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implications: refactor calculation of implied tags.

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Refactor to use a recursive CTE to calculate implied tags in SQL, rather
than storing them in a descendant_names field. This avoids the
complexity of keeping the stored field up to date. It's also more
flexible, since it allows us to find both descendant tags (tags that
imply a given tag) as well as ancestor tags (tags that are implied by a
given tag).
This commit is contained in:
evazion
2020-02-22 22:12:49 -06:00
parent 83a3ed85dd
commit a8e5412d9c
7 changed files with 66 additions and 135 deletions
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app/models/post.rb
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@@ -643,7 +643,7 @@ class Post < ApplicationRecord
normalized_tags = remove_invalid_tags(normalized_tags)
normalized_tags = Tag.convert_cosplay_tags(normalized_tags)
normalized_tags += Tag.create_for_list(TagImplication.automatic_tags_for(normalized_tags))
normalized_tags = TagImplication.with_descendants(normalized_tags)
normalized_tags += TagImplication.tags_implied_by(normalized_tags).map(&:name)
normalized_tags = normalized_tags.compact.uniq.sort
normalized_tags = Tag.create_for_list(normalized_tags)
set_tag_string(normalized_tags.join(" "))