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Ensure QuantumCircuit.metadata is always a dict #1761

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merged 5 commits into from
Mar 27, 2023
Merged

Ensure QuantumCircuit.metadata is always a dict #1761

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eb20501
Ensure QuantumCircuit.metadata is always a dict
ihincks Mar 24, 2023
3b40512
fix order
ihincks Mar 24, 2023
5c5e0a9
fix typo :(
ihincks Mar 24, 2023
2e6141a
revert object->object() change
ihincks Mar 27, 2023
89e8ba9
make backportable
ihincks Mar 27, 2023
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12 changes: 6 additions & 6 deletions qiskit_aer/backends/aerbackend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -426,13 +426,13 @@ def _execute_circuits_job(self, circuits, noise_model, config, job_id="", format
# Take metadata from headers of experiments to work around JSON serialization error
metadata_list = []
for idx, circ in enumerate(circuits):
metadata_list.append(circ.metadata)
# TODO: we test for True-like on purpose here to condition against both None and {},
# which allows us to support versions of Terra before and after QuantumCircuit.metadata
# accepts None as a valid value. This logic should be revisited after terra>=0.24.0 is
# required.
if circ.metadata:
metadata = circ.metadata
metadata_list.append(metadata)
circ.metadata = {}
circ.metadata["metadata_index"] = idx
else:
metadata_list.append(None)
circ.metadata = {"metadata_index": idx}

# Run simulation
aer_circuits = assemble_circuits(circuits)
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