Python django.db.migrations 模块，RenameField() 实例源码

def test_rename_field(self):
        project_state = self.set_up_test_model()
        operation = migrations.RenameField('Pony', 'pink', 'rosa')
        new_state = project_state.clone()
        operation.state_forwards('tests', new_state)
        self.assertColumnExists('tests_pony', 'pink')
        self.assertColumnNotExists('tests_pony', 'rosa')
        with connection.schema_editor() as editor:
            operation.database_forwards('tests', editor, project_state, new_state)
        self.assertColumnNotExists('tests_pony', 'pink')
        self.assertColumnExists('tests_pony', 'rosa')
        with connection.schema_editor() as editor:
            operation.database_backwards('tests', editor, new_state, project_state)
        self.assertColumnExists('tests_pony', 'pink')
        self.assertColumnNotExists('tests_pony', 'rosa')

def rename_field(field, filters: List[str]):
    """Renames a field from one name to the other.

    Arguments:
        field:
            Field to be renamed.

        filters:
            List of strings to filter
            SQL statements on.
    """

    model = define_fake_model({'title': field})
    project = migrations.state.ProjectState.from_apps(apps)

    with connection.schema_editor() as schema_editor:
        execute_migration(schema_editor, [
            migrations.CreateModel(
                model.__name__,
                fields=[
                    ('title', field.clone())
                ]
            )
        ], project)

    with filtered_schema_editor(*filters) as (schema_editor, calls):
        execute_migration(schema_editor, [
            migrations.RenameField(
                model.__name__,
                'title',
                'newtitle'
            )
        ], project)

    yield calls

def reduce_rename_field_self(self, operation, other, in_between):
        if (operation.model_name_lower == other.model_name_lower and
                operation.new_name_lower == other.old_name_lower):
            return [
                migrations.RenameField(
                    operation.model_name,
                    operation.old_name,
                    other.new_name,
                ),
            ]

    # THROUGH CHECKS