JSON editor is not present when creating nested resources

[Sébastien Dubois]

I have a Post which has_many Post::Translations, which themselves have a JSON tags property. When creating the post with its nested resource(s), the tag editor does not appear (http://localhost:3000/admin/posts/new):

However it does appear when creating the translation sub-resource directly (http://localhost:3000/admin/post/translations/new):

Also, the editor does appear when editing an existing post:

The dashboard is configured as follows:

# app/dashboards/post_dashboard.rb
class PostDashboard < Administrate::BaseDashboard
  ATTRIBUTE_TYPES = {
    translations: NestedHasMany.with_options(class_name: "Post::Translation"),
    ...
  }.freeze
  FORM_ATTRIBUTES = %i[
  translations
  ...
  ].freeze
end

# app/dashboards/post/translation_dashboard.rb
class Post::TranslationDashboard < Administrate::BaseDashboard
  ATTRIBUTE_TYPES = {
    ...
    tags: Field::JSONB,
    ...
  }.freeze
end

# app/fields/nested_has_many.rb
require "administrate/field/base"

class NestedHasMany < Administrate::Field::NestedHasMany
  def self.permitted_attribute(associated_resource, _options = nil)
    {
      "#{associated_resource}_attributes".to_sym =>
        associated_attributes(associated_resource, _options),
    }
  end

  def self.associated_attributes(associated_resource, _options)
    dashboard_class = dashboard_for_resource(associated_resource, _options)
    DEFAULT_ATTRIBUTES + dashboard_class.new.permitted_attributes
  end

  # Hack: reimplement Administrate::Field::NestedHasMany.dashboard_for_resource to preserve namespace
  def self.dashboard_for_resource(resource, _options)
    class_name = _options && _options[:class_name] || resource.to_s.classify
    "#{class_name}Dashboard".constantize
  end

  def association_name
    options.fetch(
      :association_name,
      associated_class_name.underscore.pluralize[/([^\/]*)$/, 1],
    )
  end
end

As my tags cannot be nil (as enforced by DB schema), this issue prevents creating new posts and is therefore quite blocking.

Using Rails 5.2.3, Administrate 0.12.0, administrate-field-jsonb 0.4.0, and administrate-field-nested_has_many 1.1.0 although it's mostly overridden; code is included for reference above but in principle unrelated to this issue.

[Serhii Volkov]

@sedubois as far as I understand you have a problem with displaying editors that were added after page initialized. We are using this JS https://github.com/codica2/administrate-field-jsonb/blob/master/app/assets/javascripts/administrate-field-jsonb/components/editor.js to initialize the editor. You need to run this code every time you add a new entity with NestedHasMany.

[Sébastien Dubois]

@volkov-sergey I see here that the JS is included with Administrate::Engine.add_javascript 'administrate-field-jsonb/application'. That code is inside an "engine" about which I don't know anything. Do you know how/where that "engine" should be loaded?