bbe748bd2b
Factor out most of the tag edit logic from the Post class to a new PostEdit class. The PostEdit class contains the logic for parsing tags and metatags from the tag edit string, and for determining which tags were added or removed by the edit. Fixes various bugs caused by not calculating the set of added or removed tags correctly, for example when tag category prefixes were used (e.g. `copy:touhou`) or when the same tag was added and removed in the same edit (e.g. `touhou -touhou`). Fixes #5123: Tag categorization prefixes bypass deprecation check Fixes #5126: Negating a deprecated tag will still cause the warning to show Fixes #3477: Remove tag validator triggering on tag category changes Fixes #4848: newpool: metatag doesn't parse correctly
Logical
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.