discourse/app/models/category_list.rb

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# frozen_string_literal: true
class CategoryList
include ActiveModel::Serialization
cattr_accessor :preloaded_topic_custom_fields
self.preloaded_topic_custom_fields = Set.new
attr_accessor :categories, :uncategorized
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def self.register_included_association(association)
@included_assocations ||= []
@included_assocations << association if !@included_assocations.include?(association)
end
def self.included_associations
[
:uploaded_background,
:uploaded_logo,
:uploaded_logo_dark,
:topic_only_relative_url,
subcategories: [:topic_only_relative_url],
].concat(@included_assocations || [])
end
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def initialize(guardian = nil, options = {})
@guardian = guardian || Guardian.new
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@options = options
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find_relevant_topics if options[:include_topics]
find_categories
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prune_empty
find_user_data
sort_unpinned
trim_results
demote_muted
if preloaded_topic_custom_fields.present?
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displayable_topics = @categories.map(&:displayable_topics)
displayable_topics.flatten!
displayable_topics.compact!
if displayable_topics.present?
Topic.preload_custom_fields(displayable_topics, preloaded_topic_custom_fields)
end
end
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end
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def preload_key
"categories_list"
end
def self.order_categories(categories)
if SiteSetting.fixed_category_positions
categories.order(:position, :id)
else
allowed_category_ids = categories.pluck(:id) << nil # `nil` is necessary to include categories without any associated topics
categories
.left_outer_joins(:featured_topics)
.where(topics: { category_id: allowed_category_ids })
.group("categories.id")
.order("max(topics.bumped_at) DESC NULLS LAST")
.order("categories.id ASC")
end
end
private
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def find_relevant_topics
@topics_by_id = {}
@topics_by_category_id = {}
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category_featured_topics = CategoryFeaturedTopic.select(%i[category_id topic_id]).order(:rank)
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@all_topics =
Topic.where(id: category_featured_topics.map(&:topic_id)).includes(
:shared_draft,
:category,
{ topic_thumbnails: %i[optimized_image upload] },
)
@all_topics = @all_topics.joins(:tags).where(tags: { name: @options[:tag] }) if @options[
:tag
].present?
if @guardian.authenticated?
@all_topics =
@all_topics.joins(
"LEFT JOIN topic_users tu ON topics.id = tu.topic_id AND tu.user_id = #{@guardian.user.id.to_i}",
).where(
"COALESCE(tu.notification_level,1) > :muted",
muted: TopicUser.notification_levels[:muted],
)
end
@all_topics = TopicQuery.remove_muted_tags(@all_topics, @guardian.user).includes(:last_poster)
@all_topics.each do |t|
# hint for the serializer
t.include_last_poster = true
t.dismissed = dismissed_topic?(t)
@topics_by_id[t.id] = t
end
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category_featured_topics.each do |cft|
@topics_by_category_id[cft.category_id] ||= []
@topics_by_category_id[cft.category_id] << cft.topic_id
end
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end
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def dismissed_topic?(topic)
if @guardian.current_user
@dismissed_topic_users_lookup ||=
DismissedTopicUser.lookup_for(@guardian.current_user, @all_topics)
@dismissed_topic_users_lookup.include?(topic.id)
else
false
end
end
def find_categories
@categories = Category.includes(CategoryList.included_associations).secured(@guardian)
@categories =
@categories.where(
"categories.parent_category_id = ?",
@options[:parent_category_id].to_i,
) if @options[:parent_category_id].present?
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@categories = self.class.order_categories(@categories)
@categories = @categories.to_a
include_subcategories = @options[:include_subcategories] == true
notification_levels = CategoryUser.notification_levels_for(@guardian.user)
default_notification_level = CategoryUser.default_notification_level
if @options[:parent_category_id].blank?
subcategory_ids = {}
subcategory_list = {}
to_delete = Set.new
@categories.each do |c|
if c.parent_category_id.present?
subcategory_ids[c.parent_category_id] ||= []
subcategory_ids[c.parent_category_id] << c.id
if include_subcategories
subcategory_list[c.parent_category_id] ||= []
subcategory_list[c.parent_category_id] << c
end
to_delete << c
end
end
@categories.each do |c|
c.subcategory_ids = subcategory_ids[c.id] || []
c.subcategory_list = subcategory_list[c.id] || [] if include_subcategories
end
@categories.delete_if { |c| to_delete.include?(c) }
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end
allowed_topic_create = Set.new(Category.topic_create_allowed(@guardian).pluck(:id))
categories_with_descendants.each do |category|
category.notification_level = notification_levels[category.id] || default_notification_level
category.permission = CategoryGroup.permission_types[:full] if allowed_topic_create.include?(
category.id,
)
category.has_children = category.subcategories.present?
end
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if @topics_by_category_id
categories_with_descendants.each do |c|
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topics_in_cat = @topics_by_category_id[c.id]
if topics_in_cat.present?
c.displayable_topics = []
topics_in_cat.each do |topic_id|
topic = @topics_by_id[topic_id]
if topic.present? && @guardian.can_see?(topic)
# topic.category is very slow under rails 4.2
topic.association(:category).target = c
c.displayable_topics << topic
end
end
end
end
end
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end
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def prune_empty
return if SiteSetting.allow_uncategorized_topics
@categories.delete_if { |c| c.uncategorized? }
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end
# Attach some data for serialization to each topic
def find_user_data
if @guardian.current_user && @all_topics.present?
topic_lookup = TopicUser.lookup_for(@guardian.current_user, @all_topics)
@all_topics.each { |ft| ft.user_data = topic_lookup[ft.id] }
end
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end
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# Put unpinned topics at the end of the list
def sort_unpinned
if @guardian.current_user && @all_topics.present?
categories_with_descendants.each do |c|
next if c.displayable_topics.blank? || c.displayable_topics.size <= c.num_featured_topics
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unpinned = []
c.displayable_topics.each do |t|
unpinned << t if t.pinned_at && PinnedCheck.unpinned?(t, t.user_data)
end
c.displayable_topics = (c.displayable_topics - unpinned) + unpinned unless unpinned.empty?
end
end
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end
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def demote_muted
muted_categories = @categories.select { |category| category.notification_level == 0 }
@categories = @categories.reject { |category| category.notification_level == 0 }
@categories.concat muted_categories
end
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def trim_results
categories_with_descendants.each do |c|
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next if c.displayable_topics.blank?
c.displayable_topics = c.displayable_topics[0, c.num_featured_topics]
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end
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end
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def categories_with_descendants(categories = @categories)
return @categories_with_children if @categories_with_children && (categories == @categories)
return nil if categories.nil?
result = categories.flat_map { |c| [c, *categories_with_descendants(c.subcategory_list)] }
@categories_with_children = result if categories == @categories
result
end
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end