Now, if there are filters present the logic is as follows:
- For multiple filtering values of the same attribute:
the product is visible if there's at least one variation
that has one of the filtering values associated to the attribute,
or if there's at least one variation having the attribute
with a value of "Any".
- For filtering by more than one attribute:
the product is visible if there's at least one variation that
is visible for ALL the attributes according to the above rule.
Note that this is irrespective of the type of logic configured for
the filter (OR or AND).
The layered nav filtering doesn't work well with variable products
when some variations have stock and other don't. When a term is
selected in the widget, a variable product having no stock for
the variation corresponding to that term but having stock for
other variations will be displayed, but it shouldn't.
This commit fixes that by introducing two changes:
- A new override of "is_visible" for WC_Product_Variable that
looks at the supplied filters, compares them against the corresponding
available variations and calculates the visibility based on
the query type (OR or AND).
- A hook on the "found_posts" filter in WC_Query, that adjusts
the posts count based on the found products visibility
when there are filters available; this is needed to sync the
"displaying X posts" messages and the paging when variable
products are hidden due to stock status.
Additionally, the visibility calculated in "found_posts" is cached
as loop variables so that it isn't calculated again when actually
displaying the products.
Claudio Sanches
Nestor Soriano
Christopher Allford