Default timestamps to non-null

activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb

@@ -252,7 +252,7 @@ def #{column_type}(*args)                                               # def st
       # Appends <tt>:datetime</tt> columns <tt>:created_at</tt> and
       # <tt>:updated_at</tt> to the table.
       def timestamps(*args)
-        options = args.extract_options!
+        options = { :null => false }.merge(args.extract_options!)
         column(:created_at, :datetime, options)
         column(:updated_at, :datetime, options)
       end

activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb

@@ -507,8 +507,8 @@ def distinct(columns, order_by)
       # ===== Examples
       #  add_timestamps(:suppliers)
       def add_timestamps(table_name)
-        add_column table_name, :created_at, :datetime
-        add_column table_name, :updated_at, :datetime
+        add_column table_name, :created_at, :datetime, :null => false
+        add_column table_name, :updated_at, :datetime, :null => false
       end
 
       # Removes the timestamp columns (created_at and updated_at) from the table definition.

activerecord/test/cases/migration_test.rb

@@ -389,8 +389,8 @@ def test_create_table_with_timestamps_should_create_datetime_columns
       created_at_column = created_columns.detect {|c| c.name == 'created_at' }
       updated_at_column = created_columns.detect {|c| c.name == 'updated_at' }
 
-      assert created_at_column.null
-      assert updated_at_column.null
+      assert !created_at_column.null
+      assert !updated_at_column.null
     ensure
       Person.connection.drop_table table_name rescue nil
     end
@@ -471,11 +471,11 @@ def test_native_decimal_insert_manual_vs_automatic
 
       # Do a manual insertion
       if current_adapter?(:OracleAdapter)
-        Person.connection.execute "insert into people (id, wealth) values (people_seq.nextval, 12345678901234567890.0123456789)"
+        Person.connection.execute "insert into people (id, wealth, created_at, updated_at) values (people_seq.nextval, 12345678901234567890.0123456789, 0, 0)"
       elsif current_adapter?(:OpenBaseAdapter) || (current_adapter?(:MysqlAdapter) && Mysql.client_version < 50003) #before mysql 5.0.3 decimals stored as strings
-        Person.connection.execute "insert into people (wealth) values ('12345678901234567890.0123456789')"
+        Person.connection.execute "insert into people (wealth, created_at, updated_at) values ('12345678901234567890.0123456789', 0, 0)"
       else
-        Person.connection.execute "insert into people (wealth) values (12345678901234567890.0123456789)"
+        Person.connection.execute "insert into people (wealth, created_at, updated_at) values (12345678901234567890.0123456789, 0, 0)"
       end
 
       # SELECT