rails docker app bundle rake aborted - ruby-on-rails

Question

I'm trying to create a Rails app using docker and am getting an error during my initial docker build. I've been following various tutorials to try to get this to work, but am not having any luck.
My error:
Step 10/12 : RUN bundle exec rake RAILS_ENV=production DATABASE_URL=postgresql://user:pass#127.0.0.1/neo SECRET_TOKEN=foobar assets:precompile
---> Running in d3d282e3eb8b
/usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:51: warning: constant ::Fixnum is deprecated
/usr/local/bundle/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:52: warning: constant ::Bignum is deprecated
rake aborted!
NoMethodError: undefined method `split' for nil:NilClass
/app/config/application.rb:57:in `<class:Application>'
/app/config/application.rb:10:in `<module:NeoDocker>'
/app/config/application.rb:9:in `<top (required)>'
/app/Rakefile:5:in `require_relative'
/app/Rakefile:5:in `<top (required)>'
/usr/local/bundle/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
/usr/local/bin/bundle:23:in `load'
/usr/local/bin/bundle:23:in `<main>'
(See full trace by running task with --trace)
The command '/bin/sh -c bundle exec rake RAILS_ENV=production DATABASE_URL=postgresql://user:pass#127.0.0.1/neo SECRET_TOKEN=foobar assets:precompile' returned a non-zero code: 1
Dockerfile:
FROM ruby:2.4.1
RUN apt-get update && apt-get install -qq -y --no-install-recommends \
build-essential nodejs libpq-dev
ENV INSTALL_PATH /app
RUN mkdir -p $INSTALL_PATH
WORKDIR $INSTALL_PATH
COPY Gemfile Gemfile.lock ./
RUN bundle install --binstubs
COPY . .
RUN bundle exec rake RAILS_ENV=production DATABASE_URL=postgresql://user:pass#127.0.0.1/neo SECRET_TOKEN=foobar assets:precompile
VOLUME ["$INSTALL_PATH/public"]
CMD puma -C config/puma.rb
My Gemfile is pretty much the default for Rails 5 now:
source 'https://rubygems.org'
gem 'rails', '~> 5.0.1'
gem 'puma', '~> 3.0'
gem 'rack-timeout', '~> 0.4'
gem 'jbuilder', '~> 2.5'
gem 'pg', '~> 0.18'
gem 'redis-rails', '~> 5.0.0.pre'
gem 'sidekiq', '~> 4.2'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'jquery-rails'
gem 'turbolinks', '~> 5'
gem 'bootstrap-sass', '~> 3.3'
gem 'font-awesome-rails', '~> 4.7'
group :development, :test do
gem 'byebug', platform: :mri
end
group :development do
gem 'rack-mini-profiler', '~> 0.10'
gem 'web-console', '~> 3.3.0'
gem 'listen', '~> 3.0.5'
gem 'spring'
gem 'spring-watcher-listen', '~> 2.0.0'
end
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
What's wrong here?

Answer 1

I think you solve your problem but maybe the answer help someone
The warning you can try solving updating Rails in your Gemfile, changing:
gem 'rails', '~> 5.0.1'
by
gem 'rails', '~> 5.0.2'
and then execute bundle update rails (I don't know if in Docker is necesary)
Also maybe you can have an error in your /app/config/application.rb file in line 57

Answer 2

Here is your solution.
https://github.com/giapnhdev/rails-base
It includes some awesome gems for your project like:
devise, seed_fu, shrine,...