discourse/app/models/category_list.rb

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# frozen_string_literal: true
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class CategoryList
include ActiveModel::Serialization
cattr_accessor :preloaded_topic_custom_fields
self.preloaded_topic_custom_fields = Set.new
attr_accessor :categories,
:uncategorized,
:draft,
:draft_key,
:draft_sequence
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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
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".freeze
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 = {}
category_featured_topics = CategoryFeaturedTopic.select([:category_id, :topic_id]).order(:rank)
@all_topics = Topic.where(id: category_featured_topics.map(&:topic_id))
@all_topics = @all_topics.includes(:last_poster) if @options[:include_topics]
@all_topics.each do |t|
# hint for the serializer
t.include_last_poster = true if @options[:include_topics]
@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
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end
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end
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def find_categories
@categories = Category.includes(
:uploaded_background,
:uploaded_logo,
:topic_only_relative_url,
subcategories: [:topic_only_relative_url]
).secured(@guardian)
@categories = @categories.where("categories.parent_category_id = ?", @options[:parent_category_id].to_i) if @options[:parent_category_id].present?
@categories = self.class.order_categories(@categories)
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@categories = @categories.to_a
notification_levels = CategoryUser.notification_levels_for(@guardian)
default_notification_level = CategoryUser.default_notification_level
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allowed_topic_create = Set.new(Category.topic_create_allowed(@guardian).pluck(:id))
@categories.each do |category|
category.notification_level = notification_levels[category.id] || default_notification_level
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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 @options[:parent_category_id].blank?
subcategories = {}
to_delete = Set.new
@categories.each do |c|
if c.parent_category_id.present?
subcategories[c.parent_category_id] ||= []
subcategories[c.parent_category_id] << c.id
to_delete << c
end
end
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@categories.each { |c| c.subcategory_ids = subcategories[c.id] }
@categories.delete_if { |c| to_delete.include?(c) }
end
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if @topics_by_category_id
@categories.each do |c|
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
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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? && c.displayable_topics.blank? }
end
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# 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] }
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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.each do |c|
next if c.displayable_topics.blank? || c.displayable_topics.size <= c.num_featured_topics
unpinned = []
c.displayable_topics.each do |t|
unpinned << t if t.pinned_at && PinnedCheck.unpinned?(t, t.user_data)
end
unless unpinned.empty?
c.displayable_topics = (c.displayable_topics - unpinned) + unpinned
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end
end
end
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end
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def trim_results
@categories.each do |c|
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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end