fetch with multiple queries doesn't seem to work

[endsley]

I have 2 commands

student = db.fetch({'key': key1})
and
students = db.fetch( [ {'key': key1}, {'key': key2} )

the 1st one works but the 2nd one doesn't and gives me an error (shown below). I guess I could make 1 query at a time, but that's rather inefficient. Any help would be great.

Traceback (most recent call last):
File "/home/chieh/.local/lib/python3.8/site-packages/streamlit/runtime/scriptrunner/script_runner.py", line 565, in _run_script
exec(code, module.dict)
File "/home/chieh/code/streamlit_teaching_materials/pages/teacher_course_page.py", line 51, in
student2 = db.fetch([{'key':student_keys[0]}, {'key':student_keys[1]}, {'key':student_keys[2]}]).items
File "/home/chieh/.local/lib/python3.8/site-packages/deta/base.py", line 203, in fetch
_, res = self._fetch(query, limit, last)
File "/home/chieh/.local/lib/python3.8/site-packages/deta/base.py", line 189, in _fetch
code, res = self._request("/query", "POST", payload, content_type=JSON_MIME)
File "/home/chieh/.local/lib/python3.8/site-packages/deta/service.py", line 85, in _request
raise urllib.error.HTTPError(url, status, res.reason, res.headers, res.fp)
urllib.error.HTTPError: HTTP Error 400: Bad Request
Exception in thread ScriptRunner.scriptThread:
Traceback (most recent call last):
File "/home/chieh/.local/lib/python3.8/site-packages/streamlit/runtime/scriptrunner/script_runner.py", line 565, in _run_script
exec(code, module.dict)
File "/home/chieh/code/streamlit_teaching_materials/pages/teacher_course_page.py", line 51, in
student2 = db.fetch([{'key':student_keys[0]}, {'key':student_keys[1]}, {'key':student_keys[2]}]).items
File "/home/chieh/.local/lib/python3.8/site-packages/deta/base.py", line 203, in fetch
_, res = self._fetch(query, limit, last)
File "/home/chieh/.local/lib/python3.8/site-packages/deta/base.py", line 189, in _fetch
code, res = self._request("/query", "POST", payload, content_type=JSON_MIME)
File "/home/chieh/.local/lib/python3.8/site-packages/deta/service.py", line 85, in _request
raise urllib.error.HTTPError(url, status, res.reason, res.headers, res.fp)
urllib.error.HTTPError: HTTP Error 400: Bad Request

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
self.run()
File "/usr/lib/python3.8/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "/home/chieh/.local/lib/python3.8/site-packages/streamlit/runtime/scriptrunner/script_runner.py", line 299, in _run_script_thread
self._run_script(request.rerun_data)
File "/home/chieh/.local/lib/python3.8/site-packages/streamlit/runtime/scriptrunner/script_runner.py", line 616, in _run_script
self._run_script(rerun_exception_data)
File "/home/chieh/.local/lib/python3.8/site-packages/streamlit/runtime/scriptrunner/script_runner.py", line 578, in _run_script
handle_uncaught_app_exception(uncaught_exception)
File "/home/chieh/.local/lib/python3.8/site-packages/streamlit/error_util.py", line 96, in handle_uncaught_app_exception
st.exception(ex)
File "/home/chieh/.local/lib/python3.8/site-packages/streamlit/runtime/metrics_util.py", line 311, in wrapped_func
result = non_optional_func(*args, **kwargs)
File "/home/chieh/.local/lib/python3.8/site-packages/streamlit/elements/exception.py", line 68, in exception
marshall(exception_proto, exception)
File "/home/chieh/.local/lib/python3.8/site-packages/streamlit/elements/exception.py", line 105, in marshall
if getattr(exception, "alternate_name", None) is not None:
File "/usr/lib/python3.8/tempfile.py", line 606, in getattr
file = self.dict['file']
KeyError: 'file'

[lemonyte]

You need to consider the following when querying on keys:
The keys must be strings hence the operation values must also be strings.
The contains and not-contains operators are not supported.
The AND and OR operations for different query values are not supported.

https://deta.space/docs/en/build/reference/deta-base/queries