Stop evalling the environment file in favor of require + setting a...

Stop evalling the environment file in favor of require + setting a Kernel#config. This will fix the bug where reopening classes caused them to be overwritten.

railties/lib/rails/application.rb

@@ -82,6 +82,23 @@ def call(env)
       @app.call(env)
     end
 
+
+    # Loads the environment specified by Configuration#environment_path, which
+    # is typically one of development, test, or production.
+    initializer :load_environment do
+      next unless File.file?(config.environment_path)
+
+      config = self.config
+
+      Kernel.class_eval do
+        meth = instance_method(:config) if Object.respond_to?(:config)
+        define_method(:config) { config }
+        require config.environment_path
+        remove_method :config
+        define_method(:config, &meth) if meth
+      end
+    end
+
     # Set the <tt>$LOAD_PATH</tt> based on the value of
     # Configuration#load_paths. Duplicates are removed.
     initializer :set_load_path do
@@ -123,24 +140,6 @@ def call(env)
       end
     end
 
-    # Loads the environment specified by Configuration#environment_path, which
-    # is typically one of development, test, or production.
-    initializer :load_environment do
-      silence_warnings do
-        next if @environment_loaded
-        next unless File.file?(config.environment_path)
-
-        @environment_loaded = true
-        constants = self.class.constants
-
-        eval(IO.read(config.environment_path), binding, config.environment_path)
-
-        (self.class.constants - constants).each do |const|
-          Object.const_set(const, self.class.const_get(const))
-        end
-      end
-    end
-
     # Preload all frameworks specified by the Configuration#frameworks.
     # Used by Passenger to ensure everything's loaded before forking and
     # to avoid autoload race conditions in JRuby.