[RUBY] Flow to implement image posting function using ActiveStorage

Introduction

There is a function that often uploads images on SNS, but I will introduce the Gem used when implementing it in Rails. Since it will be long, I will focus on the preparation stage of implementation this time. Scheduled twice in total.

What is Active Storage?

It's now included in Rails without having to install it as a Gem. You will be able to use methods that make it easy to upload files such as images, and you can easily create a table to save images.

Flow until implementation of image upload function

1. Install ImageMagick
2. Install two gems
3. Reboot the local server
4. Install Active Strage
5. Table generation

1. Install ImageMagick

In the first place, ImageMagick is an image processing tool, not a Gem, but a category of software. When installing from Homebrew

brew install imagemagick

ImageMagick alone cannot handle it in Ruby, so you need to install the following two gems.

2. Install two gems

(1)MiniMagick ImageMagick features will be available in Ruby. (2)ImageProcessing Adjust the size of the image, which cannot be done with MiniMagick alone.

Gemfile

gem 'mini_magick'
gem 'image_processing', '~>1.2' #Specifying the version

OK at the bottom of the Gemfile. 　 After writing, don't forget to use the terminal

bundle install

3. Reboot the local server

rails s

Don't forget when you newly install Gem.

4. Install Active Storage

It was sunny and Active Storage became available, so Install using the terminal

rails active_storage:install

When installed, a migration file will be generated automatically.

5. Table generation

If there is no particular column change, leave it as it is

rails db:migrate

Confirm that two tables are generated by this migration.

point

-[x] Implement the image upload function using ActiveStorage. -[x] Install two gems so that they can be used in Ruby.

Finally

Next time, I will summarize how to save images and how to display saved images.