2 files changed, 6 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/primary_key.rb b/activerecord/lib/active_record/attribute_methods/primary_key.rb
index 310f1b6e75..3e454b713a 100644
--- a/activerecord/lib/active_record/attribute_methods/primary_key.rb
+++ b/activerecord/lib/active_record/attribute_methods/primary_key.rb
@@ -8,27 +8,32 @@ module ActiveRecord
       # Returns this record's primary key value wrapped in an Array if one is
       # available.
       def to_key
+        sync_with_transaction_state
         key = self.id
         [key] if key
       end
 
       # Returns the primary key value.
       def id
+        sync_with_transaction_state
         read_attribute(self.class.primary_key)
       end
 
       # Sets the primary key value.
       def id=(value)
+        sync_with_transaction_state
         write_attribute(self.class.primary_key, value) if self.class.primary_key
       end
 
       # Queries the primary key value.
       def id?
+        sync_with_transaction_state
         query_attribute(self.class.primary_key)
       end
 
       # Returns the primary key value before type cast.
       def id_before_type_cast
+        sync_with_transaction_state
         read_attribute_before_type_cast(self.class.primary_key)
       end
 
diff --git a/activerecord/lib/active_record/attribute_methods/read.rb b/activerecord/lib/active_record/attribute_methods/read.rb
index 3c03cce838..506f5d75f9 100644
--- a/activerecord/lib/active_record/attribute_methods/read.rb
+++ b/activerecord/lib/active_record/attribute_methods/read.rb
@@ -74,7 +74,7 @@ module ActiveRecord
       # to a date object, like Date.new(2004, 12, 12)).
       def read_attribute(attr_name)
         # If it's cached, just return it
-        # We use #[] first as a perf optimization for non-nil values. See https://gist.github.com/3552829.
+        # We use #[] first as a perf optimization for non-nil values. See https://gist.github.com/jonleighton/3552829.
         name = attr_name.to_s
         @attributes_cache[name] || @attributes_cache.fetch(name) {
           column = @columns_hash.fetch(name) {