Can't save model with associated ActionText with image

[tosbourn]

Having followed the guidance to enable ActIonText within Rails Admin I'm still getting an error when saving content that has an image.

Error message: undefined method 'to_model' for #<ActiveStorage::VariantWithRecord:0x00007f9499bf30d0>

This is being thrown in my _blob partial;

  <% if blob.representable? %>
    <picture>
      <source srcset="<%= polymorphic_url(blob.representation(resize_to_limit: local_assigns[:in_gallery] ? [ 800, 600 ] : [ 1024, 768 ], format: :webp), script_name: nil) %>" type="image/webp" />
      <%= image_tag polymorphic_url(blob.representation(resize_to_limit: local_assigns[:in_gallery] ? [ 800, 600 ] : [ 1024, 768 ]), script_name: nil), alt: (blob.caption ? blob.caption : blob.filename), class: "mx-auto rounded-lg", loading: 'lazy' %>
    </picture>
  <% end %>

You'll note I've already applied the polymorphic_url patch as suggested, in the wiki article.

What I also found odd is if you remove the ActionText content (so the form doesn't have anything to do with ActionText) the error still happens, even though in the payload I can see my content would not have been submitted by the form.

Notes

related model:

class Article < ApplicationRecord
  include ArticleAdmin
  has_rich_text :content
  ...
end

related rails_admin config:

module ArticleAdmin
  extend ActiveSupport::Concern

  included do
    rails_admin do
      list do
        ...
      end

      edit do
        field :approved
        field :title
        field :content
        field :categories
      end
    end
  end
end

[DilankaHerath]

Did you figure it out? I have the same problem

[juan-apa]

I still have this issue, I'm using rails 7. Did you any of you find a solution to this?

[lrjbrual]

any update on this? thanks

[juan-apa]

for anyone using webpacker (either rails 7 + webpacker, or rails 5, 6 +webpacker), you should follow the guide on setting up actiontext with webpacker here.
I'm still stuck trying to figure out how to set it up with rails 7 + importmap though.

[rbngzlv]

Hi! I'm not using rails_admin but I hitted the same error with another gem to build admin interfaces. After digging into it, the reason seems to be that we are rendering the partial from an isolated engine (rails/rails#31325) and it doesn't know how to resolve the polymorphic url.

The easiest solution that worked for me is to edit the partial app/views/active_storage/blobs/_blob.html.erb to use main_app.url_for to pass directly pass the url to the image_tag helper:

- <%= image_tag blob.representation(resize_to_limit: local_assigns[:in_gallery] ? [ 800, 600 ] : [ 1024, 768 ]) %>
+ <%= image_tag main_app.url_for(blob.representation(resize_to_limit: local_assigns[:in_gallery] ? [ 800, 600 ] : [ 1024, 768 ])) %>

It should also work using main_app.polymorphic_url instead of only polymorphic_url, so if someone using this project can validate the solution, perhaps the wiki article (mentioned in the opener post) can be updated.

[Tronerta]

for anyone using webpacker (either rails 7 + webpacker, or rails 5, 6 +webpacker), you should follow the guide on setting up actiontext with webpacker here. I'm still stuck trying to figure out how to set it up with rails 7 + importmap though.

Hi, any progress with rails 7 + importmap?

[mikefischer]

I was able to get image upload / render working within ActionText by including ActiveStorage::SetCurrent in a custom parent class.

Per the docs,

Sets the ActiveStorage::Current.url_options attribute, which the disk service uses to generate URLs. Include this concern in custom controllers that call ActiveStorage::Blob#url, ActiveStorage::Variant#url, or ActiveStorage::Preview#url so the disk service can generate URLs using the same host, protocol, and port as the current request.

Example setup:

# config/initializers/rails_admin.rb

RailsAdmin.config do |config|
  config.parent_controller = "Admin::BaseController"
  # ...
end

# app/controllers/admin/base_controller.rb

module Admin
  class BaseController < ActionController::Base
    include ActiveStorage::SetCurrent
  end
end

Additionally, I modified app/views/active_storage/blobs/_blob.html.erb per @rbngzlv's suggestion, but with one tweak: I had to call .processed.url on the ActiveStorage::Variant object:

# app/views/active_storage/blobs/_blob.html.erb

<%= image_tag blob.representation(resize_to_limit: local_assigns[:in_gallery] ? [ 800, 600 ] : [ 1024, 768 ]).processed.url %>

Rails 7.0.3 / Ruby 2.7.6