Easy File Uploading in Rails

Aloha!

Rails provides Active Storage that makes it easy to attach files to records. Records as in @post object here.

Let's attach an image to a Post instance.

It's simple.

# app/models/post.rb

class Post < ApplicationRecord
  # ...
  has_one_attached :avatar
  # has_many_attached :object for multiple attachments
end

Before we do anything we have to setup active storage in our Rails application.

Run the following commands:

rails active_storage:install
rails db:migrate

# On running these commands rails creates and uses three tables :active_storage_blobs, :active_storage_variant_records and :active_storage_attachments which creates a record_id for every attached files by referring to the ***Class Name*** and it's instances.

For further reference: edgeguides.rubyonrails.org/active_storage_o..

Now we can simply attach an avatar image to @post by adding file_field to the form:

# app/views/posts/new.html.erb
   # ...
  <% = form.file_field :avatar %>
  # ...

You are displayed a file upload option in the webpage where you can upload it to the server.

What if you want to upload these attachments to a cloud service and not locally?

# config/environments/development.rb

config.active_storage.service = :local

# Change from :local to :amazon or :google or whatever service you decide to use. 
# We will use Amazon's Simple Storage Service [AWS-S3]

config.active_storage.service = :amazon

To enable our cloud to store files uploaded from our app we have to set up a few things in the Amazon Console to get it up and running.

Since I've already lost my focus here I am writing it tomorrow.

If I remember...

Please remind me at:

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Thank you!

Love,

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Easy File Uploading in Rails

active yet lazy...