Uploading multiple files with Carrierwave in Rails 4

This post shows how to use carrierwave gem to upload multiple files in Rails 4 Let suppose the following scenario. We have multiple projects and each project can have multiple screenshots. In project.rb class Project < ActiveRecord::Base has_many :screenshots accepts_nested_attributes_for :screenshots, :allow_destroy => true end In screenshot.rb class Screenshot < ActiveRecord::Base belongs_to :project mount_uploader :image, ScreenshotUploader […]

Using has_many with Nested Form in Rails 4

This post shows how to use field_for and accepts_nested_attributes_for to created nested form for has_many model Let suppose the following scenario. We have multiple projects and each project can have multiple screenshots. Following will be the definition of model classes. class Project < ActiveRecord::Base has_many :screenshots end class Screenshot < ActiveRecord::Base belongs_to :project end Now while […]

Using Twitter Bootstrap with Ruby on Rails

Step by step guide to integrate Twitter Bootstrap with Ruby on Rails application. Please note that after these steps, your application layout file will be replaced with default one. Step1: Add gem to your Gemfile gem 'twitter-bootstrap-rails' Step 2: Install required gem. To do that, on terminal, run bundle install Step 3: Run bootstrap install scripts […]

Error installing debugger gem on ubuntu

I recently encountered error while bundle install. The issue was with debugger gem. Following is the error I was getting No source for ruby-1.9.3-p484 provided with debugger-ruby_core_source gem. extconf.rb failed After searching Google for answer, I found that this gem depends upon another one named "debugger-ruby_core_source" as specified in error. So to successfully install debugger, […]

500 error with rails application running in production via apache2 & passenger

I sometimes face 500 Internal Server Error when running Ruby on Rails application on Apache Passenger but the same application is working fine with webrick server. One of the following reasons are responsible for the issue. 1. Permission Issues Check permission of the files and directories of your project. It should be writeable by the […]

Enum column in Rails

Declare an enum attribute where the values map to integers in the database, but can be queried by name. Example: class User < ActiveRecord::Base enum status: [ :admin, :user, :banned ] end  For migration, write  def up create_table :authorities do |t| t.string ‘value’, :default => ”, :null => false t.integer :status end end  

Upgrade Redmine

Login to your server using putty Go to RubyForge and copy the URL of Redmine version you want to upgrade to. Download it to your server using wget command. Go to Redmine Site to check the requirements. Make sure you have all the required versions of gems installed. Please note that Rails 2.3.5 will fail […]