Remove alias_method_chain gem and include the patch from Vincent :tada

Appraisals

@@ -6,22 +6,19 @@ end
 
 appraise "rails-5" do
   gem 'activemodel', '~> 5.2'
-  gem 'alias_method_chain'
   gem 'bigdecimal'
   gem 'sqlite3', '~> 1.4.0'
   gem 'i18n', '~> 1.5.1'
 end
 
 appraise "rails-6" do
   gem 'activemodel', '~> 6.1'
-  gem 'alias_method_chain'
   gem 'bigdecimal'
   gem 'sqlite3', '~> 2.0'
 end
 
 appraise "rails-7" do
   gem 'activemodel', '~> 7.1'
-  gem 'alias_method_chain'
   gem 'bigdecimal'
   gem 'sqlite3', '~> 2.0'
 end

gemfiles/rails_5.gemfile

@@ -3,7 +3,6 @@
 source "https://rubygems.org"
 
 gem "activemodel", "~> 5.2"
-gem "alias_method_chain"
 gem "bigdecimal"
 gem "sqlite3", "~> 1.4.0"
 gem "i18n", "~> 1.5.1"

gemfiles/rails_6.gemfile

@@ -3,7 +3,6 @@
 source "https://rubygems.org"
 
 gem "activemodel", "~> 6.1"
-gem "alias_method_chain"
 gem "bigdecimal"
 gem "sqlite3", "~> 2.0"
 

gemfiles/rails_7.gemfile

@@ -3,7 +3,6 @@
 source "https://rubygems.org"
 
 gem "activemodel", "~> 7.1"
-gem "alias_method_chain"
 gem "bigdecimal"
 gem "sqlite3", "~> 2.0"
 

lib/zuora/attributes.rb

@@ -1,11 +1,6 @@
 module Zuora
   module Attributes
 
-    # If Rails 5.2 is used, alias_method_chain is required
-    if Gem.loaded_specs['activemodel'].version >= Gem::Version.new('5.2')
-      require 'alias_method_chain'
-    end
-
     def self.included(base)
       base.send(:include, ActiveModel::Naming)
       base.send(:include, ActiveModel::Conversion)
@@ -45,24 +40,17 @@ def define_attributes(&block)
         # generate association overrides for complex object handling
         # and cache the objects so that they may be modified and updated
         class_variable_get(:@@complex_attributes).each do |var, scope|
-          class_eval <<-EVAL
-            def #{scope}_with_complex
-              if new_record? || @#{scope}_cached
-                @#{scope} ||= []
-              else
-                @#{scope}_cached = true
-                @#{scope} = #{scope}_without_complex
+          class_eval <<~EVAL
+            prepend(Module.new do
+              def #{scope}
+                if new_record? || @#{scope}_cached
+                  @#{scope} ||= []
+                else
+                  @#{scope}_cached = true
+                  @#{scope} = super
+                end
               end
-            end
-            alias_method_chain :#{scope}, :complex
-
-            # if method_defined?(:#{scope})
-            #   prepend Module.new {
-            #     super
-            #     # alias_method :#{scope}_without_complex, :#{scope}
-            #     # alias_method :#{scope}, :#{scope}_with_complex
-            #   }
-            # end
+            end)
           EVAL
         end
       end
@@ -231,4 +219,4 @@ def remote_name
       self.class.name.base_name
     end
   end
-end
+end