Unifies mysql and mysql2 casting of booleans.

Author: senny

activerecord/CHANGELOG.md

@@ -1,3 +1,10 @@
+*   Unify boolean type casting for `MysqlAdapter` and `Mysql2Adapter`.
+    `type_cast` will return `1` for `true` and `0` for `false`.
+
+    Fixes #11119.
+
+    *Adam Williams*, *Yves Senn*
+
 *   Fix bug where has_one associaton record update result in crash, when replaced with itself.
 
     Fixes #12834.

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -206,6 +206,12 @@ def supports_index_sort_order?
         true
       end
 
+      def type_cast(value, column)
+        return super unless value == true || value == false
+
+        value ? 1 : 0
+      end
+
       # MySQL 4 technically support transaction isolation, but it is affected by a bug
       # where the transaction level gets persisted for the whole session:
       #

activerecord/lib/active_record/connection_adapters/mysql_adapter.rb

@@ -160,12 +160,6 @@ def error_number(exception) # :nodoc:
 
       # QUOTING ==================================================
 
-      def type_cast(value, column)
-        return super unless value == true || value == false
-
-        value ? 1 : 0
-      end
-
       def quote_string(string) #:nodoc:
         @connection.quote(string)
       end

activerecord/test/cases/adapters/mysql2/boolean_test.rb

@@ -46,8 +46,8 @@ class BooleanType < ActiveRecord::Base
     assert_equal 1, attributes["archived"]
     assert_equal "1", attributes["published"]
 
-    assert_equal "t", @connection.type_cast(true, boolean_column)
-    assert_equal "t", @connection.type_cast(true, string_column)
+    assert_equal 1, @connection.type_cast(true, boolean_column)
+    assert_equal 1, @connection.type_cast(true, string_column)
   end
 
   test "test type casting without emulated booleans" do
@@ -60,7 +60,7 @@ class BooleanType < ActiveRecord::Base
     assert_equal "1", attributes["published"]
 
     assert_equal 1, @connection.type_cast(true, boolean_column)
-    assert_equal "t", @connection.type_cast(true, string_column)
+    assert_equal 1, @connection.type_cast(true, string_column)
   end
 
   test "with booleans stored as 1 and 0" do