column default extraction should handle newlines.

Fixes #7374

activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb

@@ -380,9 +380,9 @@ def columns(table_name) #:nodoc:
           case field["dflt_value"]
           when /^null$/i
             field["dflt_value"] = nil
-          when /^'(.*)'$/
+          when /^'(.*)'$/m
             field["dflt_value"] = $1.gsub("''", "'")
-          when /^"(.*)"$/
+          when /^"(.*)"$/m
             field["dflt_value"] = $1.gsub('""', '"')
           end
 

activerecord/test/cases/migration/column_attributes_test.rb

@@ -7,6 +7,14 @@ class ColumnAttributesTest < ActiveRecord::TestCase
 
       self.use_transactional_fixtures = false
 
+      def test_add_column_newline_default
+        string = "foo\nbar"
+        add_column 'test_models', 'command', :string, :default => string
+        TestModel.reset_column_information
+
+        assert_equal string, TestModel.new.command
+      end
+
       def test_add_remove_single_field_using_string_arguments
         refute TestModel.column_methods_hash.key?(:last_name)