1 files changed, 26 insertions, 9 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/read.rb b/activerecord/lib/active_record/attribute_methods/read.rb
index 69d5cd83f1..a248eb3a7b 100644
--- a/activerecord/lib/active_record/attribute_methods/read.rb
+++ b/activerecord/lib/active_record/attribute_methods/read.rb
@@ -43,7 +43,7 @@ module ActiveRecord
             end
 
             if attr_name == primary_key && attr_name != "id"
-              define_read_method(:id, attr_name, columns_hash[attr_name])
+              define_read_method('id', attr_name, columns_hash[attr_name])
             end
           end
 
@@ -59,7 +59,9 @@ module ActiveRecord
           end
 
           # Define an attribute reader method.  Cope with nil column.
-          def define_read_method(symbol, attr_name, column)
+          # method_name is the same as attr_name except when a non-standard primary key is used,
+          # we still define #id as an accessor for the key
+          def define_read_method(method_name, attr_name, column)
             cast_code = column.type_cast_code('v')
             access_code = "(v=@attributes['#{attr_name}']) && #{cast_code}"
 
@@ -70,12 +72,25 @@ module ActiveRecord
             if cache_attribute?(attr_name)
               access_code = "@attributes_cache['#{attr_name}'] ||= (#{access_code})"
             end
-            if symbol =~ /^[a-zA-Z_]\w*[!?=]?$/
-              generated_attribute_methods.module_eval("def _#{symbol}; #{access_code}; end; alias #{symbol} _#{symbol}", __FILE__, __LINE__)
+
+            # Where possible, generate the method by evalling a string, as this will result in
+            # faster accesses because it avoids the block eval and then string eval incurred
+            # by the second branch.
+            #
+            # The second, slower, branch is necessary to support instances where the database
+            # returns columns with extra stuff in (like 'my_column(omg)').
+            if method_name =~ /^[a-zA-Z_]\w*[!?=]?$/
+              generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__
+                def _#{method_name}
+                  #{access_code}
+                end
+
+                alias #{method_name} _#{method_name}
+              STR
             else
               generated_attribute_methods.module_eval do
-                define_method("_#{symbol}") { eval(access_code) }
-                alias_method(symbol, "_#{symbol}")
+                define_method("_#{method_name}") { eval(access_code) }
+                alias_method(method_name, "_#{method_name}")
               end
             end
           end
@@ -84,9 +99,11 @@ module ActiveRecord
       # Returns the value of the attribute identified by <tt>attr_name</tt> after it has been typecast (for example,
       # "2004-12-12" in a data column is cast to a date object, like Date.new(2004, 12, 12)).
       def read_attribute(attr_name)
-        send "_#{attr_name}"
-      rescue NoMethodError
-        _read_attribute attr_name
+        if respond_to? "_#{attr_name}"
+          send "_#{attr_name}" if @attributes.has_key?(attr_name.to_s)
+        else
+          _read_attribute attr_name
+        end
       end
 
       def _read_attribute(attr_name)