Add local gem laoder helper

.gitignore

@@ -0,0 +1,2 @@
+.DS_Store
+.envrc

my_rails_app/Gemfile

@@ -2,7 +2,7 @@ source "https://rubygems.org"
 
 ruby "3.3.0"
 
-gem "my_namespace-my_gem", path: "../my_namespace-my_gem"
+gem "my_root_namespace-my_namespace-my_gem", path: "../my_root_namespace-my_namespace-my_gem"
 
 # Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
 gem "rails", "~> 7.1.3"

my_rails_app/Gemfile.lock

@@ -1,8 +1,9 @@
 PATH
-  remote: ../my_namespace-my_gem
+  remote: ../my_root_namespace-my_namespace-my_gem
   specs:
-    my_namespace-my_gem (0.1.0)
+    my_root_namespace-my_namespace-my_gem (0.1.0)
       http
+      zeitwerk
 
 GEM
   remote: https://rubygems.org/
@@ -269,7 +270,7 @@ DEPENDENCIES
   bootsnap
   debug
   importmap-rails
-  my_namespace-my_gem!
+  my_root_namespace-my_namespace-my_gem!
   propshaft
   puma (>= 5.0)
   rails (~> 7.1.3)

my_rails_app/app/controllers/dashboard_controller.rb

@@ -1,5 +1,5 @@
 class DashboardController < ApplicationController
   def show
-    render inline: MyNamespace::MyGem.do_something
+    render inline: MyRootNamespace::MyNamespace::MyGem.do_something
   end
 end

my_rails_app/app/utils/local_gem_reloading.rb

@@ -0,0 +1,28 @@
+class LocalGemReloading
+  def self.setup_reloading_for_local_zeitwerk_gem(gem_name, local_gems_folder)
+    gem_path = Pathname.new(File.join(local_gems_folder, gem_name, "lib"))
+
+    parts = gem_name.split("-")
+    gem_root = parts.delete(parts.last)
+    gem_namespaces = parts.map(&:camelize)
+
+    loader_tag = "#{[gem_namespaces.join("::"), gem_root.underscore].join('-')}"
+
+    gem_loader = Zeitwerk::Registry.loaders.find { |loader| loader.tag == loader_tag }
+
+    file_watcher = ActiveSupport::FileUpdateChecker.new(gem_path.glob('**/*')) do
+      gem_loader.reload
+    end
+
+    Rails.application.reloaders << Class.new do 
+      def initialize(file_watcher)
+        @file_watcher = file_watcher
+      end
+
+      def updated?
+        @file_watcher.execute_if_updated
+      end
+    end.new(file_watcher)
+    true
+  end
+end

my_rails_app/config/environments/development.rb

@@ -1,4 +1,5 @@
 require "active_support/core_ext/integer/time"
+require_relative "../../app/utils/local_gem_reloading"
 
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
@@ -71,4 +72,9 @@
 
   # Raise error when a before_action's only/except options reference missing actions
   config.action_controller.raise_on_missing_callback_actions = true
+
+  LocalGemReloading.setup_reloading_for_local_zeitwerk_gem(
+    "my_root_namespace-my_namespace-my_gem",
+    Rails.root.join("../")
+  )
 end

my_root_namespace-my_namespace-my_gem/Gemfile.lock

@@ -0,0 +1,59 @@
+PATH
+  remote: .
+  specs:
+    my_root_namespace-my_namespace-my_gem (0.1.0)
+      http
+      zeitwerk
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.8.6)
+      public_suffix (>= 2.0.2, < 6.0)
+    base64 (0.2.0)
+    diff-lcs (1.5.1)
+    domain_name (0.6.20240107)
+    ffi (1.16.3)
+    ffi-compiler (1.0.1)
+      ffi (>= 1.0.0)
+      rake
+    http (5.2.0)
+      addressable (~> 2.8)
+      base64 (~> 0.1)
+      http-cookie (~> 1.0)
+      http-form_data (~> 2.2)
+      llhttp-ffi (~> 0.5.0)
+    http-cookie (1.0.5)
+      domain_name (~> 0.5)
+    http-form_data (2.3.0)
+    llhttp-ffi (0.5.0)
+      ffi-compiler (~> 1.0)
+      rake (~> 13.0)
+    public_suffix (5.0.4)
+    rake (13.1.0)
+    rspec (3.13.0)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.0)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.0)
+    zeitwerk (2.6.13)
+
+PLATFORMS
+  ruby
+  x86_64-darwin-21
+
+DEPENDENCIES
+  my_root_namespace-my_namespace-my_gem!
+  rake (~> 13.0)
+  rspec (~> 3.0)
+
+BUNDLED WITH
+   2.5.3

my_root_namespace-my_namespace-my_gem/lib/my_root_namespace/my_namespace/my_gem.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+require "http"
+require "zeitwerk"
+loader = Zeitwerk::Loader.for_gem_extension(MyRootNamespace::MyNamespace)
+loader.enable_reloading if ENV["LOCAL_GEM_RELOADING"]
+loader.setup
+
+module MyRootNamespace
+  module MyNamespace
+    module MyGem
+      def self.do_something
+        Something.new.do
+      end
+    end
+  end
+end

my_root_namespace-my_namespace-my_gem/lib/my_root_namespace/my_namespace/my_gem/something.rb

@@ -0,0 +1,12 @@
+module MyRootNamespace
+  module MyNamespace
+    module MyGem
+      class Something
+        def do
+          return "A"
+          return "B"
+        end
+      end
+    end
+  end
+end

my_root_namespace-my_namespace-my_gem/lib/my_root_namespace/my_namespace/my_gem/version.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module MyRootNamespace
+  module MyNamespace
+    module MyGem
+      VERSION = "0.1.0"
+    end
+  end
+end

my_namespace-my_gem/my_namespace-my_gem.gemspec → my_root_namespace-my_namespace-my_gem/my_root_namespace-my_namespace-my_gem.gemspec

@@ -1,10 +1,10 @@
 # frozen_string_literal: true
 
-require_relative "lib/my_namespace/my_gem/version"
+require_relative "lib/my_root_namespace/my_namespace/my_gem/version"
 
 Gem::Specification.new do |spec|
-  spec.name = "my_namespace-my_gem"
-  spec.version = MyNamespace::MyGem::VERSION
+  spec.name = "my_root_namespace-my_namespace-my_gem"
+  spec.version = MyRootNamespace::MyNamespace::MyGem::VERSION
   spec.authors = ["David"]
   spec.email = ["asmoo252@gmail.com"]
 
@@ -33,6 +33,7 @@ Gem::Specification.new do |spec|
 
   # Uncomment to register a new dependency of your gem
   spec.add_dependency "http"
+  spec.add_dependency "zeitwerk"
 
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html