Ruby on Rails Q & A

 

How to deploy a Rails app to Heroku?

Heroku is a cloud platform that provides easy deployment, scaling, and management of web apps. Deploying a Rails application to Heroku is a straightforward process, facilitated by the tight integration between Rails and Heroku’s platform. Here’s how you can achieve this:

 

  1. Preparation:

   – Ensure you have Git installed, as Heroku uses Git for deployment.

   – Sign up for a Heroku account and install the Heroku CLI (Command Line Interface).

   – Log in to Heroku using the command: `heroku login`.

 

  1. Database Configuration: Heroku uses PostgreSQL, so ensure your Rails app is set up to use it, especially in the `Gemfile`:
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```ruby
group :production do
gem 'pg'
end
```
```ruby group :production do gem 'pg' end ```
```ruby

group :production do

  gem 'pg'

end

```

 

Run `bundle install` afterward.

 

  1. Initialize Git: If your Rails app isn’t already under Git version control, initialize it:
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```bash
git init
git add .
git commit -m "Initial commit"
```
```bash git init git add . git commit -m "Initial commit" ```
```bash

git init

git add .

git commit -m "Initial commit"

```

 

  1. Create a Heroku App: Run the following command to create a new Heroku application:
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```bash
heroku create
```
```bash heroku create ```
```bash

heroku create

```

 

This command creates a new app on Heroku and adds a Git remote named “heroku” to your local Git repository.

 

  1. Set Environment Variables: If your Rails app uses environment variables, you can set them on Heroku with:
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```bash
heroku config:set MY_VARIABLE=value
```
```bash heroku config:set MY_VARIABLE=value ```
```bash

heroku config:set MY_VARIABLE=value

```

 

  1. Assets Compilation: Ensure the assets get precompiled by adding the following to `config/application.rb`:
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```ruby
config.assets.initialize_on_precompile = false
```
```ruby config.assets.initialize_on_precompile = false ```
```ruby

config.assets.initialize_on_precompile = false

```

 

  1. Deploy to Heroku: Deploy your application with:
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```bash
git push heroku master
```
```bash git push heroku master ```
```bash

git push heroku master

```

 

  1. Migrate Database: Since Heroku doesn’t automatically run migrations, execute them with:
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```bash
heroku run rake db:migrate
```
```bash heroku run rake db:migrate ```
```bash

heroku run rake db:migrate

```

 

  1. Visit Your App: Your app should now be live. You can open it in the web browser with:
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```bash
heroku open
```
```bash heroku open ```
```bash

heroku open

```

 

Deploying a Rails app to Heroku is a seamless process. Make sure to regularly push updates, monitor the app’s performance, and scale resources as needed through the Heroku dashboard or CLI.

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Senior Software Engineer with a focus on remote work. Proficient in Ruby on Rails. Expertise spans y6ears in Ruby on Rails development, contributing to B2C financial solutions and data engineering.