I’ve always wondered which argument pass to validates method for model which hash belongs_to association: association name or field name (Rails names it as a foreign_key). Do you know? Have you ever been asked this question? I know the answer for this question and of course I will share my idea with you in this post. Association name of foreign key? Assume we have to models: Account and User. Acco
Similar to most web applications that don't have millions of users, our simple server architecture sufficed for the first couple years of our company. Two front-end servers (EC2 instances), one load balancer, and one database server (RDS instance). Apart from the occasional press hit where we had to fire up five or six additional front-end servers, this setup served us well. Up until recently. Hav
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I was bouncing around the Rails API documentation yesterday, and I noticed a few rails console tricks I haven’t seen before. There’s been plenty of posts about irb and Rails before, but I’m hoping you’ll learn something new here. The following console samples were taken with Basecamp Next on Rails version 3.2.3. Dive into your app Running the app method in rails console gives you an integration se
I tried to establish connection to my aws s3 account like this in my irb console - AWS::S3::Base.establish_connection!(:access_key_id => 'my access key', :secret_access_key => 'my secret key', :server => "s3-ap-southeast-1.amazonaws.com") And it works well and prompt this - => #<AWS::S3::Connection:0x8cd86d0 @options={:server=>"s3-ap-southeast-1.amazonaws.com", :port=>80, :access_key_id=>"my acces
I'm in the process of maintaining a Ruby on Rails app and am looking for an easy way to find the hostname or IP address of the box I'm on (since it's a VM and new instances may have different hostnames or IP addresses). Is there a quick and easy way to do this in Ruby on Rails? Edit: The answer below is correct but the clarification Craig provided is useful (see also provided link in answer): The
I have an observer and I register an after_commit callback. How can I tell whether it was fired after create or update? I can tell an item was destroyed by asking item.destroyed? but #new_record? doesn't work since the item was saved. I was going to solve it by adding after_create/after_update and do something like @action = :create inside and check the @action at after_commit, but it seems that t
Register the TSV Mime Type in `config/initializers/mime_types.rb` register the TSV mime type Mime::Type.register "text/tab-separated-values", :tsv Add to_csv and to_tsv to Arrays so as CSV and TSV renderers In `lib/csv_and_tsv_renderers.rb` # encoding: utf-8 # require 'csv' # adds a .to_csv method to Array instances class Array BOM = "\xEF\xBB\xBF" #Byte Order Mark UTF-8 alias old_to_csv to_csv #k
I'm excited to announce that I am a co-author of The Rails 4 Way alongside Obie Fernandez himself. Read More A lot of Ruby developers are familiar with queues, such as DelayedJob and Resque. While these queues have been predominant the last couple of years, my tool of choice is Sidekiq, a Redis backed queue by Mike Perham. Sidekiq advertises that a single process can do the work of 20 Resque or De
The design I have a User model that belongs to a profile through a polymorphic association. The reason I chose this design can be found here. To summarize, there are many users of the application that have really different profiles. class User < ActiveRecord::Base belongs_to :profile, :dependent => :destroy, :polymorphic => true end class Artist < ActiveRecord::Base has_one :user, :as => :profile
Recently I’ve been working on a Rails application that supports subdomains. I’m using Devise for user authentication and need the user to choose a subdomain to use upon registration. Similar to the 37signals applications, I want a single sign-on to be persistent across subdomains. Since I didn’t have a clue where to begin with subdomains, I followed this tutorial on my new Rails 3.1 beta 1 applica
I have a default scope on products due to information security constraints. class Product < ActiveRecord::Base has_many :photos default_scope where('visible = 1') end In my associated Photo model, however, I also have to find products that should not be visible. class Photo < ActiveRecord::Base belongs_to :product end my_photo.product In other cases, I can use unscoped in order to bypass the defau
I'm using an array to generate the path for my rails link_to tags and can't seem to figure out how to add an anchor option. Here are my link_to tags: <%= link_to pluralize(post.comments.count, 'comment'), [post.postable, post] %> <%= link_to "Leave a comment", [post.postable, post] %> Since I'm using a polymorphic association for the posts (and they are nested routes), I can't simply use the paths
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