Handle image upload and management painlessly with Carrierwave and Cloudinary and deploy on Heroku and share your photos fast with the world.

Hi everyone, today I’m going to show you how to do image share and upload in your Rails 5 application very easily. This is what I have learned by browsing several outdated tutorials, blog posts and a bunch of documentation. Most of the articles out there are older Rails version 4 so, I hacked together the steps for integrating into Rails 5 which I’m currently using on some of the projects and continue to use more. Plus in the process, we are going to build an imgur clone today by adding all the CRUD (Create, Read, Update, Delete) functionalities.

It is going to be a 2 part series explaining every bits and pieces. This tutorial is going to very beginner friendly and also suitable to intermediate to advanced users.

Now, let’s start some coding, shall we?

First, let’s create a new rails project in your terminal by doing:

rails new rimgur

It’s always good practice to start using Git right away so, we are going to follow the same practice here:

git init git add . git commit -m ‘project init’

Let’s test our app in the browser by using this command to boot up our server.

rails server

And then go to localhost:3000 in your browser. You will see this.

Rails default home

Great, your app is running successfully. Open the project in your favorite IDE or text editor.

Now we are going to create a controller.

rails generate controller pics

Open file *pics_controller.rb and an action **index*

**class PicsController < ApplicationController
    def *index 
    *end
end**

Create a view file for our index action in app/views/pics/index.html.erb

Open index.html.erb and write some dummy text like “Hello”

Now, we are going to create a route to display the page.

Go to config/routes.rb and write this.

**Rails**.**application**.**routes**.**draw do
    root 'pics#index'
end**

Okay, this line simply means you are setting root path to pic controller and index action.

And you should “Hello” or whatever you wrote.

Now, we are going to create our model like this.

rails generate model Pic

Awesome, now we have some routes and model setup and now we can start integrating our image handling system.

First, open your Gemfile and then put these right anywhere in middle.

**gem 'carrierwave'
gem 'cloudinary'**

Second, run bundle in your terminal to install the gems and then restart your server.

Third, we will generate our image uploader like this.

rails generate uploader Image

Go to app/uploaders/image_uploader.rb and add this inside our class.

**include Cloudinary::CarrierWave**

And comment out everything else in the file. IMPORTANT!

Now, create a new file in the config/initializers directory name cloudinary.rb and then add this.

**Cloudinary**.**config do |*config*|
    *config***.**cloud_name = ENV**[**'CLOUDINARY_CLOUD_NAME'**]
    ***config***.**api_key = ENV**[**'CLOUDINARY_API_KEY'**]
    ***config***.**api_secret = ENV**[**'CLOUDINARY_API_SECRET'**]
**end
**

Okay, let me explain this. We are adding all the configuration variables dynamically and securely. I’ll explain later more in details.

Open app/models/pic.rb and then put this.

**class Pic < ApplicationRecord
    mount_uploader :image**, **ImageUploader
end**

And then run rails db:migrate to add our schema. Your db/schema.rb should have something like this:

**create_table "pics"**, **force**: **:cascade do |*t*|
  *t***.**datetime "created_at"**, **null**: **false
  *t***.**datetime "updated_at"**, **null**: **false
end**

Now we’’ll generate a migration to add our image uploader to pic model.

rails generate migration add_image_to_pic

Open your <timestamp>_add_image_to_pic.rb and add this.

**class AddImageToPic < ActiveRecord**::**Migration**[**5.0**]
    **def *change
        *add_column :pics**, **:image**, **:string
    end
end**

And then run rails db:migrate to add it to our schema.

Great, our database part is done and now we going to add CRUD functionalities to our app.

Open your routes.rb file like this

**resources :pics**

Let’s check our routes by doing rails routes in your terminal. And you should all the actions routes.

Create all the action methods like this in your pics_controller.rb

**class PicsController < ApplicationController
  def *index
  *end

  def new
  end

  def *create
  *end

  def *edit
  *end

  def *show
  *end

  def *update
  *end

  def *destroy
  *end
end**

Thanks, everyone for reading it so far, hope you enjoyed it. In the next part, we will finish our application and also take it live. See you, in the next one.