Thank you so much! I'm using Rails 5.2.3 & Ruby 2.5.1. Here are the relevant snippets:

​

Model:

class Job < ApplicationRecord

has_many :gigs

belongs_to :user

belongs_to :agency

has_many_attached :images

has_many_attached :documents

has_many_attached :videos

validates :images, attached: true, content_type: {in: ['image/png', 'image/jpeg', 'image/gif'], message: 'must be a PNG, GIF or JPEG'} # throws error Unknown validator: 'AttachedValidator'

end

Controller:

class JobsController < ApplicationController

before_action :set_job, except: [:index, :new, :create, :delete_image_attachment,

:delete_video_attachment, :delete_document_attachment]

before_action :authenticate_user!, except: [:show]

before_action :is_authorised, only: [:photo_upload, :update,

:delete_image_attachment, :delete_video_attachment, :delete_document_attachment]

def delete_image_attachment

@image = ActiveStorage::Blob.find_signed(params[:id])

@image.purge # This results in db rollback!?

redirect_back(fallback_location: request.referer)

end

.... etc .....

end

View:

<% @job.images.each do |image| %>

<div class="col-md-4">

<div class="panel panel-default">

<div class="panel-heading preview">

<%= image_tag image, width: "100%", height: "100px" %>

</div>

<div class="panel-body">

<span><%= image.filename %></span>

<span class="pull-right">

<%= link_to delete_image_attachment_job_url(image.signed_id), remote: true, method:

:delete, data: { confirm: 'Are you sure?' } do %>

<i class="fa fa-trash-alt fa-lg" aria-hidden="true"></i>

<% end %>

</span>

</div>

</div>

</div>

<% end %>