def alter_field(self, model, old_field, new_field, strict=False):
super(SchemaEditor, self).alter_field(<EOL>model, old_field, new_field, strict<EOL>)<EOL>for mixin in self.post_processing_mixins:<EOL><INDENT>mixin.alter_field(<EOL>model, old_field, new_field, strict<EOL>)<EOL><DEDENT>
Ran when the configuration on a field changed.