ActiveStorage update blob in attachment from direct upload

rubyonrails-talk
,
6

Best way is using a concentrating model, like you mentioned, and creating a custom controller.

Model:

class Attachment < ApplicationRecord
  belongs_to :record, polymorphic: true
  has_one_attached :file
end

Route:

get "files/:id/:filename", to: "attachments#show"

Controller

class AttachmentsController < ActiveStorage::Blobs::ProxyController
  private
    def set_blob
      @blob = Attachment.find(params[:id]).file.blob
    end
end

If you don’t want to do that, then your second option works (as long as you are using has_one_attached instead of has_many_attached):

Route:

get "files/:model/:id/:filename", to: "attachments#show"

Controller

class AttachmentsController < ActiveStorage::Blobs::ProxyController
  private
    def set_blob
      @blob = params[:model].classify.find(params[:id]).file.blob
    end
end

PS: If you are using has_many_attached, don’t. It’s almost never worth it.

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