実際のスクリプトから少し削ってる。そのままだと動かないかも :gomenne:

associations_dumper.rb

# # ./bin/rails r script/associations_dumper.rb

dumper = MethodDumper.new do
  # ブロックの中で全てのテストを実行する。
  require "rspec"
  require "rspec/core/formatters/documentation_formatter"

  config = RSpec.configuration
  formatter = RSpec::Core::Formatters::DocumentationFormatter.new(config.output_stream)

  reporter =  RSpec::Core::Reporter.new(config)
  config.instance_variable_set(:@reporter, reporter)

  loader = config.send(:formatter_loader)
  notifications = loader.send(:notifications_for, RSpec::Core::Formatters::DocumentationFormatter)

  reporter.register_listener(formatter, *notifications)

  # 下記のようにオプションでパスを渡せば動作検証できる
  # bundle exec rails runner __FILE__ -- spec/models/tenant_spec.rb
  files = ARGV.presence || Dir[Rails.root.join("spec/**/*_spec.rb")].map { Pathname.new(_1).relative_path_from(Rails.root).to_s }

  $LOAD_PATH.unshift(Rails.root.join("spec").to_s)
  require "rails_helper"

  RSpec::Core::Runner.run(files)
end

Rails.application.eager_load!

# 関連名を使っているメソッド群を解析対象とする
klasses = ApplicationRecord.descendants.reject(&:abstract_class?)
klasses.each do |klass|
  klass.reflections.each do |reflection_name, reflection|
    if reflection.belongs_to? || reflection.has_one?
      dumper.add_method_trace("#{klass.generated_association_methods}#reload_#{reflection_name}")
      dumper.add_method_trace("#{klass.generated_association_methods}#build_#{reflection_name}")
      dumper.add_method_trace("#{klass.generated_association_methods}#create_#{reflection_name}")
      dumper.add_method_trace("#{klass.generated_association_methods}#create_#{reflection_name}!")
    end

    dumper.add_method_trace("#{klass.generated_association_methods}##{reflection_name}")
    dumper.add_method_trace("#{klass.generated_association_methods}##{reflection_name}=")
  end
end

require "csv"

FileUtils.mkdir_p("tmp/dumps")

# rubocop:disable Rails/FilePath
backtrace_cleaner = ActiveSupport::BacktraceCleaner.new.tap do |cleaner|
  cleaner.add_silencer { !(_1.start_with?("#{Rails.root}/app") || _1.start_with?("#{Rails.root}/spec")) }
end
# rubocop:enable Rails/FilePath

CSV.open("tmp/dumps/associations.csv", "w") do |csv|
  headers = %i(klass method_name node_id)

  csv << headers

  dumper.run do |row|
    trace_point = row[:trace_point]

    backtrace = backtrace_cleaner.clean(trace_point.send(:caller))
    called_from = backtrace[0].to_s
    caller_location = trace_point.send(:caller_locations).find { _1.to_s == called_from }
    node_id = RubyVM::AbstractSyntaxTree.node_id_for_backtrace_location(caller_location)

    # 呼ばれた関連名メソッド
    row = {
      klass: row[:klass].to_s,
      method_name: row[:method_name], # 呼び出したメソッド名
      node_id:,
    }

    pp(row)
    csv << headers.map { row.fetch(_1) }
  end
end