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Fixed weird edge-case with foreign key detection

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It turns out it is possible for a SQLite table to define a foreign key
relationship to a table that does not actually exist

We should still be able to handle these databases.
This commit is contained in:
Simon Willison 2017-11-17 08:18:26 -08:00
commit 0b702f3679
1 changed files with 4 additions and 0 deletions
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4
datasette/utils.py
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@ -219,6 +219,10 @@ def get_all_foreign_keys(conn):
for info in infos: for info in infos:
if info is not None: if info is not None:
id, seq, table_name, from_, to_, on_update, on_delete, match = info id, seq, table_name, from_, to_, on_update, on_delete, match = info
if table_name not in table_to_foreign_keys:
# Weird edge case where something refers to a table that does
# not actually exist
continue
table_to_foreign_keys[table_name]['incoming'].append({ table_to_foreign_keys[table_name]['incoming'].append({
'other_table': table, 'other_table': table,
'column': to_, 'column': to_,