Search Block: count results per facet

[avoinea]

In eea.facetednavigation we had a feature that would allow one to enable/disable result count per facet. This is also a major feature of modern search solutions like ElasticSearch or Solr.

Would be great to be able to enable counting per facet within Volto Search Block.

For this we will need:

• New RestAPI endpoint for counting
  • RestAPI endpoint draft: Add facet count endpoint plone.restapi#1637
• Volto integration:
• Enable/Disable counting per facet
• RestAPI calls
• Facet view update to include counts

SOLR API: https://solr.apache.org/guide/8_1/json-facet-api.html#bucketing-facet-example
ES API: https://www.elastic.co/guide/en/app-search/current/facets.html

Plone Classic Faceted Navigation counter implementation:

• https://github.com/eea/eea.facetednavigation/blob/develop/eea/facetednavigation/widgets/widget.py#L345

Faceted navigation example from Plone Classic:

[erral]

cc: @ionlizarazu

[sneridagh]

@avoinea what's the status for this one? It's ok to slate it for 18?

[avoinea]

@sneridagh AFAIK there is no progress on it lately. Thus, I think it's safer to move it to 18.x.
cc @razvanMiu

[davisagli]

@sneridagh This is currently more of a proof-of-concept. It should wait for 18. Ideally, we should improve the API in ZCatalog/plone.app.querystring so that we don't have to duplicate code from them.

[FarooqAlaulddin]

Any updates on this feature? Any advice of how to temporality support it?

[avoinea]

@FarooqAlaulddin There is an open PR on plone.restapi plone/plone.restapi#1637 that has to be refactored and move code upstream directly in ZCatalog and plone.app.querystring as @davisagli suggested 😉

[FarooqAlaulddin]

For anyone looking to add this feature prior to the official releases, you need:

Backend Support:

• Add facet count endpoint plone.restapi#1637
• feat(catalog): add rids parameter to return only the rids of documents zopefoundation/Products.ZCatalog#149
• Add rids parameter used to get only the rids of documents plone.app.querystring#145

Volto:

• feat(search): show facets count and hide facets values that are not meeting the mandatory criterias in search block  #5812