Getting the Number of EvoGallery Images for Each Resource in DocLister

When a listing needs gallery counts per item, you have to query gallery data by resource rather than rely on generic child counters.

If you are rendering a catalog or portfolio with DocLister and want to display how many EvoGallery images belong to each resource, generic counters such as [+total+] are not enough. They count child documents, not gallery files.

The right direction

Attach the count at the listing layer. That usually means either:

adding a custom prepare function that queries EvoGallery data per resource
joining a precomputed count from a gallery-related table or cache
saving the gallery count into a TV or helper field during gallery updates

The best option depends on scale. For a small portfolio, a lightweight lookup in prepare is fine. For a large catalog, precomputing the count is the safer path.

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