doccano/app/server/management/commands/create_role_mapping.py

from api.models import Project, Role, RoleMapping, User
from django.core.management.base import BaseCommand, CommandError


class Command(BaseCommand):
    help = 'Non-interactively create a rolemapping'

    @classmethod
    def add_arguments(self, parser):
        parser.add_argument('--rolename', default=None,
                            help='The name of the role.')
        parser.add_argument('--username', default=None,
                            help='The name of the user.')
        parser.add_argument('--projectname', default=None,
                            help='The name of the project.')

    def handle(self, *args, **options):
        rolename = options.get('rolename')
        username = options.get('username')
        projectname = options.get('projectname')

        if not rolename or not username or not projectname:
            raise CommandError('--rolename  --projectname  --username are required for the rolemapping')

        if rolename and projectname and username:
            try:
                role = Role.objects.get(name=rolename)
                user = User.objects.get(username=username)
                project = Project.objects.get(name=projectname)
                rolemapping = RoleMapping.objects.create(role_id=role.id, user_id=user.id, project_id=project.id)
            except Exception as ex:
                self.stderr.write(self.style.ERROR('Error occurred while creating rolemapping "%s"' % ex))
            else:
                self.stdout.write(self.style.SUCCESS('Rolemapping created successfully "%s"' % rolemapping.id))