Improve keyFields
error behavior when primary key fields are missing
#8679
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Building on #8678 (only because it touches the same code), this PR seeks to improve the way
computeKeyFieldsObject
behaves when it fails, in two ways:cache.identify
method (which ultimately callscomputeKeyFieldsObject
whenkeyFields
is configured) will no longer throw under any circumstances, instead returning undefined to indicate failure (as usual).computeKeyFieldsObject
fails will now include the object that was missing the desired field, making it much easier to tell why the error happened (as suggested by @jorbuedo in keyFields mismatch with query leads to hard Invariant Violation crash #6673 (comment)).This may not be a full solution to #6673, but I'm sure it will help.