From 30370227890dc950f1544b7b1040aa75e505f877 Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Mon, 14 Jul 2008 10:12:54 -0500
Subject: Fixed that create database statements would always include "DEFAULT
 NULL" (Nick Sieger) [#334 status:committed]

---
 activerecord/CHANGELOG                             |  2 ++
 .../abstract/schema_definitions.rb                 |  5 ++-
 activerecord/test/cases/column_definition_test.rb  | 36 ++++++++++++++++++++++
 3 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 activerecord/test/cases/column_definition_test.rb

diff --git a/activerecord/CHANGELOG b/activerecord/CHANGELOG
index 56b1781537..17430ba0b7 100644
--- a/activerecord/CHANGELOG
+++ b/activerecord/CHANGELOG
@@ -1,5 +1,7 @@
 *Edge*
 
+* Fixed that create database statements would always include "DEFAULT NULL" (Nick Sieger) [#334]
+
 * Add :accessible option to associations for allowing (opt-in) mass assignment. #474. [David Dollar] Example :
 
   class Post < ActiveRecord::Base
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
index d4c8a80448..13ccfea0b8 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
@@ -257,7 +257,10 @@ module ActiveRecord
 
       def to_sql
         column_sql = "#{base.quote_column_name(name)} #{sql_type}"
-        add_column_options!(column_sql, :null => null, :default => default) unless type.to_sym == :primary_key
+        column_options = {}
+        column_options[:null] = null unless null.nil?
+        column_options[:default] = default unless default.nil?
+        add_column_options!(column_sql, column_options) unless type.to_sym == :primary_key
         column_sql
       end
       alias to_s :to_sql
diff --git a/activerecord/test/cases/column_definition_test.rb b/activerecord/test/cases/column_definition_test.rb
new file mode 100644
index 0000000000..540f42f4b6
--- /dev/null
+++ b/activerecord/test/cases/column_definition_test.rb
@@ -0,0 +1,36 @@
+require "cases/helper"
+
+class ColumnDefinitionTest < ActiveRecord::TestCase
+  def setup
+    @adapter = ActiveRecord::ConnectionAdapters::AbstractAdapter.new(nil)
+    def @adapter.native_database_types
+      {:string => "varchar"}
+    end
+  end
+
+  # Avoid column definitions in create table statements like:
+  # `title` varchar(255) DEFAULT NULL NULL
+  def test_should_not_include_default_clause_when_default_is_null
+    column = ActiveRecord::ConnectionAdapters::Column.new("title", nil, "varchar(20)")
+    column_def = ActiveRecord::ConnectionAdapters::ColumnDefinition.new(
+      @adapter, column.name, "string",
+      column.limit, column.precision, column.scale, column.default, column.null)
+    assert_equal "title varchar(20) NULL", column_def.to_sql
+  end
+
+  def test_should_include_default_clause_when_default_is_present
+    column = ActiveRecord::ConnectionAdapters::Column.new("title", "Hello", "varchar(20)")
+    column_def = ActiveRecord::ConnectionAdapters::ColumnDefinition.new(
+      @adapter, column.name, "string",
+      column.limit, column.precision, column.scale, column.default, column.null)
+    assert_equal %Q{title varchar(20) DEFAULT 'Hello' NULL}, column_def.to_sql
+  end
+
+  def test_should_specify_not_null_if_null_option_is_false
+    column = ActiveRecord::ConnectionAdapters::Column.new("title", "Hello", "varchar(20)", false)
+    column_def = ActiveRecord::ConnectionAdapters::ColumnDefinition.new(
+      @adapter, column.name, "string",
+      column.limit, column.precision, column.scale, column.default, column.null)
+    assert_equal %Q{title varchar(20) DEFAULT 'Hello' NOT NULL}, column_def.to_sql
+  end
+end
\ No newline at end of file
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