Fix metatags not showing autocomplete results until after the first
letter was typed. For example, typing `filetype:` didn't show any
completions until another letter was typed. Now typing `filetype:` shows
all available file types.
This was because `filetype:` by itself wasn't recognized as a valid
search before, since metatags always required a value. Now it is a valid
search, so it's technically possible to search for `filetype:` by
itself. In this case the metatag value will be the empty string, which
will return no results because there are no posts where the filetype is
the empty string.
This sounds nonsensical, but it's potentially useful for metatags like
the `source:` metatag, where searching for posts with an empty source
does make sense. It was also technically possible before by searching
for `source:""`, so making the value optional doesn't change anything.
This directory contains library code used through Danbooru. This includes things like defining API clients, dealing with
sources, parsing tag searches, storing and resizing images, and so on.
Many of the files here use the Service Object pattern. Instead of putting complex code in models or controllers, it goes
here, in plain old Ruby objects (POROs). This keeps models and controllers simpler, and keeps domain logic isolated and
independent from the database and the HTTP request cycle.
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