Better default name for migrations we can't give nice names to

import re

import datetime

from django.db.migrations import operations

from django.db.migrations.migration import Migration

    def suggest_name(cls, ops):

        """

        Given a set of operations, suggests a name for the migration

        they might represent. Names not guaranteed to be unique; they

        must be prefixed by a number or date.

        they might represent. Names are not guaranteed to be unique,

        but we put some effort in to the fallback name to avoid VCS conflicts

        if we can.

        """

        if len(ops) == 1:

            if isinstance(ops[0], operations.CreateModel):

                return "remove_%s_%s" % (ops[0].model_name.lower(), ops[0].name.lower())

        elif all(isinstance(o, operations.CreateModel) for o in ops):

            return "_".join(sorted(o.name.lower() for o in ops))

        return "auto"

        return "auto_%s" % datetime.datetime.now().strftime("%Y%m%d_%H%M")

    @classmethod

    def parse_number(cls, name):