fix: symbol lookup without Rails

Author: palkan

lib/action_policy/ext/symbol_classify.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module ActionPolicy
+  module Ext
+    # Add `classify` to Symbol
+    module SymbolClassify
+      refine Symbol do
+        if "".respond_to?(:classify)
+          def classify
+            to_s.classify
+          end
+        else
+          def classify
+            word = to_s.capitalize
+            word.gsub!(/(?:_)([a-z\d]*)/) { $1.capitalize }
+            word
+          end
+        end
+      end
+    end
+  end
+end

lib/action_policy/lookup_chain.rb

@@ -12,6 +12,9 @@ module LookupChain
       using ActionPolicy::Ext::StringConstantize
     end
 
+    require "action_policy/ext/symbol_classify"
+    using ActionPolicy::Ext::SymbolClassify
+
     require "action_policy/ext/module_namespace"
     using ActionPolicy::Ext::ModuleNamespace
 
@@ -111,7 +114,7 @@ def policy_class_name_for(record)
     SYMBOL_LOOKUP = ->(record, namespace: nil, **) {
       next unless record.is_a?(Symbol)
 
-      policy_name = "#{record.to_s.classify}Policy"
+      policy_name = "#{record.classify}Policy"
       if namespace.nil?
         policy_name.safe_constantize
       else

test/action_policy/ext/symbol_classify_test.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+require "action_policy/ext/symbol_classify"
+using ActionPolicy::Ext::SymbolClassify
+
+class TestSymbolClassify < Minitest::Test
+  def test_simple_name
+    assert_equal "Test", :test.classify
+  end
+
+  def test_underscored_name
+    assert_equal "TeStO", :te_st_o.classify
+  end
+end