Merge pull request #5304 from kennyj/fix_connection_dependency

Revert table_name= needs connection now, so just stub table_name

activerecord/lib/active_record/model_schema.rb

@@ -118,7 +118,7 @@ def table_name=(value)
 
         if defined?(@table_name)
           return if value == @table_name
-          reset_column_information
+          reset_column_information if connected?
         end
 
         @table_name        = value

railties/test/generators/session_migration_generator_test.rb

@@ -15,7 +15,7 @@ def test_session_migration_with_given_name
   end
 
   def test_session_migration_with_custom_table_name
-    ActiveRecord::SessionStore::Session.stubs(:table_name => "custom_table_name")
+    ActiveRecord::SessionStore::Session.table_name = "custom_table_name"
     run_generator
     assert_migration "db/migrate/add_sessions_table.rb" do |migration|
       assert_match(/class AddSessionsTable < ActiveRecord::Migration/, migration)