Displays/assigns null when showing/editing empty object

[Sébastien Dubois]

There are 3 related issues when a JSONB field contains a non-null but empty object ([] or {}).

1/ It is rendered as - on show view:

2/ It is rendered as null on edit view:

3/ When saving the form, even though I have not modified anything, instead of keeping the original value it tries to assign the value null, which breaks my non-null DB constraint and throws an error.

Instead, it should render the empty array or empty object, as below:

My code:

# db/schema.rb
  create_table "post_translations", force: :cascade do |t|
    ...
    t.jsonb "tags", default: [], null: false
end

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

(+ using workaround described in #1 (comment))

Using administrate-field-jsonb 0.4.1.