Register framework integrations when the gem is required

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- Register the Active Record and Action View integrations when the gem is required, instead of from the railtie initializer
 - Add a top-level `null` option to the `add_monetize`/`monetize` migration helpers (#775)
 
 ## 3.0.0

lib/money-rails.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "active_support/lazy_load_hooks"
 require "money"
 require "monetize"
 require "monetize/core_extensions"
@@ -15,6 +16,19 @@ module MoneyRails
   extend Configuration
 end
 
+# Registering the hooks here, rather than in the railtie initializer, keeps the
+# integration points visible without a full Rails boot. Registration is lazy: the
+# blocks only run once the framework in question is loaded.
+ActiveSupport.on_load(:active_record) do
+  require "money-rails/active_model/validator"
+  require "money-rails/active_record/monetizable"
+  ActiveRecord::Base.include(MoneyRails::ActiveRecord::Monetizable)
+end
+
+ActiveSupport.on_load(:action_view) do
+  ActionView::Base.include MoneyRails::ActionViewExtension
+end
+
 if defined? Rails::Railtie
   require "money-rails/railtie"
   require "money-rails/engine"

lib/money-rails/hooks.rb

@@ -5,12 +5,11 @@ class Hooks
     PG_ADAPTERS = %w[activerecord-jdbcpostgresql-adapter postgresql postgis].freeze
 
     def self.init
-      # For Active Record
+      # For Active Record migrations
+      #
+      # These stay here, and not in money-rails.rb, because picking the migration
+      # extensions requires a configured database connection.
       ActiveSupport.on_load(:active_record) do
-        require "money-rails/active_model/validator"
-        require "money-rails/active_record/monetizable"
-        ::ActiveRecord::Base.include(MoneyRails::ActiveRecord::Monetizable)
-
         current_adapter = ::ActiveRecord::Base.connection_db_config.configuration_hash[:adapter]
         postgresql_with_money = PG_ADAPTERS.include?(current_adapter)
 
@@ -38,11 +37,6 @@ def self.init
         require "money-rails/mongoid/money"
       end
 
-      # For ActionView
-      ActiveSupport.on_load(:action_view) do
-        ::ActionView::Base.include MoneyRails::ActionViewExtension
-      end
-
       # For ActiveSupport
       ActiveSupport.on_load(:active_job) do
         if defined?(::ActiveJob::Serializers)

spec/money_rails/load_hooks_spec.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+if defined? ActiveRecord
+  describe MoneyRails do
+    describe "load hooks" do
+      it "monetizes Active Record without a Rails initializer" do
+        script = <<~RUBY
+          require "money-rails"
+          raise "requiring money-rails eagerly loaded Active Record" if defined?(::ActiveRecord)
+
+          require "active_record"
+          raise "monetize is missing" unless ActiveRecord::Base.respond_to?(:monetize)
+        RUBY
+
+        lib_path = File.expand_path("../../lib", __dir__)
+
+        expect(system(RbConfig.ruby, "-I", lib_path, "-e", script)).to be(true)
+      end
+    end
+  end
+end