# Buggy code
def add_users_to_groups_based_on_users_permissions(apps, schema_editor):
    """Add every user to group with "user_permissions" if exists, else create new one.

    For each user, if the group with the exact scope of permissions exists,
    add the user to it, else create a new group with this scope of permissions
    and add the user to it.
    """
    User = apps.get_model("account", "User")
    Group = apps.get_model("auth", "Group")
    GroupData = namedtuple("GroupData", ["users", "group_name"])

    groups = Group.objects.all().prefetch_related("permissions")

    mapping = create_permissions_mapping(User, GroupData)
    for perms, group_data in mapping.items():
        group = get_group_with_given_permissions(perms, groups)
        users = group_data.users
        if group:
            group.user_set.add(*users)
            continue
        group = create_group_with_given_permissions(perms, group_data.group_name, Group)
        group.user_set.add(*users)


# Traceback (django.db.utils.DataError)
Running migrations:
Applying account.0041_permissions_to_groups...Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/django/db/backends/utils.py", line 86, in _execute
return self.cursor.execute(sql, params)
psycopg2.errors.StringDataRightTruncation: value too long for type character varying(150)
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 395, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python3.8/site-packages/django/core/management/base.py", line 328, in run_from_argv
self.execute(*args, **cmd_options)
File "/usr/local/lib/python3.8/site-packages/django/core/management/base.py", line 369, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python3.8/site-packages/django/core/management/base.py", line 83, in wrapped
res = handle_func(*args, **kwargs)
File "/usr/local/lib/python3.8/site-packages/django/core/management/commands/migrate.py", line 231, in handle
post_migrate_state = executor.migrate(
File "/usr/local/lib/python3.8/site-packages/django/db/migrations/executor.py", line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python3.8/site-packages/django/db/migrations/executor.py", line 147, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python3.8/site-packages/django/db/migrations/executor.py", line 245, in apply_migration
state = migration.apply(state, schema_editor)
File "/usr/local/lib/python3.8/site-packages/django/db/migrations/migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/usr/local/lib/python3.8/site-packages/django/db/migrations/operations/special.py", line 190, in database_forwards
self.code(from_state.apps, schema_editor)
File "/app/saleor/account/migrations/0041_permissions_to_groups.py", line 26, in add_users_to_groups_based_on_users_permissions
group = create_group_with_given_permissions(perms, group_data.group_name, Group)
File "/app/saleor/account/migrations/0041_permissions_to_groups.py", line 65, in create_group_with_given_permissions
group = Group.objects.create(name=group_name)
File "/usr/local/lib/python3.8/site-packages/django/db/models/manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/usr/local/lib/python3.8/site-packages/django/db/models/query.py", line 433, in create
obj.save(force_insert=True, using=self.db)
File "/usr/local/lib/python3.8/site-packages/django/db/models/base.py", line 745, in save
self.save_base(using=using, force_insert=force_insert,
File "/usr/local/lib/python3.8/site-packages/django/db/models/base.py", line 782, in save_base
updated = self._save_table(
File "/usr/local/lib/python3.8/site-packages/django/db/models/base.py", line 887, in _save_table
results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
File "/usr/local/lib/python3.8/site-packages/django/db/models/base.py", line 924, in _do_insert
return manager._insert(
File "/usr/local/lib/python3.8/site-packages/django/db/models/manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/usr/local/lib/python3.8/site-packages/django/db/models/query.py", line 1204, in _insert
return query.get_compiler(using=using).execute_sql(returning_fields)
File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1391, in execute_sql
cursor.execute(sql, params)
File "/usr/local/lib/python3.8/site-packages/django/db/backends/utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/usr/local/lib/python3.8/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "/usr/local/lib/python3.8/site-packages/django/db/backends/utils.py", line 86, in _execute
return self.cursor.execute(sql, params)
File "/usr/local/lib/python3.8/site-packages/django/db/utils.py", line 90, in __exit__
File "/usr/local/lib/python3.8/site-packages/django/db/migrations/executor.py", line 245, in apply_migration
state = migration.apply(state, schema_editor)
File "/usr/local/lib/python3.8/site-packages/django/db/migrations/migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/usr/local/lib/python3.8/site-packages/django/db/migrations/operations/special.py", line 190, in database_forwards
self.code(from_state.apps, schema_editor)
File "/app/saleor/account/migrations/0041_permissions_to_groups.py", line 26, in add_users_to_groups_based_on_users_permissions
group = create_group_with_given_permissions(perms, group_data.group_name, Group)
File "/app/saleor/account/migrations/0041_permissions_to_groups.py", line 65, in create_group_with_given_permissions
group = Group.objects.create(name=group_name)
File "/usr/local/lib/python3.8/site-packages/django/db/models/manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/usr/local/lib/python3.8/site-packages/django/db/models/query.py", line 433, in create
obj.save(force_insert=True, using=self.db)
File "/usr/local/lib/python3.8/site-packages/django/db/models/base.py", line 745, in save
self.save_base(using=using, force_insert=force_insert,
File "/usr/local/lib/python3.8/site-packages/django/db/models/base.py", line 782, in save_base
updated = self._save_table(
File "/usr/local/lib/python3.8/site-packages/django/db/models/base.py", line 887, in _save_table
results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
File "/usr/local/lib/python3.8/site-packages/django/db/models/base.py", line 924, in _do_insert
return manager._insert(
File "/usr/local/lib/python3.8/site-packages/django/db/models/manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/usr/local/lib/python3.8/site-packages/django/db/models/query.py", line 1204, in _insert
return query.get_compiler(using=using).execute_sql(returning_fields)
File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1391, in execute_sql
cursor.execute(sql, params)
File "/usr/local/lib/python3.8/site-packages/django/db/backends/utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/usr/local/lib/python3.8/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "/usr/local/lib/python3.8/site-packages/django/db/backends/utils.py", line 86, in _execute
return self.cursor.execute(sql, params)
File "/usr/local/lib/python3.8/site-packages/django/db/utils.py", line 90, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/usr/local/lib/python3.8/site-packages/django/db/backends/utils.py", line 86, in _execute
return self.cursor.execute(sql, params)
django.db.utils.DataError: value too long for type character varying(150)

# Fixed code
def add_users_to_groups_based_on_users_permissions(apps, schema_editor):
    """Add every user to group with "user_permissions" if exists, else create new one.

    For each user, if the group with the exact scope of permissions exists,
    add the user to it, else create a new group with this scope of permissions
    and add the user to it.
    """
    User = apps.get_model("account", "User")
    Group = apps.get_model("auth", "Group")

    groups = Group.objects.all().prefetch_related("permissions")
    counter = get_counter_value(Group)
    mapping = create_permissions_mapping(User)
    for perms, users in mapping.items():
        group = get_group_with_given_permissions(perms, groups)
        if group:
            group.user_set.add(*users)
            continue
        group = create_group_with_given_permissions(perms, counter, Group)
        group.user_set.add(*users)
        counter += 1