[Metadata composite keys] Typo in error message for invalid primary keys

[frances-h]

Environment Details

Please indicate the following details about the environment in which you found the bug:

• SDV version:
• Python version:
• Operating System:

Error Description

Trying to set a composite primary key with a set of columns that does not contain an ID or PII sdtype column generates the following error: InvalidMetadataError: The primary_keys [['col1', 'col2']] must have a column of type 'id' or another PII type.. Instead, the primary key definition should appear as a single list of columns, not a list of lists.

Steps to reproduce

import pandas as pd
import numpy as np
from sdv.metadata import Metadata

account_metadata = Metadata.load_from_dict({
    'tables': {
        'accounts': {
            'columns': {
                'user_id': {'sdtype': 'id', 'regex_format': 'ID_[0-9]{1,2}'},
                'account_type': {'sdtype': 'categorical'},
                'col1': {'sdtype': 'numerical'},
                'col2': {'sdtype': 'numerical'},
            }
        }
    }
})

account_metadata.set_primary_key(['col1', 'col2'])

[nightcityblade]

Hi, I'd like to work on this. I'll submit a PR shortly.

[nightcityblade]

After investigating, I'm unable to reproduce the exact error message described. The code at single_table.py:792 seems to produce a flat list, not a nested one. I'll step back from this issue — it may require a specific SDV version to reproduce.