#gemfile

Every day, a curious developer and tech enthusiast never misses an opportunity to learn something new! This desire to study is something I understand. So, with your curiosity in mind, we're back with another Rails tutorial on using Docker Compose to a dockerize rails app. I hope you're familiar with what Docker is and why we need it.

Let's get started on developing and dockerizing the app.

Create a Rails App

Prerequisites: Dockerize Rails Application

As we are implementing Docker Compose, make sure about the following installations before getting started.

Install Docker Community Edition

Install Docker Compose

Create a Dockerfile for rails developer

Define Services Using Docker Compose

Build the Project

Database Connection

Summary: How to Dockerize Rails Application

mkdir ~/projects/noteapp

cd ~/projects/noteapp

Create Gemfile and empty Gemfile.lock (content is given above)

Create Dockerfile (content is given above)

Create docker-compose.yml (content is given above)

docker-compose run app rails new . –force –database=mysql

Make changes in config/database.yml

docker-compose build

docker-compose up

http://localhost:3001

docker-compose run –rm app rails g scaffold note title body:text

docker-compose run –rm app rake db:migrate

http://localhost:3001/notes

The Cucumber book : Could not locate gemfile

I’m reading “The cucumber book” and at page 143 it is given an example of “bundle exec ruby lib/nice_bank.rb”

This gives me an errormessage of could not locate gemfile.

I have searched up and down, but can’t find it anywhere manually.

I then did the following command in the Console: gem list

And then I get a list of many installed gems, including cucumber, sinatra and capybara, which is listed…

What’s wrong with my Gemfile?

I tried to bundle install, but here is what I got:

/home/dcaclab/.rvm/rubies/ruby-1.9.3-p362/lib/ruby/site_ruby/1.9.1/rubygems/version.rb:187:in `initialize': Malformed version number string = 1.0.3 (ArgumentError) /home/dcaclab/.rvm/gems/ruby-1.9.3-p362@global/gems/bundler-1.2.3/lib/bundler/lockfile_parser.rb:104:in `new'…

How to use Sidekiq-Pro with a public repo..with Heroku

Only because we didn't try it anywhere else.

tldr;

TLDR Solution

Story behind problem

In a recent project in which we are using a public repo we made the mistake of including our source url for access to the Sidekiq-Pro Gem within minutes Mark Perham was knocking our digital door(email) giving us a wag of the finger.

We where then faced with a dilemma the client insisted we kept an open repo but we needed the power of sidekiq-pro. Having to edit in the url into our Gemfile everytime we pulled from Git would be a pain.

After much googling and StackOverflow no simple answer bubbled up. It wasn't until we came across this RubyGems Doc -Gem Sources

Solution:

Just create a .gemrc in root of the rails app directory, remove the source url from the gemfile and add the source like so.

./.gemrc

sources: - https://user:[email protected]/

This solved our problem in development and keeping the repo open but then we came across another issue in that our heroku server wouldn't build becuase bundle wouldn't pass after some experimentation we found out that the Enviroment Variables are available at the start of each build and since a Gemfile is just ruby anyway.

./Gemfile

# If production use sidekiq pro url if ENV['RACK_ENV'] == 'production' gem 'sidekiq-pro', :source => "https://#{ENV['sidekiq_url']}" else gem 'sidekiq-pro', '~> 1.9.2' end

Tldr Solution

./.gemrc

sources: - https://user:[email protected]/

./Gemfile

Solution: Bundler: What does :require => false in a Gemfile mean? #development #dev #solution

Bundler: What does :require => false in a Gemfile mean?

The line is this one:

gem 'whenever', :require => false

Does it means that the gem needs to be installed or is not required?

Answer [by Rob Di Marco]: Bundler: What does :require => false in a Gemfile mean?

This means install the gem, but do not call require when you start Bundler. So you will need to manually call

require "whenever"

if…

How to: Bundler: What does :require => false in a Gemfile mean?

Bundler: What does :require => false in a Gemfile mean?

The line is this one:

gem 'whenever', :require => false

Does it means that the gem needs to be installed or is not required?

Answer: Bundler: What does :require => false in a Gemfile mean?

This means install the gem, but do not call require when you start Bundler. So you will need to manually call

require "whenever"

if you want to use…