MySQL: omit text/blob defaults from the schema instead of using an empty string. Closes #10963.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8757 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* MySQL: omit text/blob defaults from the schema instead of using an empty string.  #10963 [mdeiters]
+
 * belongs_to supports :dependent => :destroy and :delete.  #10592 [Jonathan Viney]
 
 * Introduce preload query strategy for eager :includes.  #9640 [Frederick Cheung, Aleksey Kondratenko]

activerecord/lib/active_record/connection_adapters/mysql_adapter.rb

@@ -94,7 +94,7 @@ module ActiveRecord
       def extract_default(default)
         if type == :binary || type == :text
           if default.blank?
-            default
+            nil
           else
             raise ArgumentError, "#{type} columns cannot have a default value: #{default.inspect}"
           end

activerecord/test/cases/migration_test.rb

@@ -853,11 +853,7 @@ if ActiveRecord::Base.connection.supports_migrations?
       columns = Person.connection.columns(:binary_testings)
       data_column = columns.detect { |c| c.name == "data" }
 
-      if current_adapter?(:MysqlAdapter)
-        assert_equal '', data_column.default
-      else
-        assert_nil data_column.default
-      end
+      assert_nil data_column.default
 
       Person.connection.drop_table :binary_testings rescue nil
     end

activerecord/test/cases/schema_dumper_test.rb

@@ -84,7 +84,6 @@ if ActiveRecord::Base.connection.respond_to?(:tables)
       assert_no_match %r{create_table "schema_info"}, output
     end
 
-
     def test_schema_dump_with_regexp_ignored_table
       stream = StringIO.new
 
@@ -96,7 +95,6 @@ if ActiveRecord::Base.connection.respond_to?(:tables)
       assert_no_match %r{create_table "schema_info"}, output
     end
 
-
     def test_schema_dump_illegal_ignored_table_value
       stream = StringIO.new
       ActiveRecord::SchemaDumper.ignore_tables = [5]
@@ -108,7 +106,7 @@ if ActiveRecord::Base.connection.respond_to?(:tables)
     if current_adapter?(:MysqlAdapter)
       def test_schema_dump_should_not_add_default_value_for_mysql_text_field
         output = standard_dump
-        assert_match %r{t.text\s+"body",\s+:default => "",\s+:null => false$}, output
+        assert_match %r{t.text\s+"body",\s+:null => false$}, output
       end
 
       def test_mysql_schema_dump_should_honor_nonstandard_primary_keys