šŸ‘ https://github.com/rails/rails/issues/37555

I did find a few similar issues, but they all got marked as stale

https://github.com/rails/rails/issues/34408
https://github.com/rails/rails/issues/31996
https://github.com/rails/rails/issues/34093

I'm surprised this doesn't appear to be a bigger problem. Perhaps I'm not 
supposed to fragment cache my paginated results. Using collection caching 
(`render collection: @posts, cached: true`) might be performant enough.

On Sunday, October 27, 2019 at 2:55:18 PM UTC+1, richard schneeman wrote:
>
> Sounds like a bug. Can you move into an issue? 
>
>
>
> On Thu, Oct 24, 2019 at 7:52 PM Marc Kƶhlbrugge <h...@marckohlbrugge.com 
> <javascript:>> wrote:
>
>> I'm running into a problem when using fragment caching with active record 
>> collections.
>>
>> Rails 6 uses a combination of collection.cache_key and 
>> collection.cache_version to determine whether a fragment cache is fresh or 
>> not. However, there is a scenario where the collection might change while 
>> collection.cache_key and collection.cache_version stay the same.
>>
>> It happens when you use a limit on the collection and then destroy one of 
>> those records, as long as it's not the most recent one. This way 
>> collection.cache_key will stay the same, because the query does not change. 
>> And collection.cache_version will stay the same as well, because the 
>> collection count will remain unchanged as does the maximum updated_at 
>> timestamp of the most recent record.
>>
>> I've build a sample app for demonstration purposes:
>>
>> https://github.com/marckohlbrugge/rails-6-collection-caching-bug
>>
>> The readme describes a way to reproduce the issue via the website itself, 
>> or the Rails console.
>>
>> Would this be considered a bug or expected behavior? Are there any known 
>> work arounds?
>>
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>>
> -- 
> Richard Schneeman
> https://www.schneems.com
>

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