Describe the bug

The error:
DEBUG -- [Bugsnag]: Breadcrumb Mongo query succeeded meta_data collection:Array has been dropped for having an invalid data type

Bugsnag is failing to create the breadcrumbs when rescuing Mongoid::Errors::Validations. We recently upgraded to Rails v5.2.4.4 and immediately started seeing these errors in our logs when a failed attempt to persist a record is rescued: gems/mongoid-6.1.1/lib/mongoid/persistable.rb:76:in 'fail_due_to_validation!'

This is the code for the rescue:

        begin
          identifier_mapping.save! if identifier_mapping.changed?
        rescue Mongoid::Errors::Validations => e
          Bugsnag.notify(e)
          Rails.logger.warn(e.message)
        end

According to https://docs.bugsnag.com/platforms/ruby/rails/automatically-captured-data/ for Mongo breadcrumbs, you automatically capture the collection type meta_data for this breadcrumb type.

However, since the upgrade the Rails, these errors are being logged. We didn't change our Bugsnag version, and the Breadcrumbs validations doesn't seem to support the type Array, which leaves me wondering if the returned error from Mongoid has changed, and this needs to be added to the validations, as per this issue:#539

Environment

• Bugsnag version: 6.15.0
• Ruby version:
• Bundle version: 2.1.4
• Integration framework version:
  • Rails: 5.2.4.4
  • Mongoid: 6.1.1
  • Mongo: 2.10.2