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tvdeyen
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Introduce a new service that preloads element trees efficiently, eliminating N+1 queries for nested elements at any depth. Add alchemy_element_preloads hook to RelatableResource concern. This can be used for eager loading ie. picture thumbnails.
Replace recursive N+1 query pattern with single-query
When all_nested_elements is already loaded (via ElementTreePreloader), use the preloaded data instead of querying the database. This avoids N+1 queries when re-initializing TinyMCE editors in the element editor.
When rendering element editors, each picture's thumbnail_url was triggering an individual query to find the thumb by signature. Now thumbs are preloaded in batch via the ElementTreePreloader's call to Picture.alchemy_element_preloads.
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LGTM. I only would like to know why we need DBQueryMatchers?
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why do we need this gem?
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What is this pull request for?
Introduce a new service that preloads element trees efficiently,
eliminating N+1 queries for nested elements at any depth.
Add
alchemy_element_preloadshook toRelatableResourceconcern.Batch load picture thumbnails in Picture
This eliminates N+1 queries when loading picture thumbnails in the
element editor. The generic preloading mechanism allows any related
object to define custom preloading by implementing
alchemy_element_preloads.Checklist