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Rails is clever enough to handle common cases so you don't have to specify anything.

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For example, if you wanted to cache each product on a page, you could use this code: has changed, a new key will be generated.

Then Rails will write a new cache to that key, and the old cache written to the old key will never be used again. Cache fragments will also be expired when the view fragment changes (e.g., the HTML in the view changes).

The string of characters at the end of the key is a template tree digest.

It is an MD5 hash computed based on the contents of the view fragment you are caching.

In case of cache hit, the cached value will be returned without executing the block. In general, when you use low-level caching for instance level information, you need to generate a cache key.

Query caching is a Rails feature that caches the result set returned by each query.When different parts of the page need to be cached and expired separately you can use Fragment Caching.Fragment Caching allows a fragment of view logic to be wrapped in a cache block and served out of the cache store when the next request comes in.Apache or NGINX) without having to go through the entire Rails stack.While this is super fast it can't be applied to every situation (such as pages that need authentication).If you change the view fragment, the MD5 hash will change, expiring the existing file.

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