[RUBY] Multiple image upload function using Rails Carrierwave

It is described as a memorandum.

Introducing a gem called Carrierwave


Describe the following in the Gemfile

gem "carrierwave", "~> 2.0"

When finished, at the terminal bi

bundle install

Creating an Uploader

bundle exec rails g uploader Images

The following is created.


I can play around with the settings of the uploaded file, but this time I will not.

MVC settings

Image registration is possible with a model called Memory for the Post model.




class Post < ApplicationRecord
  has_many :memories
  accepts_nested_attributes_for :memories, allow_destroy: true
  validates :title, presence: true

The accepts_nested_attributes_for: memories setting allows you to register memories on posts_controller.



class Memory < ApplicationRecord
  belongs_to :post
  mount_uploader :image, ImagesUploader

mount_uploader is the carrierwave setting. Now you can easily upload.




class PostsController < ApplicationController

  def new
    @post = Post.new
		# @post.memories.The build is ready to save the memories associated with the post
    @post_memory = @post.memories.build

  def create
    post = Post.new(post_params)
    if post.save!
		#The following is the process to save in memories. Multiple images can be saved with each statement.
      params[:memories][:image].each do |image|
        post.memories.create(image: image, post_id: post.id)
    redirect_to root_path


    def post_params
      params.require(:post).permit(:title, memories_attributes: [:image]).merge(user_id: current_user.id)



<%= form_for @post, local: true,  html: {class: "form_area"} do |f| %>
        <div class="form_area__field">
          <%= f.text_area :title, id: "post_text", placeholder: "Enter the posted content", rows: 10%>

          <div class="form_area__image_field">
            <%= f.fields_for :memories do |m| %>
              <%= m.label :image, "image" %>
              <%= m.file_field :image, multiple: true, name: "memories[image][]" %>
              <%= hidden_field :memories, :post_id, value: @post.id %>
            <% end %>

          <div class="form_area__hidden_field">
            <%= hidden_field :post, :user_id, value: current_user.id %>

          <div class="form_area__action">
            <%= f.submit "Post", class: "form_area__action__btn" %>

      <% end %>

You can save multiple classes in one post with fields_for.

multiple: true is set to allow multiple images to be posted.

How to display?

<% @post.memories.each do |m|%>
     <%= image_tag m.image.url %>
<% end %>

Can be displayed above.

How to add an image? (Added on January 16, 2021)

Implemented the function to add an image to an article that has already been posted with an image. The result is very simple, but I had a hard time not knowing how to implement it.


--If the content of the article is changed, only the article will be changed --Otherwise the image will be added


def update

    post = Post.find(params[:id])
    #Comparing the article before the update with the article passed as params
    if post.title != params[:post][:title]



      params[:memories][:image].each do |image|
        post.memories.create(image: image, post_id: post.id)

    redirect_to root_path

I think it would be better if I could edit the selected image, but this feature is coming again. .. ..

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