Heroku push rejected - Hartl's Rails 3.2 tutorial - ruby-on-rails

Question

I am a ruby, ruby on rails and heroku greenhorn, which is trying to learn to code from Michael Hartl's Ruby on Rails 3.2 tutorial.
Now at the very beginning of this chapter I failed to deployed all to Heroku. This error message I got (but I have no plan what to do to solve this problem):
$ git push heroku master
Counting objects: 69, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (54/54), done.
Writing objects: 100% (69/69), 27.34 KiB, done.
Total 69 (delta 5), reused 0 (delta 0)
-----> Heroku receiving push
-----> Ruby/Rails app detected
-----> Installing dependencies using Bundler version 1.2.0.rc
Running: bundle install --without development:test --path vendor/bundle --binstubs bin/
Fetching gem metadata from https://rubygems.org/........
Bundler could not find compatible versions for gem "railties":
In Gemfile:
rails (= 3.2.6) ruby depends on
railties (= 3.2.6) ruby
jquery-rails (= 2.0.0) ruby depends on
railties (3.2.7.rc1)
!
! Failed to install gems via Bundler.
!
! Heroku push rejected, failed to compile Ruby/rails app
To git#heroku.com:pacific-anchorage-8098.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'git#heroku.com:pacific-anchorage-8098.git'
My Gemfile looks like this:
source 'https://rubygems.org'
gem 'rails', '3.2.6'
# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'
group :development, :test do
gem 'sqlite3', '1.3.5'
gem 'rspec-rails', '2.10.0'
end
# Gems used only for assets and not required
# in production environments by default.
group :assets do
gem 'sass-rails', '3.2.4'
gem 'coffee-rails', '3.2.2'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', :platforms => :ruby
gem 'uglifier', '1.2.3'
end
gem 'jquery-rails', '2.0.0'
group :test do
gem 'capybara', '1.1.2'
end
group :production do
gem 'pg', '0.12.2'
end
# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'
# To use Jbuilder templates for JSON
# gem 'jbuilder'
# Use unicorn as the app server
# gem 'unicorn'
# Deploy with Capistrano
# gem 'capistrano'
# To use debugger
# gem 'debugger'
I hope someone could help me out (sorry, I am a beginner --> also at Stackoverflow, lol).
KR, Fabian

Answer 1

The default generated Gemfile (with rails 3.2.6) does not specify a jquery-rails version to use. I would recommend doing the same, like so:
# remove version number, just like you would see in a fresh rails app
gem 'jquery-rails'
The version you have required, 2.0.0, relies on railties 3.2.7.rc1 gem, which you can't use with rails 3.2.6.
I used your code in my app, and couldn't get it to bundle on my local host. This makes me wonder if you tried that too yourself before pushing to heroku. You should always bundle install on your local machine first.
Also, you appear to have bumped the required version numbers of sass-rails and coffee-rails. Here's what you'd expect in a clean rails app's Gemfile:
# Gems used only for assets and not required
# in production environments by default.
group :assets do
gem 'sass-rails', '~> 3.2.3'
gem 'coffee-rails', '~> 3.2.1'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', :platforms => :ruby
gem 'uglifier', '>= 1.0.3'
end
gem 'jquery-rails'

Answer 2

I could now solve the problem by myself. This was the way:
Go to Gemfile and change the section with gem 'rails', '3.2.6' to gem 'rails', '3.2.7rc1'.
save
run bundle install --without production
run git add .
commit to git like git commit -a -m "Heroku recommit
push to github like git push and follow the instruction for username and password
and last git push heroku master
Wow, this was hard, but very educational :-)

Answer 3

The problem is the jquery-rails gem needs a different version of railties than the rails gem in your bundle file. You can try to remove the "2.0.0" from jquery-rails and try again. Bundle will install a version of the gem which works wit version 3.2.6 of railties.