apollo-cache-control: consider hintless root fields to be uncached #2210
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This is consistent with the old engineproxy interpretation of cache hints. We special-case scalar fields to inherit their parent field's hints for simplicity (so you don't have to hint every scalar field in a hinted object), but when the parent field is non-root that inherited hint gets defaultMaxAge applied to it. When the parent field is the root, that inherited hint doesn't get defaultMaxAge applied because we don't run willResolveField for the root query. Includes a CHANGELOG update for #2197.
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This is consistent with the old engineproxy interpretation of cache hints. We
special-case scalar fields to inherit their parent field's hints for
simplicity (so you don't have to hint every scalar field in a hinted object),
but when the parent field is non-root that inherited hint gets defaultMaxAge
applied to it. When the parent field is the root, that inherited hint doesn't
get defaultMaxAge applied because we don't run willResolveField for the root
query.
Includes a CHANGELOG update for #2197.