Remove support for delete_matched

[djmb]

delete_matched is optional, it may be removed in Rails 8.0 and relies on the index on the key column which will be removed in future.

[skatkov]

This is great. After this gets merged, what will be next that should be resolved ? Hash index #94 or you will working on constraining cache storage to certain size #116 ?

[djmb]

Hey @skatkov! I'll be working on the changes for key_hash next. It will include the migrations for size estimation as well so we only need one set of migrations.

The changes are straightforward, but the main problem will the migration steps for existing users. I'll be working through those and testing them out on our apps.

[skatkov]

Do you need any assistance with key_hash @djmb?

[djmb]

@skatkov - I'll have something ready for it next week. We can then look at if a postgresql hash index fits in to what we've got.

[namolnad]

Hi there, I was previously using delete_matched until upgrading recently. After poking around a bit, I'm not seeing a good way to continue doing some of the things I was using solid_cache for. Namely, caching counts based on a the organization performing the query (org id used as a namespace) and the ActiveRecord cache_key to set the cache key for the filters which were applied for the query.

It appears that I can't even use a namespace to clear cache entries and will instead have to know the exact cache key. Am I correct in that assumption or is there some workaround/functionality I'm missing. Thanks!

[djmb]

Hey @namolnad!

I removed delete_matched support as it requires a large index, and it's likely to be removed from the API for Rails 8, though I don't think that's official.

You can add support back in yourself though by:

1. Adding an index on the key column
2. Deleting entries directly with something like SolidCache::Entry.where("key like 'prefix%'").delete_in_batches

[namolnad]

@djmb thanks so much for the quick follow up and the workaround — I'll see if I can rework how I'm doing things, but this workaround may come in handy!