Fixed the SearchMediaItemsUnified query to properly handle the has_cover
parameter in three states:
- NULL (not specified): Show all books
- TRUE: Show only books with cover images
- FALSE: Show only books without cover images
Changes:
- Added explicit boolean casting (::bool) to sqlc.narg('has_cover')
to resolve PostgreSQL type inference error (SQLSTATE 42P08)
- Replaced single AND condition with OR'd logic to handle all three
states without mutual exclusion
- Used IS NULL check to detect when parameter is not specified
- Used IS TRUE/IS FALSE to explicitly check boolean states
The previous implementation had mutually exclusive AND conditions that
prevented any records from matching when has_cover was explicitly set
to TRUE or FALSE, causing the filter to block all searches.
This fix resolves the issue where searches were returning 0 results
regardless of other filter parameters when has_cover was included in
the query.