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simonw / datasette-graphql

Datasette plugin providing an automatic GraphQL API for your SQLite databases
https://datasette-graphql-demo.datasette.io/
Apache License 2.0
101 stars 6 forks source link

KeyError / status 500 for table with references #79

Closed curiousleo closed 3 years ago

curiousleo commented 3 years ago

Error message

Traceback (most recent call last):
  [...]
  File "/usr/local/lib/python3.9/site-packages/graphql/type/definition.py", line 212, in define_field_map
    field_map = field_map()
  File "/usr/local/lib/python3.9/site-packages/graphene/types/typemap.py", line 275, in construct_fields_for_type
    map = self.reducer(map, field.type)
  File "/usr/local/lib/python3.9/site-packages/graphene/types/field.py", line 119, in type
    return get_type(self._type)
  File "/usr/local/lib/python3.9/site-packages/graphene/types/utils.py", line 45, in get_type
    return _type()
  File "/usr/local/lib/python3.9/site-packages/datasette_graphql/utils.py", line 624, in getter
    return table_classes[table]
KeyError: 'Katalogwerte'
INFO:     172.17.0.1:43848 - "GET /Marktstammdatenregister/EinheitenSolar HTTP/1.1" 500 Internal Server Error

Full stack trace: traceback.txt

SQL schema

This happens when I try to open the page of a table "EinheitenSolar". It relates to the table "Katalogwerte" (mentioned in the traceback) in that the "EinheitenSolar" table contains columns which reference "Katalogwerte":

create table 'EinheitenSolar' (
  -- [...]
  'Land' integer not null references Katalogwerte(Id) deferrable initially deferred,
  'Bundesland' integer references Katalogwerte(Id) deferrable initially deferred,
  -- [...]

Note that without the GraphQL plugin, Datasette recognises the references declarations and displays the label_column as expected. So the tables themselves seem to have a structure that Datasette can generally work with, it's just this plugin that is unhappy.

Full SQL for "EinheitenSolar": EinheitenSolar.sql.txt

Screenshot

image

Versions

$ pip list | grep -E 'datasette(-graphql)?\s'
datasette                 0.58.1
datasette-graphql         1.5
simonw commented 3 years ago

Thanks for the SQL file. I could replicate this bug locally like so:

wget https://github.com/simonw/datasette-graphql/files/7360568/EinheitenSolar.sql.txt
sqlite3 einheit.db < EinheitenSolar.sql.txt
datasette einheit.db
simonw commented 3 years ago

OK, I see what is happening here. There's only one table in that file, but it's CREATE TABLE refers to other tables which don't currently exist.

I'm a little surprised that Datasette doesn't throw errors there to be honest - good that it doesn't!

I think I can fix this in the introspect_tables() function:

https://github.com/simonw/datasette-graphql/blob/0b107eb95fca2ad0d1a15d83786c2b50313b8655/datasette_graphql/utils.py#L653-L680