Confusing error if metadata.json contains nested data #2403
Description
Create an invalid metadata.json file like this:
{"settings": {"trace_debug": 1}}And start Datasette like so:
datasette -m metadata.jsonDatasette appears to start correctly, but when you attempt to load any page you get this error:
Error binding parameter 1 - probably unsupported type
I ran datasette -m metadata.json --get / --pdb and found that the problem was here:
126 async def execute_write(self, sql, params=None, block=True):
127 def _inner(conn):
128 -> return conn.execute(sql, params or [])
129
130 with trace("sql", database=self.name, sql=sql.strip(), params=params):
131 results = await self.execute_write_fn(_inner, block=block)
132 return results
133
(Pdb) print(sql)
INSERT INTO metadata_instance(key, value)
VALUES(?, ?)
ON CONFLICT(key) DO UPDATE SET value = excluded.value;
(Pdb) params
['settings', {'trace_debug': 1}]