at, :datetime, :default => Time.now end Suppose, I like to drop that default settings in a later migration, how do I do that with using rails migrations? My current workaround is the execution of a custom sql command in the rails migration, like this: def self.up execute 'alter table column_name alter bought_at drop default' end But I don't like this approach, because I am now dependent on how the underlying database is interpreting this command. In case of a change of the database this query perhaps might not work anymore and the migration would be broken. So, is there a way to express the undo of a default setting for a column in rails? Thanks in advance!

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• Keeping dates in order when using date_select and discarding year in Rails?

  - by MikeH

  My app has users who have seasonal products. When a user selects a product, we allow him to also select the product's season. We accomplish this by letting him select a start date and an end date for each product. We're using date_select to generate two sets of drop-downs: one for the start date and one for the end date. Including years doesn't make sense for our model. So we're using the option: discard_year => true To explain our problem, consider that our products are apples. Vendor X carries apples every year from September to January. Years are irrelevant here, and that's why we're using discard_year => true. However, while the specific years are irrelevant, the relative point in time from the start date to the end date is relevant. This is where our problem arises. When you use discard_year => true, Rails does set a year in the database, it just doesn't appear in the views. Rails sets all the years to 0001 in our app. Going back to our apple example, this means that the database now thinks the user has selected September 0001 to January 0001. This is a problem for us for a number of reasons. To solve this, the logic that I need to implement is the following: - If season_start month/date is before season_end month/date, then standard Rails approach is fine. - But, if season_start month/date is AFTER season_end month/date, then I need to dynamically update the database field such that the year for season_end is equal to the year for season_start + 1. My best guess is that I would create a custom method that runs as an after_save or after_update in my products model. But I'm not really sure how to do this. Ideas? Anybody ever had this issue? Thanks!

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• Bootstrap Modal & rails remote

  - by Kevin Brown

  Using this bootstrap modal extension and animate.css for fun, how can I take a make an easy ajax modal using :remote => true to fill in the modal box? Also, how would I use the bootstrap modal default "submit/cancel" buttons to interact with a form that's loaded? I'm looking for a more dynamic solution instead of hard-html-ing every modal into the page or using a bunch of jquery ajax calls for each dialog. I've done a few quick searches, but they've turned up nil for this particular solution.

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• (Rails) Assert_Select's Annoying Warnings

  - by CalebHC

  Does anyone know how to make assert_select not output all those nasty html warnings during a rake test? You know, like this stuff: .ignoring attempt to close body with div opened at byte 1036, line 5 closed at byte 5342, line 42 attributes at open: {"class"=>"inner02"} text around open: "</script>\r\t</head>\r\t<body class=\"inner02" text around close: "\t</div>\r\t\t\t</div>\r\t\t</div>\r\t</body>\r</ht" Thanks

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• radrails automatically giving me two tabs when i go to new line.

  - by Kirby

  So any time i hit enter and go to a new line... radrails automatically gives me two tabs over. I'd rather turn this off. I haven't been able to figure out how in the settings. Ideas? thoughts? is 2 tabs preferred for a specific reason?

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• Rails has-and-belongs-to-many form question

  - by swilliams

  Sorry for the semi-generic title, but I'm still pretty new at rails and couldn't think of a succinct way to put the question. I have a basic habtm model setup: a Project has many Resources and a Resource can have many Projects. I have the database and models setup properly, and can do everything I need to via the console, but I'm having trouble translating it all into the view. On the show view for the Project, I want to be able to create a Resource and automatically assign it to the current Project. Here's my basic html: <p> <b>Name:</b> <%=h @project.name %> </p> <h2>Equipment</h2> <ul> <% @project.resources.each do |r| %> <li><%=h r.name %></li> <% end %> </ul> <h2>Add A Resource</h2> <% form_for(@project) do |f| %> <%= f.error_messages %> <p> Resource Name:<br /> <%= f.text_field :resources %> </p> <p> <%= f.submit 'Create' %> </p> <% end %> Obviously, that form won't work, but I'm at a loss for what to do next. I've searched around for various examples, but haven't found one for what I'm trying to do here. One thing I've thought of was to change the form to be form_for(Resource.new) and include a hidden input of the @project.id. And then when the resource_controller handles the form, check for that id and go from there. That seems like an ugly kludge though.

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• get last insert id when using Activerecord

  - by pierr

  Hi, For Sqilte3 C API, I would use sqlite3_last_insert_rowid. How to get this id when using ActiveRecord after insert a new record? I use following way to insert a new record : Section.new |s| s.a = 1 s.b = 2 #I expected the return value of save to be the last_insert_id, but it is NOT s.save end

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• Rails 3 : Can't get form_for to work as a 'delete' following the RESTful achitecture => always giving a ROUTING ERROR

  - by Alex

  I have a very simple render that goes as follow: <%= form_for(:relationships, :url => relationships_path, :html => {:method => 'delete'}) do |f| %> <div><%= f.hidden_field :user_id_to_unfollow, :value => @user.id %></div> <div class="actions"><%= f.submit "Unfollow" %></div> <% end %> When I submit this form it will always give me a Routing Error No route matches "/relationships" on my page. In my relationships controller, I have created all the propers methods: def create ... end def destroy ... end def update ... end def show ... end And in my routes config I have made sure to allow all routes for the relationships controller resources :relationships But I can't seem to get into the destroy method of the controller :( However if I remove the :html => {:method => 'delete'} method parameter in the form_for then I get to the create method of the controller no pb. I don't get it.... Alex

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• Devise authenticating with username instead of email

  - by teknull

  I'm new to Devise and have it working fine by using an email address as the authentication key. However, I have a use case which requires a username instead and I can't seem to get it working. I've added a string column, "username" to the users table, changed the fields from :email to :username in the sign-in form, and have changed the authentication key in devise.rb to :username yet when I go to sign in I'm met with this prompt: "Please enter an email address". What am I doing wrong? **new.html.erb** <div><%= f.label :username %><br /> <%= f.email_field :username %></div> **User.rb** class User < ActiveRecord::Base # Include default devise modules. Others available are: # :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable, :authentication_keys => [:username] # Setup accessible (or protected) attributes for your model attr_accessible :email, :password, :password_confirmation, :remember_me, :username # attr_accessible :title, :body end **devise.rb** config.authentication_keys = [ :username ]

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• intelligent thin start with port alias for bash

  - by seaofclouds

  i would like a single alias (ts) which starts my local development server. the script should test for an open port starting at 3000 and use the first available port. additionally, some sites require a rackup file, making -R config.ru necessary. this script should check the current directory for the config.ru file and add that to the alias if present. currently, to start my local development environment, i run: alias ts="thin -R config.ru -p 3000 start" often, i need to run several servers to test different sites, so i've created additional aliases: alias ts1="thin -R config.ru -p 3001 start"

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• protect_from_forgery & Unobtrusive Javascript

  - by Matt Grande

  Hi all, I have some javascript making an ajax call in my Rails site: $.ajax({type: "PUT", url: url, data: { dummy: data }, complete: function(data) {}}); When Rails gets it, it throws back an ActionController::InvalidAuthenticityToken Error. I'd like to keep the protect_from_forgery stuff in there, if possible... But I'm at a loss for how can I pass the auth token from a javascript file? Can anyone help me out?

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• Ajax Push Engine

  - by gkrdvl

  Hi all, are there anyone hear about APE (Ajax Push Engine) before ? I'm building Rails application and trying to create group chat with this APE realtime engine, the problem is how to make Rails communicate with APE Server ? Are there any tutorial or reference on working APE with Rails ?

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• Rails 2.3.2: Accessing Model Specific Data in Another Model

  - by Gimli

  I'm using Rails 2.3.2 and using Paperclip to upload photos. I'm also using a slightly customized subdomain_accounts.rb to set some account-specific variables. My question is this: How can I set the bucket used in Paperclip to be dependent on the current account? Since this looks to be a model attribute set up early on, how can I override it later? Thanks.

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• file_field is not sticky in my Rails form

  - by Tony

  I have a pretty standard Rails form: <div> <h1>Create a New Listing</h1> <%- form_for @listing, :html => {:multipart => true} do |f| -%> <div><%= f.label :title, "Title:"%> <%= f.text_field :title %></div> <div> <%= f.label :image, "Image:" %> <%= f.file_field :image </div> <div> <%= f.label :sound, "Sound Clip:"%> <%= f.file_field :sound %><br /> </div> <div class="submit"><%= f.submit 'Post Listing' %></div> <%- end -%> </div> When a user chooses a file, but the form fails for validation purposes, he must always re-select the file. It is not sticky. Any suggestion on how to fix this? Thanks!

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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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• DRb connecting to linux client from windows

  - by Christopher Dancy

  I have a few DRb services running on different windows machines and they can all connect and talk with each other just fine. When I put these DRb services on Linux machines and try to connect from windows nothing happens and I get a DRB:ConnError ... the service on Linux is never touched. So I did a netstat on the linux box and the service(port) were not listed anywhere even though the program is clearly running. Is there someting that I'm missing when talking to DRb services on Linux from a windows machine?

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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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• rails solr search limit total search results / get fixed number of results

  - by kLeos

  I'm trying to perform a search, order the results randomly, and only return a number of results, not all matches. Something like limit(2) I've tried using the Solr param 'rows' but that doesn't seem to do anything: @featured_articles = Article.search do with(:is_featured, true) order_by :random adjust_solr_params do |params| params[:rows] = 2 end end @featured_articles.total should be 2, but it returns more than 2 How can I get a randomized fixed number of results?

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• Trouble using termextraction ge

  - by mathee

  I'm trying to install this gem: http://github.com/alexrabarts/term_extraction. It required nokogiri, which I tried installing. I'm getting this as the output: >gem install nokogiri Successfully installed nokogiri-1.4.2.1-x86-mswin32 1 gem installed Installing ri documentation for nokogiri-1.4.2.1-x86-mswin32... No definition for parse_memory No definition for parse_file No definition for parse_with No definition for get_options No definition for set_options Installing RDoc documentation for nokogiri-1.4.2.1-x86-mswin32... No definition for parse_memory No definition for parse_file No definition for parse_with No definition for get_options No definition for set_options I was able to install the termextraction gem (per the README on git repo): >gem install alexrabarts-term_extraction -s http://gems.github.com Successfully installed alexrabarts-term_extraction-0.1.4 1 gem installed Installing ri documentation for alexrabarts-term_extraction-0.1.4... Installing RDoc documentation for alexrabarts-term_extraction-0.1.4... The issue is that I'm trying to test it out, but I'm getting an "uninitialized constant" error when I use it: ActionView::TemplateError (uninitialized constant ApplicationHelper::TermExtraction) on line #3 of app/views/questions/new. haml: 1: %h1 New question 2: -msg = "testing this context thing let's see what it gives me" 3: -getTerms(msg) 4: #new-question-form 5: .box-background 6: -form_for(@question) do |f| app/helpers/application_helper.rb:42:in `getTerms' app/views/questions/new.haml:3:in `_run_haml_app47views47questions47new46haml' haml (2.2.23) lib/haml/helpers/action_view_mods.rb:13:in `render' haml (2.2.23) lib/haml/helpers/action_view_mods.rb:13:in `render' app/controllers/questions_controller.rb:91:in `new' haml (2.2.23) lib/sass/plugin/rails.rb:20:in `process' Here is application_helper.rb: module ApplicationHelper def getTerms(context) yahoo = TermExtraction::Yahoo.new(:api_key => 'myAPIkey', :context => context) end end I'm not sure what the issue is. Any insight would be greatly appreciated!

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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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• 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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• How do you unpack gems using jruby on rails 2.3?

  - by James Moore

  I'm trying to unpack all the system gems to end up with a standalone Rails directory including all the rails gems and all the system gems. I'm starting with a bare rails setup; just did a jruby -S rails and a 'generate jdbc'. I then add a config.gem 'jdbc-mysql' to environment.rb and do the jruby -S rake gems:unpack:dependencies. After unpacking, if I do a rake I get: no such file to load -- jdbc-mysql Is there something else you need to do to get the jdbc gem unpacked? I'm using jruby 1.4.0 (and moving to 1.5 is on my todo list) and rails 2.3.8.

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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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• 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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