I recently received a question from one of my readers how to deploy something existing (on Github) to Heroku. He noticed that I was posting most of my code on Github, but he wanted to know how to get it off Github and deploy to Heroku.
In this post, we have created a REST API for our todo app. Let’s take this as an example. Here we go…
The code from that post can be found on Github (https://github.com/wiwa1978/blog-sinatra-todo-postgres-datamapper-structure-json). We use git clone to grab a copy for making some local changes.
wim@wim-mint ~/ $ git clone https://github.com/wiwa1978/blog-sinatra-todo-postgres-datamapper-structure-json.git Cloning into 'Sinatra-Todo-app-with-Datamapper-using-Postgres-and-JSON'... remote: Counting objects: 43, done. remote: Compressing objects: 100% (39/39), done. remote: Total 43 (delta 0), reused 43 (delta 0) Unpacking objects: 100% (43/43), done. Checking connectivity... done.
You will see that a new directory has been created called ‘Sinatra-Todo-app-with-Datamapper-using-Postgres-and-JSON.gitCloning’. Go into that directory and do the following:
wim@wim-mint ~/Sinatra-Todo-app-with-Datamapper-using-Postgres-and-JSON $ heroku create todo-restserver Creating todo-restserver... done, stack is cedar http://todo-restserver.herokuapp.com/ | email@example.com:todo-restserver.git Git remote heroku added
To add the postgres database, do the following
wim@wim-mint ~/Sinatra-Todo-app-with-Datamapper-using-Postgres-and-JSON $ heroku addons:add heroku-postgresql Adding heroku-postgresql on todo-restserver... done, v4 (free) Attached as HEROKU_POSTGRESQL_ONYX_URL Database has been created and is available ! This database is empty. If upgrading, you can transfer ! data from another database with pgbackups:restore. Use `heroku addons:docs heroku-postgresql` to view documentation.
You also see in the previous CLI output, that Heroku makes available the database location in the environment variable “HEROKU_POSTGRESQL_ONYX_URL”. We can now change the database location in our application’s main.rb file:
configure :production do DataMapper.setup( :default, ENV['HEROKU_POSTGRESQL_ONYX_URL'] ) end
This will tell our application to store all todo items in the Postgres database located at the URL as specified in the environment variable ENV[‘HEROKU_POSTGRESQL_ONYX_URL’].
wim@wim-mint ~/Sinatra-Todo-app-with-Datamapper-using-Postgres-and-JSON $ git push heroku master Initializing repository, done. Counting objects: 47, done. Compressing objects: 100% (43/43), done. Writing objects: 100% (47/47), 88.46 KiB | 0 bytes/s, done. Total 47 (delta 3), reused 0 (delta 0) -----> Ruby app detected -----> Compiling Ruby/Rack -----> Using Ruby version: ruby-2.0.0 -----> Installing dependencies using 1.6.3 Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment The source :rubygems is deprecated because HTTP requests are insecure. Please change your source to 'https://rubygems.org' if possible, or 'http://rubygems.org' if not. Fetching gem metadata from http://rubygems.org/......... Installing addressable 2.3.6 Installing fastercsv 1.5.5 Installing json_pure 1.8.1 Installing multi_json 1.10.0 Installing stringex 1.5.1 Installing uuidtools 2.1.4 Installing rack 1.5.2 Installing json 1.8.1 Using bundler 1.6.3 Installing tilt 1.4.1 Installing bcrypt-ruby 3.1.1 Installing data_objects 0.10.14 Installing rack-protection 1.5.3 Installing dm-core 1.2.1 Installing dm-aggregates 1.2.0 Installing sinatra 1.4.5 Installing dm-constraints 1.2.0 Installing dm-migrations 1.2.0 Installing dm-serializer 1.2.2 Installing dm-timestamps 1.2.0 Installing dm-transactions 1.2.0 Installing dm-types 1.2.2 Installing dm-validations 1.2.0 Installing dm-do-adapter 1.2.0 Installing sinatra-flash 0.3.0 Installing datamapper 1.2.0 Installing do_postgres 0.10.14 Installing dm-postgres-adapter 1.2.0 Your bundle is complete! Gems in the groups development and test were not installed. It was installed into ./vendor/bundle Bundle completed (8.50s) Cleaning up the bundler cache. ###### WARNING: You have not declared a Ruby version in your Gemfile. To set your Ruby version add this line to your Gemfile: ruby '2.0.0' # See https://devcenter.heroku.com/articles/ruby-versions for more information. ###### WARNING: No Procfile detected, using the default web server (webrick) https://devcenter.heroku.com/articles/ruby-default-web-server -----> Discovering process types Procfile declares types -> (none) Default types for Ruby -> console, rake, web -----> Compressing... done, 13.7MB -----> Launching... done, v6 http://todo-restserver.herokuapp.com/ deployed to Heroku To firstname.lastname@example.org:todo-restserver.git * [new branch] master -> master
Going to http://todo-restserver.herokuapp.com/ will result in a “500 Internal Server Error”. This was somehow expected as we still need to create the database on Heroku:
wim@wim-mint ~/Sinatra-Todo-app-with-Datamapper-using-Postgres-and-JSON $ heroku run rake migrate Running `rake migrate` attached to terminal... up, run.5342 The source :rubygems is deprecated because HTTP requests are insecure. Please change your source to 'https://rubygems.org' if possible, or 'http://rubygems.org' if not.
If you now go to http://todo-restserver.herokuapp.com/, you will get the . Again this was expected, as the database was just created and there are no records inserted yet.
In some of the next posts, we will create a REST client that consumes this REST webservice on http://todo-restserver.herokuapp.com.