82 lines
2.5 KiB
Ruby
82 lines
2.5 KiB
Ruby
class CategoryFeaturedTopic < ActiveRecord::Base
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belongs_to :category
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belongs_to :topic
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# Populates the category featured topics
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def self.feature_topics
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current = {}
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CategoryFeaturedTopic.select(:topic_id, :category_id).order(:rank).each do |f|
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(current[f.category_id] ||= []) << f.topic_id
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end
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Category.select(:id, :topic_id, :num_featured_topics).find_each do |c|
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CategoryFeaturedTopic.feature_topics_for(c, current[c.id] || [])
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end
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end
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def self.feature_topics_for(c, existing = nil)
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return if c.blank?
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query_opts = {
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per_page: c.num_featured_topics,
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except_topic_ids: [c.topic_id],
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visible: true,
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no_definitions: true
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}
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# It may seem a bit odd that we are running 2 queries here, when admin
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# can clearly pull out all the topics needed.
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# We do so, so anonymous will ALWAYS get some topics
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# If we only fetched as admin we may have a situation where anon can see
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# no featured topics (all the previous 2x topics are only visible to admins)
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# Add topics, even if they're in secured categories or invisible
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query = TopicQuery.new(CategoryFeaturedTopic.fake_admin, query_opts)
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results = query.list_category_topic_ids(c).uniq
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# Add some topics that are visible to everyone:
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anon_query = TopicQuery.new(nil, query_opts.merge(except_topic_ids: [c.topic_id] + results))
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results += anon_query.list_category_topic_ids(c).uniq
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return if results == existing
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CategoryFeaturedTopic.transaction do
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CategoryFeaturedTopic.delete_all(category_id: c.id)
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if results
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results.each_with_index do |topic_id, idx|
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begin
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c.category_featured_topics.create(topic_id: topic_id, rank: idx)
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rescue PG::UniqueViolation
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# If another process features this topic, just ignore it
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end
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end
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end
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end
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end
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def self.fake_admin
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# fake an admin
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admin = User.new
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admin.admin = true
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admin.id = -1
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admin
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end
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end
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# == Schema Information
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#
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# Table name: category_featured_topics
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#
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# category_id :integer not null
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# topic_id :integer not null
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# created_at :datetime not null
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# updated_at :datetime not null
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# rank :integer default(0), not null
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# id :integer not null, primary key
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#
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# Indexes
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#
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# cat_featured_threads (category_id,topic_id) UNIQUE
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# index_category_featured_topics_on_category_id_and_rank (category_id,rank)
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#
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