written by Ivan Alenko

published under license Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)copy! share!

posted in category Software Development & Programming / Rails ActiveRecord

posted at 05. Dec '20

Howto Preload acts_as_taggable

model Article
  acts_as_taggable
  acts_as_taggable_on :management
end

These commands avoid n+1 queries:

Article.includes(:tags => :taggings).map{|article| article.tags}

do not use #tags_list or #management_list, but map the tags:

Article.includes(:tags => :taggings).map{|article| article.tags.map(&:name)}

Preload different context on Article class called “management”:

Article.includes(:management => :taggings).map{|article| article.management.map(&:name)}

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