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• has_many :through on self?

  - by Glex

  I have a User model. A user can be either a dj, a club, or a clubber (this is controlled by the User#account_type attribute). A club can have many djs, and a dj can have many users: enumerated_attribute :account_type, %w(^clubber dj club), :nil => false do label :clubber => "Clubber" label :dj => "DJ" label :club => "Club" end has_many :dj_club_relationships, :class_name => "User", :dependent => :destroy has_many :dj_user_relationships, :dependent => :destroy has_many :djs, :through => :dj_club_relationships, :class_name => "User" has_many :users, :through => :dj_user_relationships However, this doesn't work as well as expected, since Rails doesn't know, for example, that it needs to destroy all dj_club_relationships with club_id when the user being destroyed is a club, and with dj_id when the user is a dj. How can I help rails know about it?

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• NGINX, Unicorn, Mediatemple dv server

  - by BandsOnABudget

  Anyone every try to set up nginx & unicorn for their rails apps on a mediatemple dv server? Did you document it?

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• Using JSON with jRails

  - by Zachary

  I am currently trying to use AJAX in my application via jRails. I am trying to return a JSON object from my controller, and then parse it in my Javascript. I am using json2.js to do the parsing. Here is the code I currently have: function getSomething() { $.ajax({ type: "GET", url: "map/testjson", success: function(data) { var myData = JSON.parse(data[0]); window.alert(myData.login); } }); } and in the controller: class Map::MapController < ApplicationController def index end def testjson @message = User.find(:all) ActiveRecord::Base.include_root_in_json = false respond_to do |w| w.json { render :json => @message.to_json } end end end The window.alert simply says 'undefined' (without tics). However, if I change the javascript to window.alert(data) (the raw object returned by the controller) I get: [{"salt":"aSalt","name":"", "created_at":"2010-03-15T02:34:25Z","remember_token_expires_at": null,"crypted_password":"aPassword", "updated_at":"2010-03-15T02:34:25Z","id":1,"remember_token":null, "login":"zgwrig2","email":"[email protected]"}] This looks like an array of size 1, if I'm looking at it correctly, but I have tried just about every combination of JSON.parse on the data object that I can think of, and nothing seems to work. Any ideas on what I'm doing wrong here?

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• Paperclip plugin on Rails 3

  - by Jiang

  Hi all, I tried to use paperclip plugin on rails 3-beta 3. I installed this plugin successfully, but when I use the following script to generate: rails generate paperclip xxx xxx it said generator not found. Any ideas? Thanks.

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• Stack Overflow-like tag selector for Rails

  - by David Tildon

  I want to use tags for a model in my Rails application, and I'd like to have the same kind of tag selection mechanism that Stack Overflow has when asking a question. I.e. I type in 'rails' and it drops down a list of tags that include 'rails', and I can go on to add more tags from there. Is there a plugin that can do this? I'm comfortable putting together the tag model and migrations myself, that isn't an issue. I just need something to handle the AJAX and javascript. I'm using prototype and Rails 2.3.

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• Generate a controller with all the RESTful functions

  - by Barb

  Hello, I am trying to generate a controller with all the RESTful actions stubbed. I had read at link text that all I needed to do was to use call the generator with just a controller name I would get just that. So, I ran "script/generate rspec_controller Properties" and I got an empty controller. Any other suggestions would be greatly appreciated.

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• ~/.irbrc not executed when starting irb or script/console

  - by Patrick Klingemann

  Here's what I've tried: 1. gem install awesome_print 2. echo "require 'ap'" >> ~/.irbrc 3. chmod u+x ~/.irbrc 4. script/console 5. ap { :test => 'value' } Result: NameError: undefined local variable or method `ap' for # Some additional info: Fedora 13 (observed this issues in prior versions of Fedora also) bash --version Produces: GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu) Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software; you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

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• how to save nested form attributes to database

  - by siulamvictor

  I am not really understand how's the nested attributes work in Rails. I have 2 models, Accounts and Users. Accounts has_many Users. When a new user filled in the form, Rails reported User(#2164802740) expected, got Array(#2148376200) Is that Rails cannot read the nested attributes from the form? How can I fix it? How can I save the data from nested attributes form to database? Thanks all~ Here are the MVCs: Account Model class Account < ActiveRecord::Base has_many :users accepts_nested_attributes_for :users validates_presence_of :company_name, :message => "companyname is required." validates_presence_of :company_website, :message => "website is required." end User Model class User < ActiveRecord::Base belongs_to :account validates_presence_of :user_name, :message => "username too short." validates_presence_of :password, :message => "password too short." end Account Controller class AccountController < ApplicationController def new end def created end def create @account = Account.new(params[:account]) if @account.save redirect_to :action => "created" else flash[:notice] = "error!!!" render :action => "new" end end end Account/new View <h1>Account#new</h1> <% form_for :account, :url => { :action => "create" } do |f| %> <% f.fields_for :users do |ff| %> <p> <%= ff.label :user_name %><br /> <%= ff.text_field :user_name %> </p> <p> <%= ff.label :password %><br /> <%= ff.password_field :password %> </p> <% end %> <p> <%= f.label :company_name %><br /> <%= f.text_field :company_name %> </p> <p> <%= f.label :company_website %><br /> <%= f.text_field :company_website %> </p> <% end %> Account Migration class CreateAccounts < ActiveRecord::Migration def self.up create_table :accounts do |t| t.string :company_name t.string :company_website t.timestamps end end def self.down drop_table :accounts end end User Migration class CreateUsers < ActiveRecord::Migration def self.up create_table :users do |t| t.string :user_name t.string :password t.integer :account_id t.timestamps end end def self.down drop_table :users end end Thanks everyone. :)

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• Weird response for controller.request.format.html? in Rails

  - by Tony

  In my main controller, I have this: class MainController < ApplicationController before_filter do |controller| logger.info "controller.request.format.html? = #{controller.request.format.html?}" logger.info "controller.request.format.fbml? = #{controller.request.format.fbml?}" controller.send :login_required if controller.request.format.html? controller.send :facebook_auth_required if controller.request.format.fbml? end As expected, I get "true" for the ...fbml? line if a request comes from Facebook (my facebooker gem automatically sets the format). However, I get "5" for the ...html? line if the request comes from Facebook. Why would a method with a ? ever return a "5"? Isn't that against Rails conventions? Also, I think "5" is considered true so this might mess up my filters. Still looking into that... Any ideas?

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• Rmagick, Watermarks, and Image Transparency

  - by Hulihan Applications

  I'm having trouble making an image semi-transparent. I have one image I'd like to set to 50% opacity and position it over another image(using composite operator:OverCompositeOp). Anyone know how an easy way to do such a thing? A little background: I'm trying to make a good watermark to place over images, but I'm not fan of rmagick's built-in watermark() function or the shade-composite method.

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• Recommended way to test ActiveRecord associations?

  - by Sugerman

  I have written my basic models and defined their associations as well as the migrations to create the associated tables. I want to be able to test: The associations are configured as intended The table structures support the associations properly I've written FG factories for all of my models in anticipation of having a complete set of test data but I can't grasp how to write a spec to test both belongs_to and has_many associations. For example, given an Organization that has_many Users I want to be able to test that my sample Organization has a reference to my sample User. Organization_Factory.rb: Factory.define :boardofrec, :class => 'Organization' do |o| o.name 'Board of Recreation' o.address '115 Main Street' o.city 'Smallville' o.state 'New Jersey' o.zip '01929' end Factory.define :boardofrec_with_users, :parent => :boardofrec do |o| o.after_create do |org| org.users = [Factory.create(:johnny, :organization => org)] end end User_Factory.rb: Factory.define :johnny, :class => 'User' do |u| u.name 'Johnny B. Badd' u.email '[email protected]' u.password 'password' u.org_admin true u.site_admin false u.association :organization, :factory => :boardofrec end Organization_spec.rb: ... it "should have the user Johnny B. Badd" do boardofrec_with_users = Factory.create(:boardofrec_with_users) boardofrec_with_users.users.should include(Factory.create(:johnny)) end ... This example fails because the Organization.users list and the comparison User :johnny are separate instances of the same Factory. I realize this doesn't follow the BDD ideas behind what these plugins (FG, rspec) seemed to be geared for but seeing as this is my first rails application I'm uncomfortable moving forward without knowing that I've configured my associations and table structures properly.

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• How to set RAILS_ENV in Aptana Rad Rails?

  - by Hortitude

  I'm using Aptana RadRails, and it seems that whenever I do any rake tasks it is using the development environment. How do I tell it to use the production environment? (e.g. db:create sets up my development database. I know I could do a db:create:all, but I'm wondering how to set the environment.) Thanks!

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• Hash#key for 1.8.6

  - by Tobias

  Greetings, I am trying to make my 1.9.1 source 1.8.6 compatible. I recognized that there's no Hash#key method. Any idea or method how to solve that? Thanks! Tobias

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• Rails 2.3 uniqueness validation - how can I capture the value causing the error

  - by sa125

  Hi - I'm trying to capture the value that's throwing a uniqueness error (or for that matter, any other type of built-in validation) to display it in the :message option. Here's what I tried (didn't work) # inside the model validate_uniqueness_of :name, :message => "#{name} has already been taken" # also tried using #{:name} I could use a custom validation, but this beats the point of using something that's already integrated into AR. Any thoughts? thanks.

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• Odd Drag and drop sorting error Rails for nested attributes

  - by Senthil

  I've got this weird bug when trying to use drag and drag for two models (one nested within another). I've a category model which has many apps. In my category index page, I tried use "content_tag_for" to sort categories and apps within each category. But for some odd reason only the first element has drag, drop enabled. I can drag and drop categories all I want, but I can't drag the app in the second category, just the first category. Copy and paste gets ridiculously hopeless with HAML, so here's a Pastie instead. I made a sample app on heroku for you to check out here. Drag and drag work for both category and app, so I'm guessing it has to do something with the ul or li. Any help is appreciated. Thanks.

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• Passing multiple codeblocks as arguments

  - by doctororange

  I have a method which takes a code block. def opportunity @opportunities += 1 if yield @performances +=1 end end and I call it like this: opportunity { @some_array.empty? } But how do I pass it more than one code block so that I could use yield twice, something like this: def opportunity if yield_1 @opportunities += 1 end if yield_2 @performances +=1 end end and: opportunity {@some_other_array.empty?} { @some_array.empty? } I am aware that this example could be done without yield, but it's just to illustrate. Thanks.

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• Nested Forms not passing belongs_to :id

  - by Bill Christian

  I have the following model class Project < ActiveRecord::Base has_many :assignments, :conditions => {:deleted_at => nil} has_many :members, :conditions => {:deleted_at => nil} accepts_nested_attributes_for :members, :allow_destroy => true end class Member < ActiveRecord::Base belongs_to :project belongs_to :person belongs_to :role has_many :assignments, :dependent => :destroy, :conditions => {:deleted_at => nil} accepts_nested_attributes_for :assignments, :allow_destroy => true validates_presence_of :role_id validates_presence_of :project_id end and I assume the controller will populate the member.project_id upon project.save for each nested member record. However, I get a validation error stating the project_id is blank. My controller method: def create # @project is created in before_filter if @project.save flash[:notice] = "Successfully created project." redirect_to @project else render :action => 'new' end end Do I need to manually set the project_id in each nested member record? Or what is necessary for the controller to populate when it creates the member records?

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• Rails — Formtastic, how to set text for options in select?

  - by TJY

  f.input :some_model_values, :as => :select Using Formtastic, I need to set a text for options on my select input, but not populated from :some_model_values.

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• Rails - How can I display nicely indented JSON?

  - by sa125

  Hi - I have a controller action that returns JSON data for api purposes, and plenty of it. I want to be able to inspect it in the browser, and have it nicely indented for the viewer. For example, if my data is data = { :person => { :id => 1, :name => "john doe", :age => 30 }, :person => ... } I want to see { "person" : { "id" : 1, "name" : "john doe", "age" : 30, }, "person" : { "id" : 2, "name" : "jane doe", "age" : 31, }, ...etc } In the view. I thought about using different routes to get the bulk/pretty data: # GET /api/json # ... respond_to do |format| format.html { render :json => data.to_json } end # GET /api/json/inspect # ... respond_to do |format| format.html { render :text => pretty_json } end Anyone knows of a gem/plugin that does this or something similar? I tried using JSON.pretty_generate, but it doesn't seem to work inside rails (2.3.5). thanks.

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• How to show server errors in Rails 2.3.5 with JSON and jQuery

  - by Fortuity

  I've got in-place editing on a page in my app (using Rails 2.3.5 and jQuery). I want to know how to display an error on the page when the update fails. I'm using ajax (an XMLHttpRequest) to save an update to a Comment object. The controller has an update method like this: def update @comment = Comment.find(params[:id]) respond_to do |format| # if @comment.update_attributes!(params[:comment]) if false #deliberately forcing a fail here to see what happens format.json { render :nothing => true } else format.json { render :json => @comment.errors, :status => :unprocessable_entity } end end end In Firebug, I can see the server returns a "422" (an appropriate validation error status code). But it's a response to an XMLHttpRequest so there is no redirect to an error page. I think I actually want to do this: format.json { render :json => @comment.errors} or maybe this: format.json {render :json => { :status => :error, :message => "Could not be saved" }.to_json, :status => 400 } and trigger some Javascript function that iterates through (and displays) any errors. I'm using a rails plugin http://github.com/janv/rest_in_place/ to implement the in-place editing. It doesn't appear to have any callback function to handle a failure. What are my options? Can I write some Javascript to respond to a failure condition without hacking the plugin? Do I have to hack the rest_in_place plugin to handle a failure condition? Is there a better plugin (for Rails or jQuery) that handles in-place editing, including failure conditions? UPDATE This post from Peter Bui (http://paydrotalks.com/posts/45-standard-json-response-for-rails-and-jquery) was helpful in showing how to handle an error message from the server using XMLHttpRequest.status. I looked at his implementation of a blog using ajax (http://github.com/paydro/talks). I'm surprised at the complexity required to handle a simple error condition. Usually Rails has all the goodness baked in but it seems server errors with JSON are out of scope. Can that be? I also looked at grimen's validatious-on-rails (http://github.com/grimen/validatious-on-rails/) which accommodates models validations when ajax XMLHttpRequest is used. It's not clear to me how I'd use it to handle the general case of a "save" failing when validations succeed. P.S. Please vote me up... so I can use more than one HTML link when I ask my question :-)

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• Any working tutorials for Authlogic?

  - by Mark Wilbur

  I've been trying to build my first rails app and have gotten stuck on the issue of user authentication. I've found a number of tutorials for using various plug-ins to do this, but so far every single one of them is out-dated, and as a result, broken! From what I've read, I think Authlogic may be the best fit for me, and I've tried two things: 1) Going through Railscast, episode #160 (which is a tutorial for setting it up) 2) Using Ryan B's nifty_authentication gem with the --authlogic tag In both cases, I get the following error as soon as I try to do anything with a user: undefined local variable or method `acts_as_authentic' for # I believe this is from the User model: class User < ActiveRecord::Base acts_as_authentic end I'm sure I've installed the authlogic gem, and I've added config.gem "authlogic" to my environment.rb Any ideas about what's wrong? Anybody know of a complete and up to date tutorial for adding user authentication?

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• Is there anyway to make a Rails / Rack application tell the web server to drop the connection

  - by dasil003

  There are many security reasons why one would want to drop an HTTP connection with no response (eg. OWASP's SSL best practices). When these can be detected at the server level then it's no big deal. However, what if you can only detect this condition at the application level? Does Rails, or more generally Rack, have any standard way of telling the server to drop the connection without a response? If not, are there some standard headers to pass in that will accomplish that in common web servers (I'm thinking Nginx or Apache)? Even if there is not a standard header is there a reasonable way to configure that behavior? Is this a fool's errand?

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• Can Nokogiri Parse a Nokogiri Object?

  - by Jesse J

  I'm trying to parse a part of the result of a parse, like this: queries = @doc.xpath("//spectrum_query") queries.each do |query| hits = query.xpath("//search_hit") end But instead of Nokogiri only searching for search_hits inside the query, it searches for search_hits in the whole document. I'm sure there's a different way to accomplish what I want, but doing it like this would be the simplest. Anyone know if it's possible to search just the query object?

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• Compass Rails 3.0 working with 'compass watch' but not without

  - by Mike Blyth

  I'm trying Compass with Rails 3.0.7, just trying to get started. Using gem compass-rails. If I put my sass file in app/assets/stylesheets and run 'compass watch', everything works ok: the compiled css is put into public/stylesheets. However, if I stop 'watch' and rely on Rails to do the compilation, it does not work. Instead, the program looks at the public/stylesheets/sass folder for the input. Furthermore, if a file in that folder has the '@include "compass"' directive, I get an error that the file is not found. How do I force Rails to look in the right place -- app/assets/stylesheets?

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• Building simple Reddit scraper

  - by Bazant Fundator

  Let's say that I would like to make a collection of images from reddit for my own amusement. I have ran the code on my development env and It haven't gone past the first page of posts (anything beyond requries the after string from the JSON. Additionally, When I turn on the validation, the whole loop breaks if the item doesn't pass it, not just the current iteration. I would be glad If you helped me understand mistakes I made. class Link include Mongoid::Document include Mongoid::Timestamps field :author, type: String field :url, type: String validates_uniqueness_of :url, # no duplicates validates :url, uniqueness :true end def fetch (count, after) count_s = count.to_s # convert count to string link = "http://reddit.com/r/aww/.json?count="+count_s+"&after="+after #so it can be used there res = HTTParty.get(link) # GET req. to the reddit server json = JSON.parse(res.body) # Parse the response if json['kind'] == "Listing" then # check if the retrieved item is a Listing for i in 1...(count) do # for each list item datum = json['data']['children'][i]['data'] #i-th element properties if datum['domain'].in?(["imgur.com", "i.imgur.com"]) then # fetch only imgur links Link.create!(author: datum['author'], url: datum['url']) # save to db end end count += 25 fetch(count, json['data']['after']) # if it retrieved the right kind of object, move on to the next page end end fetch(25," ") # run it

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