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In the about page, we list a certain number of category moderators. This rewrites the SQL query used to retrieve the most recent category moderators in order to perform better with a large number of users/categories/category moderators. TIL: you can ORDER BY inside an ARRAY_AGG in postgres TIL: you can slide ARRAYS in postgres
121 lines
3.2 KiB
Ruby
121 lines
3.2 KiB
Ruby
# frozen_string_literal: true
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class About
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class CategoryMods
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include ActiveModel::Serialization
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attr_reader :category_id, :moderators
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def initialize(category_id, moderators)
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@category_id = category_id
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@moderators = moderators
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end
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end
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include ActiveModel::Serialization
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include StatsCacheable
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attr_accessor :moderators,
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:admins
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def self.stats_cache_key
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'about-stats'
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end
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def self.fetch_stats
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About.new.stats
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end
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def initialize(user = nil)
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@user = user
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end
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def version
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Discourse::VERSION::STRING
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end
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def https
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SiteSetting.force_https
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end
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def title
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SiteSetting.title
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end
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def locale
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SiteSetting.default_locale
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end
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def description
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SiteSetting.site_description
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end
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def moderators
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@moderators ||= User.where(moderator: true, admin: false)
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.human_users
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.order("last_seen_at DESC")
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end
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def admins
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@admins ||= User.where(admin: true)
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.human_users
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.order("last_seen_at DESC")
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end
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def stats
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@stats ||= {
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topic_count: Topic.listable_topics.count,
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post_count: Post.count,
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user_count: User.real.count,
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topics_7_days: Topic.listable_topics.where('created_at > ?', 7.days.ago).count,
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topics_30_days: Topic.listable_topics.where('created_at > ?', 30.days.ago).count,
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posts_7_days: Post.where('created_at > ?', 7.days.ago).count,
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posts_30_days: Post.where('created_at > ?', 30.days.ago).count,
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users_7_days: User.where('created_at > ?', 7.days.ago).count,
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users_30_days: User.where('created_at > ?', 30.days.ago).count,
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active_users_7_days: User.where('last_seen_at > ?', 7.days.ago).count,
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active_users_30_days: User.where('last_seen_at > ?', 30.days.ago).count,
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like_count: UserAction.where(action_type: UserAction::LIKE).count,
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likes_7_days: UserAction.where(action_type: UserAction::LIKE).where("created_at > ?", 7.days.ago).count,
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likes_30_days: UserAction.where(action_type: UserAction::LIKE).where("created_at > ?", 30.days.ago).count
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}
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end
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def category_moderators
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allowed_cats = Guardian.new(@user).allowed_category_ids
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return [] if allowed_cats.blank?
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cats_with_mods = Category.where.not(reviewable_by_group_id: nil).pluck(:id)
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category_ids = cats_with_mods & allowed_cats
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return [] if category_ids.blank?
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per_cat_limit = category_mods_limit / category_ids.size
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per_cat_limit = 1 if per_cat_limit < 1
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results = DB.query(<<~SQL, category_ids: category_ids)
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SELECT c.id category_id
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, (ARRAY_AGG(u.id ORDER BY u.last_seen_at DESC))[:#{per_cat_limit}] user_ids
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FROM categories c
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JOIN group_users gu ON gu.group_id = c.reviewable_by_group_id
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JOIN users u ON u.id = gu.user_id
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WHERE c.id IN (:category_ids)
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GROUP BY c.id
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ORDER BY c.position
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SQL
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moderators = User.where(id: results.map(&:user_ids).flatten.uniq).map { |u| [u.id, u] }.to_h
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results.map do |row|
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CategoryMods.new(row.category_id, row.user_ids.map { |id| moderators[id] })
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end
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end
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def category_mods_limit
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@category_mods_limit || 100
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end
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def category_mods_limit=(number)
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@category_mods_limit = number
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end
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end
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