Caching keys lack sub second precision
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 55/100
Research direction
Start by locating the default cache-key builder and the handling of Rails updated_at values. Reproduce two record mutations less than a second apart, then verify that the resulting cache keys preserve sub-second precision and that the regression is covered by a test.
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Description
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- Problem/bug report.
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- The feature I'm asking for is compliant with the JSON:API spec.
Description
Choose one section below and delete the other:
Bug reports:
The mechanism for building a cache key by default uses the rails updated_at field, which when stringified truncates the millisecond precision, which means that if two requests arrive and mutate a record in less than a second, the first write will win - which is the exact opposite of what you would want.
This is the monkey patched fix we've deployed
keys = cache_ids.map do |(id, cache_key)|
# If the cache key is a time object make it a high precision time object
if cache_key.is_a? Time
cache_key = cache_key.iso8601(4)
end
[type, id, cache_key, serializer_config_key, context_key]
end
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- Ruby
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