Caching keys lack sub second precision
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调研方向
首先定位默认的缓存键构建器以及 Rails updated_at 值的处理方式。以间隔不到一秒的时间对同一条记录执行两次变更，然后验证生成的缓存键保留亚秒级精度，并确认该回归问题已由测试覆盖。
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This issue is a (choose one):
- Problem/bug report.
- Feature request.
- Request for support. Note: Please try to avoid submitting issues for support requests. Use Gitter instead.
Checklist before submitting:
- I've searched for an existing issue.
- I've asked my question on Gitter and have not received a satisfactory answer.
- I've included a complete bug report template. This step helps us and allows us to see the bug without trying to reproduce the problem from your description. It helps you because you will frequently detect if it's a problem specific to your project.
- The feature I'm asking for is compliant with the JSON:API spec.
Description
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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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