Here's what's in `IndexableText` right now:
1. Title
2. Collections
3. Authors
4. Tags
5. LocSubjects
6. TocEntries
Here is the proposed new ranking:
```
10 * Title +
8 * Authors +
3 * Collections +
IndexableText
```
New indices for existing DBs:
```
ALTER TABLE `Ebooks` ADD COLUMN `IndexableAuthors` text NOT NULL;
ALTER TABLE `Ebooks` ADD COLUMN `IndexableCollections` text NULL;
ALTER TABLE `Ebooks` ADD FULLTEXT `indexSearchTitle` (`Title`);
ALTER TABLE `Ebooks` ADD FULLTEXT `idxSearchAuthors` (`IndexableAuthors`);
ALTER TABLE `Ebooks` ADD FULLTEXT `idxSearchCollections` (`IndexableCollections`);
```
Searching by `UrlName`, now for both `Artwork` and `Artist`, is clearer.
Take care to remove the apostrophes outright, don't replace them with a
space because otherwise the letter after the apostrophe becomes its own
term to match.
Follow up to the fix for #461
`Artwork::GetAllByFilter()` is already removing diacritics from search
terms, and `UrlName` stores the artist's name with diacritics removed by
calling `Formatter::MakeUrlSafe()`.
Keeping the search by `Name` because `Formatter::MakeUrlSafe()` makes
other changes to the name, too.
Fixes#461
Instead of `USING(EbookId)`, it would be easier to handle
`MultiTableSelect` queries in `FromMultiTableRow()` if the queries used
`ON Projects.EbookId = Ebooks.Ebooks`
This is because `USING` will return only one `EbookId` column, but `ON`
will return all columns from both tables.
On `Ebook::Save()` and `Ebook::Delete()`, remove any unreferenced `Tag`,
`LocSubject`, and `Collection` records. These are analogous to these lines in
`Ebook::Create()`:
```
$this->CreateTags();
$this->CreateLocSubjects();
$this->CreateCollections();
```
`EbookPlaceholder`s can't have `Tags` or `LocSubjects` at the moment, but other
mistakes in production that are later corrected could leave unused `Tags` and
`LocSubjects`.
Context: https://github.com/standardebooks/web/pull/447#issuecomment-2555734692
