roberto-mello/lavra/andrew-kane-gem-writer

# 1. Dependencies (stdlib preferred)
require "forwardable"
 
# 2. Internal modules
require_relative "gemname/model"
require_relative "gemname/version"
 
# 3. Conditional Rails (CRITICAL - never require Rails directly)
require_relative "gemname/railtie" if defined?(Rails)
 
# 4. Module with config and errors
module GemName
  class Error < StandardError; end
  class InvalidConfigError < Error; end
 
  class << self
    attr_accessor :timeout, :logger
    attr_writer :client
  end
 
  self.timeout = 10  # Defaults set immediately
end

# Usage
class Product < ApplicationRecord
  searchkick word_start: [:name]
end
 
# Implementation
module GemName
  module Model
    def gemname(**options)
      unknown = options.keys - KNOWN_KEYWORDS
      raise ArgumentError, "unknown keywords: #{unknown.join(", ")}" if unknown.any?
 
      mod = Module.new
      mod.module_eval do
        define_method :some_method do
          # implementation
        end unless method_defined?(:some_method)
      end
      include mod
 
      class_eval do
        cattr_reader :gemname_options, instance_reader: false
        class_variable_set :@@gemname_options, options.dup
      end
    end
  end
end

# WRONG
require "active_record"
ActiveRecord::Base.include(MyGem::Model)
 
# CORRECT
ActiveSupport.on_load(:active_record) do
  extend GemName::Model
end
 
# Use prepend for behavior modification
ActiveSupport.on_load(:active_record) do
  ActiveRecord::Migration.prepend(GemName::Migration)
end

module GemName
  class << self
    attr_accessor :timeout, :logger
    attr_writer :master_key
  end
 
  def self.master_key
    @master_key ||= ENV["GEMNAME_MASTER_KEY"]
  end
 
  self.timeout = 10
  self.logger = nil
end

module GemName
  class Error < StandardError; end
  class ConfigError < Error; end
  class ValidationError < Error; end
end
 
# Validate early with ArgumentError
def initialize(key:)
  raise ArgumentError, "Key must be 32 bytes" unless key&.bytesize == 32
end

# test/test_helper.rb
require "bundler/setup"
Bundler.require(:default)
require "minitest/autorun"
require "minitest/pride"
 
# test/model_test.rb
class ModelTest < Minitest::Test
  def test_basic_functionality
    assert_equal expected, actual
  end
end

Gem::Specification.new do |spec|
  spec.name = "gemname"
  spec.version = GemName::VERSION
  spec.required_ruby_version = ">= 3.1"
  spec.files = Dir["*.{md,txt}", "{lib}/**/*"]
  spec.require_path = "lib"
  # NO add_dependency lines - dev deps go in Gemfile
end