Rails 5回形针从URL保存图像

Question

I'm a total Rails newbie so apologies if this is a simple question, but I've been unable to find a clear answer. I'm trying to allow a user to attach an image to a post either by uploading a file or entering the URL of an image using the Paperclip gem.

File upload works fine, but using the URL method I receive a 'No handler defined' error

link.rb

require "open-uri"

class Link < ApplicationRecord
    attr_reader :image_from_url
    has_attached_file :image, styles: { medium: "600x600>", thumb: "100x100#" }, default_url: "/images/:style/missing.png"
    validates_attachment_content_type :image, content_type: /\Aimage\/.*\z/

    def image_from_url=(url)
        self.image = URI.parse(url)
        @image_from_url = url
    end
end

_form.html.erb

<%= form_with(model: link, local: true) do |form| %>
    <%= form.file_field :image, id: :link_image %>
    <%= form.text_field :image, id: :link_image_url %>
<% end %>

links_controller.erb

def create
    @link = current_user.links.build(link_params)
end

def link_params
  params.require(:link).permit(:title, :url, :description, :image, :slug)
end

I must confess that I don't fully understand what is happening at each stage of the process which is why I'm struggling to debug it.

Answer 1

I am recommending carrierwave gem over paperclip. Easier to parse from link.

Carrierwave