attributes are cached by string keys, so to_s to support symbols. fixes #5549

activerecord/lib/active_record/attribute_methods/read.rb

@@ -118,7 +118,7 @@ module ActiveRecord
       # "2004-12-12" in a data column is cast to a date object, like Date.new(2004, 12, 12)).
       def read_attribute(attr_name)
         # If it's cached, just return it
-        @attributes_cache.fetch(attr_name) { |name|
+        @attributes_cache.fetch(attr_name.to_s) { |name|
           column = @columns_hash.fetch(name) {
             return self.class.type_cast_attribute(name, @attributes, @attributes_cache)
           }

activerecord/test/cases/base_test.rb

@@ -62,7 +62,11 @@ end
 
 class Weird < ActiveRecord::Base; end
 
-class Boolean < ActiveRecord::Base; end
+class Boolean < ActiveRecord::Base
+  def has_fun
+    super
+  end
+end
 
 class LintTest < ActiveRecord::TestCase
   include ActiveModel::Lint::Tests
@@ -957,6 +961,16 @@ class BasicsTest < ActiveRecord::TestCase
     assert b_true.value?
   end
 
+  def test_boolean_without_questionmark
+    b_true = Boolean.create({ "value" => true })
+    true_id = b_true.id
+
+    subclass   = Class.new(Boolean).find true_id
+    superclass = Boolean.find true_id
+
+    assert_equal superclass.read_attribute(:has_fun), subclass.read_attribute(:has_fun)
+  end
+
   def test_boolean_cast_from_string
     b_blank = Boolean.create({ "value" => "" })
     blank_id = b_blank.id

activerecord/test/schema/schema.rb

@@ -91,6 +91,7 @@ ActiveRecord::Schema.define do
 
   create_table :booleans, :force => true do |t|
     t.boolean :value
+    t.boolean :has_fun, :null => false, :default => false
   end
 
   create_table :bulbs, :force => true do |t|