models.py 文件源码

def _check_max_source_dimensions(cls, **kwargs):
        if not cls.MAX_SOURCE_DIMENSIONS:
            return [
                checks.Error(
                    'MAX_SOURCE_DIMENSIONS is required',
                    obj=cls
                )
            ]
        elif not is_size(cls.MAX_SOURCE_DIMENSIONS):
            return [
                checks.Error(
                    'MAX_SOURCE_DIMENSIONS must be a tuple of 2 non-negative numbers',
                    obj=cls
                )
            ]
        else:
            return []