Example for bugsnag PR

repro.rb

# frozen_string_literal: true

require "bundler/inline"
require "active_support/concern"
require_relative "./repro_helper"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  # Activate the gem you are reporting the issue against.
  gem "activerecord", "~> 7.0.0"
  gem "sqlite3"
end

require "active_record"
require "minitest/autorun"
require "logger"

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts, force: true do |t|
  end

  create_table :comments, force: true do |t|
    t.integer :post_id
    t.text :body
  end
  # Adding this contrived index to cause the creation of a second comment to
  # fail at the DB layer
  add_index(:comments, :post_id, unique: true)
end

class Post < ActiveRecord::Base
  has_many :comments
end

class Comment < ActiveRecord::Base
  include Foo

  belongs_to :post
end

class BugTest < Minitest::Test
  def test_association_stuff
    Comment.delete_all
    post = Post.create!

    begin
      post.comments.create!
      # This will fail due to a uniqueness constraint, and because the Comment
      # model includes the Foo module, the first "in-project" stacktrace will be
      # from block.call in the file defining Foo
      post.comments.create!
    rescue StandardError => e
      puts e.class
      puts e.backtrace
    end

    comments_count = post.comments
    assert_equal 1, comments_count
    assert_equal 1, Comment.count
    assert_equal post.id, Comment.first.post.id
  end
end

repro_helper.rb

module Foo
  extend ActiveSupport::Concern

  included do
    around_create :around_cb

    def around_cb(&block)
      block.call
    end
  end
end