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heroku_deployment_notes.md

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Deploying through Heroku

  1. Go to heroku and sign up

  2. then go to: [https://devcenter.heroku.com/articles/getting-started-with-rails6] and install heroku cli tool brew tap heroku/brew && brew install heroku for mac and for linux sudo snap install --classic heroku 👈 if this command does not work for ubuntu, scroll further down at the page and you will see curl https://cli-assets.heroku.com/install-ubuntu.sh | sh run it, which we are running things from internet, which is an http request to install-ubuntu and we are piping it to 'sh'. You have to be careful when you do that, I trust heroku but, they could have been hacked, who knows. Note: follow the steps to run and login heroku in your terminal - heroku autocomplete --refresh-cache then - heroku autocomplete

  3. Deploying to heroku steps: After installing heroku cli tool, we can:

    1. login in terminal by running heroku login which will redirect us to browser and once you login there, the logging in will be done in your local terminal too
    2. Dealing with database

    In the config folder there is database.yml file (yml: Yet another Markup Language) which is whitespace sensitive like python so anything indented below something, it belongs to it like a JSON object but, it does not use curly braces or quotations /config/database.yml and from this link (https://devcenter.heroku.com/articles/getting-started-with-rails6) go down to find database.yml configuration for production mode

    Note: if you are using sqlite gem instead of postgres(pg), you will need to use pg for production so, move the sqlite gem into development gems and add pg to production group gems then do bundle install if bundle install fails and asks for installing postgres header files which is libpg-dev then run the following commands: cd ~ sudo apt-get update sudo apt-get upgrade sudo apt-get install zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev libffi-dev libpq-dev

    1. run heroku create command which creates some random sub-domain at heroku.com but, we can also request a particular name by running heroku apps:create <a-unique-name> then visit the link that is generated which is where our app is going for deployment.

    2. Now if you run git remote -v, you have a remote now called heroku as well so:

      1. to push to github run: git push origin master
      2. to push to heroku run: git push heroku master

      so go ahead and push it to heroku. So that, take all my code and push it to heroku. and then heroku has got some git hooks in place where it is detecting that it is a ruby app specifically rails and start installing my gems, so, it is going into my GemFile and install gems. It will then detect my package.json file and will do yarn install and install any javascript dependencies that are required

    3. With heroku command we can run all rails commands like

      1. heroku run rails db:prepare 'prepare' is a new rails command which if the database does not exist, it gonna create it and appropriate tables not by stepping through our migrations but, by looking at our database schema file and make them all at once
      2. heroku run rails db:seed