Rails文件上传 #

rails active_storage:install
rails db:migrate

class User < ApplicationRecord
  has_one_attached :avatar
end

class Article < ApplicationRecord
  has_many_attached :images
end

<%= form.file_field :avatar %>
<%= form.file_field :images, multiple: true %>

def update
  @user = User.find(params[:id])
  @user.avatar.attach(params[:user][:avatar])
end

<%= image_tag @user.avatar %>
<%= link_to '下载', @user.avatar, download: true %>