Merge pull request #1976 from ruby-grape/bugfix/autoload

Be sure classes/modules listed for autoload really exist

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 #### Fixes
 
+* [#1976](https://github.com/ruby-grape/grape/pull/1976): Ensure classes/modules listed for autoload really exist - [@dnesteryuk](https://github.com/dnesteryuk).
 * [#1971](https://github.com/ruby-grape/grape/pull/1971): Fix BigDecimal coercion - [@FlickStuart](https://github.com/FlickStuart).
 * [#1968](https://github.com/ruby-grape/grape/pull/1968): Fix args forwarding in Grape::Middleware::Stack#merge_with for ruby 2.7.0 - [@dm1try](https://github.com/dm1try).
 

lib/grape.rb

@@ -84,7 +84,6 @@ module Extensions
     eager_autoload do
       autoload :DeepMergeableHash
       autoload :DeepSymbolizeHash
-      autoload :DeepHashWithIndifferentAccess
       autoload :Hash
     end
     module ActiveSupport

spec/spec_helper.rb

@@ -14,6 +14,8 @@
   require file
 end
 
+eager_load!
+
 # The default value for this setting is true in a standard Rails app,
 # so it should be set to true here as well to reflect that.
 I18n.enforce_available_locales = true

spec/support/eager_load.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+# Grape uses autoload https://api.rubyonrails.org/classes/ActiveSupport/Autoload.html.
+# When a class/module get added to the list, ActiveSupport doesn't check whether it really exists.
+# This method loads all classes/modules defined via autoload to be sure only existing
+# classes/modules were listed.
+def eager_load!(scope = Grape)
+  # get modules
+  scope.constants.each do |const_name|
+    const = scope.const_get(const_name)
+
+    next unless const.respond_to?(:eager_load!)
+
+    const.eager_load!
+
+    # check its modules, they might need to be loaded as well.
+    eager_load!(const)
+  end
+end