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verbosify cirq_type deprecation #5339

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Merged
merged 5 commits into from
May 20, 2022
Merged

verbosify cirq_type deprecation #5339

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5921b73
verbosify cirq_type deprecation
95-martin-orion May 9, 2022
1034ac9
-vv
95-martin-orion May 9, 2022
d10e892
-vvv
95-martin-orion May 10, 2022
6627d9c
point at custom resolver docs
95-martin-orion May 13, 2022
e4344cb
Merge branch 'master' into verbose-cirq-type-depr
CirqBot May 20, 2022
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15 changes: 12 additions & 3 deletions cirq-core/cirq/protocols/json_serialization.py
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Original file line number Diff line number Diff line change
Expand Up @@ -283,9 +283,18 @@ def _json_dict_with_cirq_type(obj: Any):
if 'cirq_type' in base_dict:
# TODO: upgrade to ValueError in v0.15
warnings.warn(
f"Found 'cirq_type': '{base_dict['cirq_type']}' in _json_dict_. "
f"Custom values of this field are not permitted, and will produce "
"an error starting in Cirq v0.15.",
f"Found 'cirq_type': '{base_dict['cirq_type']}' in user-specified _json_dict_. "
"'cirq_type' is now automatically generated from the class's name and its "
"_json_namespace_ method as `cirq_type: '[<namespace>.]<class_name>'`."
"\n\n"
"Starting in v0.15, custom 'cirq_type' values will trigger an error. "
"To fix this, remove 'cirq_type' from the class _json_dict_ method and "
"define _json_namespace_ for the class."
"\n\n"
"For backwards compatibility, third-party classes whose old 'cirq_type' value "
"does not match the new value must appear under BOTH values in the resolver "
"for that package. For details on defining custom resolvers, see the "
"DEFAULT_RESOLVER docstring in cirq-core/cirq/protocols/json_serialization.py.",
DeprecationWarning,
)
return base_dict
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