MySQL, PostgreSQL: change_column_default quotes the default value and doesn't lose column type information. References #3987, closes #6664.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5935 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* MySQL, PostgreSQL: change_column_default quotes the default value and doesn't lose column type information.  #3987, #6664 [Jonathan Viney, manfred, altano@bigfoot.com]
+
 * Oracle: create_table takes a :sequence_name option to override the 'tablename_seq' default.  #7000 [Michael Schoen]
 
 * MySQL: retain SSL settings on reconnect.  #6976 [randyv2]

activerecord/lib/active_record/connection_adapters/mysql_adapter.rb

@@ -360,7 +360,7 @@ module ActiveRecord
       def change_column_default(table_name, column_name, default) #:nodoc:
         current_type = select_one("SHOW COLUMNS FROM #{table_name} LIKE '#{column_name}'")["Type"]
 
-        change_column(table_name, column_name, current_type, { :default => default })
+        execute("ALTER TABLE #{table_name} CHANGE #{column_name} #{column_name} #{current_type} DEFAULT #{quote(default)}")
       end
 
       def change_column(table_name, column_name, type, options = {}) #:nodoc:

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -349,7 +349,7 @@ module ActiveRecord
       end
 
       def change_column_default(table_name, column_name, default) #:nodoc:
-        execute "ALTER TABLE #{table_name} ALTER COLUMN #{quote_column_name(column_name)} SET DEFAULT '#{default}'"
+        execute "ALTER TABLE #{table_name} ALTER COLUMN #{quote_column_name(column_name)} SET DEFAULT #{quote(default)}"
       end
 
       def rename_column(table_name, column_name, new_column_name) #:nodoc:

activerecord/test/migration_test.rb

@@ -425,14 +425,26 @@ if ActiveRecord::Base.connection.supports_migrations?
     end
 
     def test_change_column_with_new_default
-      Person.connection.add_column "people", "administrator", :boolean, :default => 1
+      Person.connection.add_column "people", "administrator", :boolean, :default => true
       Person.reset_column_information
       assert Person.new.administrator?
 
-      assert_nothing_raised { Person.connection.change_column "people", "administrator", :boolean, :default => 0 }
+      assert_nothing_raised { Person.connection.change_column "people", "administrator", :boolean, :default => false }
       Person.reset_column_information
       assert !Person.new.administrator?
     end
+    
+    def test_change_column_default
+      Person.connection.change_column_default "people", "first_name", "Tester"
+      Person.reset_column_information
+      assert_equal "Tester", Person.new.first_name
+    end
+    
+    def test_change_column_default_to_null
+      Person.connection.change_column_default "people", "first_name", nil
+      Person.reset_column_information
+      assert_nil Person.new.first_name
+    end
 
     def test_add_table
       assert !Reminder.table_exists?