from django.db.models.sql import compiler

class SQLCompiler(compiler.SQLCompiler):

    def resolve_columns(self, row, fields=()):

        values = []

        index_extra_select = len(self.query.extra_select.keys())

        for value, field in map(None, row[index_extra_select:], fields):

            if (field and field.get_internal_type() in ("BooleanField", "NullBooleanField") and

                value in (0, 1)):

                value = bool(value)

            values.append(value)

        return row[:index_extra_select] + tuple(values)

class SQLInsertCompiler(compiler.SQLInsertCompiler, SQLCompiler):

    pass

class SQLDeleteCompiler(compiler.SQLDeleteCompiler, SQLCompiler):

    pass

class SQLUpdateCompiler(compiler.SQLUpdateCompiler, SQLCompiler):

    pass

class SQLAggregateCompiler(compiler.SQLAggregateCompiler, SQLCompiler):

    pass

class SQLDateCompiler(compiler.SQLDateCompiler, SQLCompiler):

    pass