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docs: add missing ::regclass cast error to troubleshooting #16

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21 changes: 21 additions & 0 deletions docs/user_guide/troubleshooting.mdx
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Expand Up @@ -2,6 +2,27 @@

Use this page to map symptoms to status checks and recovery actions.

## Function Does Not Exist (Type Cast Error)

Symptom:

```text
ERROR: function graph.add_table(unknown, unknown) does not exist
HINT: No function matches the given name and argument types. You might need to add explicit type casts.
```

Check:

Are you passing a table name as a plain string, such as `'public.users'`?

Fix:

pgGraph's table registration functions require PostgreSQL Object Identifiers (OIDs), not plain text strings. Add the `::regclass` cast to the table name argument:

```sql
SELECT graph.add_table('public.users'::regclass, 'id');
```

## Graph Not Built

Symptom:
Expand Down