Deal with MySQL's quirky handling of defaults and blob/text columns

[#1043 state:committed]

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

1 files changed, 31 insertions, 0 deletions

diff --git a/activerecord/test/cases/defaults_test.rb b/activerecord/test/cases/defaults_test.rb
index 3473b846a0..ee84cb8af8 100644
--- a/activerecord/test/cases/defaults_test.rb
+++ b/activerecord/test/cases/defaults_test.rb
@@ -19,6 +19,37 @@ class DefaultTest < ActiveRecord::TestCase
   end
 
   if current_adapter?(:MysqlAdapter)
+
+    #MySQL 5 and higher is quirky with not null text/blob columns.
+    #With MySQL Text/blob columns cannot have defaults. If the column is not null MySQL will report that the column has a null default
+    #but it behaves as though the column had a default of ''
+    def test_mysql_text_not_null_defaults
+      klass = Class.new(ActiveRecord::Base)
+      klass.table_name = 'test_mysql_text_not_null_defaults'
+      klass.connection.create_table klass.table_name do |t|
+        t.column :non_null_text, :text, :null => false
+        t.column :non_null_blob, :blob, :null => false
+        t.column :null_text, :text, :null => true
+        t.column :null_blob, :blob, :null => true
+      end
+      assert_equal '', klass.columns_hash['non_null_blob'].default
+      assert_equal '', klass.columns_hash['non_null_text'].default
+
+      assert_equal nil, klass.columns_hash['null_blob'].default
+      assert_equal nil, klass.columns_hash['null_text'].default
+
+      assert_nothing_raised do
+        instance = klass.create!
+        assert_equal '', instance.non_null_text
+        assert_equal '', instance.non_null_blob
+        assert_nil instance.null_text
+        assert_nil instance.null_blob
+      end
+    ensure
+      klass.connection.drop_table(klass.table_name) rescue nil
+    end
+
+
     # MySQL uses an implicit default 0 rather than NULL unless in strict mode.
     # We use an implicit NULL so schema.rb is compatible with other databases.
     def test_mysql_integer_not_null_defaults