`pw_migrate migrate` fails when changing fields against Postgresql

[Bogdan Dragomirescu]

Happens with peewee-migrate version 1.0.0 (tested against multiple peewee versions from the latest one (3.6.4) backwards, didn't find any where this doesn't occur).
Error:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/peewee_migrate/router.py", line 144, in run_one
    migrator.run()
  File "/usr/local/lib/python2.7/site-packages/peewee_migrate/migrator.py", line 129, in run
    op.run()
  File "/usr/local/lib/python2.7/site-packages/playhouse/migrate.py", line 141, in run
    self._handle_result(method(*self.args, **kwargs))
  File "/usr/local/lib/python2.7/site-packages/playhouse/migrate.py", line 149, in inner
    return fn(self, *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/peewee_migrate/migrator.py", line 36, in change_column
    operations = [self.alter_change_column(table, column_name, field)]
  File "/usr/local/lib/python2.7/site-packages/peewee_migrate/migrator.py", line 81, in alter_change_column
    field_clause = clause.nodes[-1]
AttributeError: 'Context' object has no attribute 'nodes'

Other details:
OS: Ubuntu 16.04
Setup: docker version 18.06.0-ce; docker-compose version 1.8.0; Python 2.7; postgresql version 9.6
Steps:

1. Create model with a few fields

class PgTest(Model):
    class Meta:
        database = psql_client.db
        table_function = lambda model_cls: '{model_name}'.format(model_name=model_cls.__name__.lower())

    id = AutoField()
    name = CharField(max_length=100, index=True)

2. Create migration, and migrate it
   $ pw_migrate create --auto test.models --directory test/migrations --database postgresql://postgres@postgres:5432/postgres test
$ pw_migrate migrate --directory test/migrations --database postgresql://postgres@postgres:5432/datalake --name 001_test

3. Back to the model, alter max_length on the name field, generate new migration

4. Migrate the new migration, result is the traceback above.

[Roman Inflianskas]

Can reproduce it on PostgreSQL database with latest peewee and peewee_migrate.

[Oleksandr Pikovets]

Same for me. Is there any chance it can be fixed some time soon?

[Carlos Bautista]

Hey yall, looks like this particular issue was fixed. I came across this issue while reporting #135. I followed the steps in the top description and the max_length was successfully changed.

I feel like this particular issue can probably be closed.