Whenever a loop is requested to use a criteria which does not belong to the loop’s own primary table, SPIP automatically tries to find a linked table which contains the requested field.
SPIP has two methods to find linked tables: either through links that are declared explicitly, or ones that are calculated.
Retrieve the documents which are inserted into the body text of articles or other editorial content (as with a
<docXX> type model), and which are not just linked to that object. The
vu field belongs to the
spip_documents_liens table, so a join is created to that table to obtain the desired result.
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