I see many project get nested routes wrong. Developers do not use Ruby modules to reflect the relationship between the parent and children nesting of controllers. Here is an example of the wrong way (IMHO). Let’s say we have a customer and the customer has_many orders and has_one profile. Some developers will represent it like this.

/customers path in the file app/controllers/customers_controller.rb

class CustomersController < ApplicationController
  def index
    ...
  end
end

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The simplest way to test validates_attachment_file_name and validates_attachment_content_type configurations of the Rails model that has a paperclip attachment is to use the allow_value method in the shoulda gem.

The following example uses rspec to demonstrate.

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Will_paginate and Kaminari are both popular Ruby Gems for displaying and parsing pagination in a Ruby on Rails application. I won’t wade into the seething cauldron of debate about which is better suited for the task.

To center the will_paginate pagination links, do the follow.

<div class="pagniation-wrapper">
  <%= will_paginate @accounts %>
</div>

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Issues I have found when doing Ruby on Rails upgrades of Ruby version 1.8.7 to 2.2 or 2.1:

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I have three different ways of getting files from other branches.

1) Checkout the file from the other branch

git checkout other-branch app/views/customers/index.html.erb

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If you are using cloudfront with Heroku, chances are you will encounter some problems if you are using something like font-awesome. I won’t go into the details of how to setup cloudfont, but your heroku passenger should have the following. First, read the Passenger Documentation for Nginx configuration template.

These are the correct steps:

1. Copy the default ngnix config

Do this in the root directory of your Rails application.

cp $(passenger-config about resourcesdir)/templates/standalone/config.erb config/passenger_config.erb

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Let’s take a very simple Ruby hash with some US state abbreviations to their names

us_states = {
  'AK' => 'Alaska',
  'AL' => 'Alabama',
  'AR' => 'Arkansas',
  'AZ' => 'Arizona',
  'CA' => 'California',
  'CO' => 'Colorado',
  'CT' => 'Connecticut'
}

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I recently ran into this following code in a project that I inherited:

def get_company_doc_file(company_doc)
  if Rails.env.development?
    company_doc.company_file.path
  else
    company_doc.company_file.url
  end
end

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Recently, I have installed browserify-rails and react-rails together in the same Ruby on Rails project. This give the best of both worlds since I can still use the react_component helper provided by react-rails but use npm to manage my versions of different React.js components. However, if you install react-rails, make sure you do not run any of the generators.

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The relationship between NPM and Node.js is always blurry to me. Whenever I have to upgrade my version of node, I am always a little confused so I’m adding this here for reference:

Before:

$ node --version
v5.8.0

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