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discourse/app/models/category.rb

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require_dependency 'distributed_cache'
class Category < ActiveRecord::Base
include Positionable
include HasCustomFields
include CategoryHashtag
include AnonCacheInvalidator
belongs_to :topic, dependent: :destroy
belongs_to :topic_only_relative_url,
-> { select "id, title, slug" },
class_name: "Topic",
foreign_key: "topic_id"
belongs_to :user
belongs_to :latest_post, class_name: "Post"
belongs_to :uploaded_logo, class_name: "Upload"
belongs_to :uploaded_background, class_name: "Upload"
has_many :topics
has_many :category_users
has_many :category_featured_topics
has_many :featured_topics, through: :category_featured_topics, source: :topic
has_many :category_featured_users
has_many :featured_users, through: :category_featured_users, source: :user
has_many :category_groups, dependent: :destroy
has_many :groups, through: :category_groups
has_and_belongs_to_many :web_hooks
validates :user_id, presence: true
validates :name, if: Proc.new { |c| c.new_record? || c.name_changed? },
presence: true,
uniqueness: { scope: :parent_category_id, case_sensitive: false },
length: { in: 1..50 }
validates :num_featured_topics, numericality: { only_integer: true, greater_than: 0 }
validate :parent_category_validator
validate :email_in_validator
validate :ensure_slug
after_create :create_category_definition
before_save :apply_permissions
before_save :downcase_email
before_save :downcase_name
after_save :publish_discourse_stylesheet
after_save :publish_category
after_save :reset_topic_ids_cache
after_save :clear_url_cache
after_save :index_search
after_destroy :reset_topic_ids_cache
after_destroy :publish_category_deletion
after_create :delete_category_permalink
after_update :rename_category_definition, if: :name_changed?
after_update :create_category_permalink, if: :slug_changed?
has_one :category_search_data
belongs_to :parent_category, class_name: 'Category'
has_many :subcategories, class_name: 'Category', foreign_key: 'parent_category_id'
has_many :category_tags, dependent: :destroy
has_many :tags, through: :category_tags
has_many :category_tag_groups, dependent: :destroy
has_many :tag_groups, through: :category_tag_groups
scope :latest, -> { order('topic_count DESC') }
scope :secured, -> (guardian = nil) {
ids = guardian.secure_category_ids if guardian
if ids.present?
where("NOT categories.read_restricted OR categories.id IN (:cats)", cats: ids).references(:categories)
else
where("NOT categories.read_restricted").references(:categories)
end
}
TOPIC_CREATION_PERMISSIONS ||= [:full]
POST_CREATION_PERMISSIONS ||= [:create_post, :full]
scope :topic_create_allowed, -> (guardian) { scoped_to_permissions(guardian, TOPIC_CREATION_PERMISSIONS) }
scope :post_create_allowed, -> (guardian) { scoped_to_permissions(guardian, POST_CREATION_PERMISSIONS) }
delegate :post_template, to: 'self.class'
# permission is just used by serialization
# we may consider wrapping this in another spot
attr_accessor :displayable_topics, :permission, :subcategory_ids, :notification_level, :has_children
@topic_id_cache = DistributedCache.new('category_topic_ids')
def self.topic_ids
@topic_id_cache['ids'] || reset_topic_ids_cache
end
def self.reset_topic_ids_cache
@topic_id_cache['ids'] = Set.new(Category.pluck(:topic_id).compact)
end
def reset_topic_ids_cache
Category.reset_topic_ids_cache
end
def self.last_updated_at
order('updated_at desc').limit(1).pluck(:updated_at).first.to_i
end
def self.scoped_to_permissions(guardian, permission_types)
if guardian.try(:is_admin?)
all
elsif !guardian || guardian.anonymous?
if permission_types.include?(:readonly)
where("NOT categories.read_restricted")
else
where("1 = 0")
end
else
permissions = permission_types.map { |p| CategoryGroup.permission_types[p] }
where("(:staged AND LENGTH(COALESCE(email_in, '')) > 0 AND email_in_allow_strangers)
OR categories.id NOT IN (SELECT category_id FROM category_groups)
OR categories.id IN (
SELECT category_id
FROM category_groups
WHERE permission_type IN (:permissions)
AND (group_id = :everyone OR group_id IN (SELECT group_id FROM group_users WHERE user_id = :user_id))
)",
staged: guardian.is_staged?,
permissions: permissions,
user_id: guardian.user.id,
everyone: Group[:everyone].id)
end
end
def self.update_stats
topics_with_post_count = Topic
.select("topics.category_id, COUNT(*) topic_count, SUM(topics.posts_count) post_count")
.where("topics.id NOT IN (select cc.topic_id from categories cc WHERE topic_id IS NOT NULL)")
.group("topics.category_id")
.visible.to_sql
Category.exec_sql <<-SQL
UPDATE categories c
SET topic_count = x.topic_count,
post_count = x.post_count
FROM (#{topics_with_post_count}) x
WHERE x.category_id = c.id
AND (c.topic_count <> x.topic_count OR c.post_count <> x.post_count)
SQL
# Yes, there are a lot of queries happening below.
# Performing a lot of queries is actually faster than using one big update
# statement with sub-selects on large databases with many categories,
# topics, and posts.
#
# The old method with the one query is here:
# https://github.com/discourse/discourse/blob/5f34a621b5416a53a2e79a145e927fca7d5471e8/app/models/category.rb
#
# If you refactor this, test performance on a large database.
Category.all.each do |c|
topics = c.topics.visible
topics = topics.where(['topics.id <> ?', c.topic_id]) if c.topic_id
c.topics_year = topics.created_since(1.year.ago).count
c.topics_month = topics.created_since(1.month.ago).count
c.topics_week = topics.created_since(1.week.ago).count
c.topics_day = topics.created_since(1.day.ago).count
posts = c.visible_posts
c.posts_year = posts.created_since(1.year.ago).count
c.posts_month = posts.created_since(1.month.ago).count
c.posts_week = posts.created_since(1.week.ago).count
c.posts_day = posts.created_since(1.day.ago).count
c.save if c.changed?
end
end
def visible_posts
query = Post.joins(:topic)
.where(['topics.category_id = ?', self.id])
.where('topics.visible = true')
.where('posts.deleted_at IS NULL')
.where('posts.user_deleted = false')
self.topic_id ? query.where(['topics.id <> ?', self.topic_id]) : query
end
# Internal: Generate the text of post prompting to enter category description.
def self.post_template
I18n.t("category.post_template", replace_paragraph: I18n.t("category.replace_paragraph"))
end
def create_category_definition
t = Topic.new(title: I18n.t("category.topic_prefix", category: name), user: user, pinned_at: Time.now, category_id: id)
t.skip_callbacks = true
t.ignore_category_auto_close = true
t.set_or_create_timer(TopicTimer.types[:close], nil)
t.save!(validate: false)
update_column(:topic_id, t.id)
t.posts.create(raw: post_template, user: user)
end
def topic_url
if has_attribute?("topic_slug")
Topic.relative_url(topic_id, read_attribute(:topic_slug))
else
topic_only_relative_url.try(:relative_url)
end
end
def description_text
return nil unless self.description
@@cache ||= LruRedux::ThreadSafeCache.new(1000)
@@cache.getset(self.description) do
Nokogiri::HTML.fragment(self.description).text.strip
end
end
def duplicate_slug?
Category.where(slug: self.slug, parent_category_id: parent_category_id).where.not(id: id).any?
end
def ensure_slug
return unless name.present?
self.name.strip!
if slug.present?
# santized custom slug
self.slug = Slug.sanitize(slug)
errors.add(:slug, 'is already in use') if duplicate_slug?
else
# auto slug
self.slug = Slug.for(name, '')
self.slug = '' if duplicate_slug?
end
# only allow to use category itself id. new_record doesn't have a id.
unless new_record?
match_id = /^(\d+)-category/.match(self.slug)
errors.add(:slug, :invalid) if match_id && match_id[1] && match_id[1] != self.id.to_s
end
end
def slug_for_url
slug.present? ? self.slug : "#{self.id}-category"
end
def publish_category
group_ids = self.groups.pluck(:id) if self.read_restricted
MessageBus.publish('/categories', {categories: ActiveModel::ArraySerializer.new([self]).as_json}, group_ids: group_ids)
end
def publish_category_deletion
MessageBus.publish('/categories', {deleted_categories: [self.id]})
end
def parent_category_validator
if parent_category_id
errors.add(:base, I18n.t("category.errors.self_parent")) if parent_category_id == id
errors.add(:base, I18n.t("category.errors.uncategorized_parent")) if uncategorized?
grandfather_id = Category.where(id: parent_category_id).pluck(:parent_category_id).first
errors.add(:base, I18n.t("category.errors.depth")) if grandfather_id
end
end
def group_names=(names)
# this line bothers me, destroying in AR can not seem to be queued, thinking of extending it
category_groups.destroy_all unless new_record?
ids = Group.where(name: names.split(",")).pluck(:id)
ids.each do |id|
category_groups.build(group_id: id)
end
end
# will reset permission on a topic to a particular
# set.
#
# Available permissions are, :full, :create_post, :readonly
# hash can be:
#
# :everyone => :full - everyone has everything
# :everyone => :readonly, :staff => :full
# 7 => 1 # you can pass a group_id and permission id
def set_permissions(permissions)
self.read_restricted, @permissions = Category.resolve_permissions(permissions)
# Ideally we can just call .clear here, but it runs SQL, we only want to run it
# on save.
end
def permissions=(permissions)
set_permissions(permissions)
end
def permissions_params
hash = {}
category_groups.includes(:group).each do |category_group|
hash[category_group.group_name] = category_group.permission_type
end
hash
end
def apply_permissions
if @permissions
category_groups.destroy_all
@permissions.each do |group_id, permission_type|
category_groups.build(group_id: group_id, permission_type: permission_type)
end
@permissions = nil
end
end
def allowed_tags=(tag_names_arg)
DiscourseTagging.add_or_create_tags_by_name(self, tag_names_arg, {unlimited: true})
end
def allowed_tag_groups=(group_names)
self.tag_groups = TagGroup.where(name: group_names).all.to_a
end
def downcase_email
self.email_in = (email_in || "").strip.downcase.presence
end
def email_in_validator
return if self.email_in.blank?
email_in.split("|").each do |email|
escaped = Rack::Utils.escape_html(email)
if !Email.is_valid?(email)
self.errors.add(:base, I18n.t('category.errors.invalid_email_in', email: escaped))
elsif group = Group.find_by_email(email)
self.errors.add(:base, I18n.t('category.errors.email_already_used_in_group', email: escaped, group_name: Rack::Utils.escape_html(group.name)))
elsif category = Category.where.not(id: self.id).find_by_email(email)
self.errors.add(:base, I18n.t('category.errors.email_already_used_in_category', email: escaped, category_name: Rack::Utils.escape_html(category.name)))
end
end
end
def downcase_name
self.name_lower = name.downcase if self.name
end
def secure_group_ids
if self.read_restricted?
groups.pluck("groups.id")
end
end
def update_latest
latest_post_id = Post
.order("posts.created_at desc")
.where("NOT hidden")
.joins("join topics on topics.id = topic_id")
.where("topics.category_id = :id", id: self.id)
.limit(1)
.pluck("posts.id")
.first
latest_topic_id = Topic
.order("topics.created_at desc")
.where("visible")
.where("topics.category_id = :id", id: self.id)
.limit(1)
.pluck("topics.id")
.first
self.update_attributes(latest_topic_id: latest_topic_id, latest_post_id: latest_post_id)
end
def self.resolve_permissions(permissions)
read_restricted = true
everyone = Group::AUTO_GROUPS[:everyone]
full = CategoryGroup.permission_types[:full]
mapped = permissions.map do |group,permission|
group = group.id if group.is_a?(Group)
# subtle, using Group[] ensures the group exists in the DB
group = Group[group.to_sym].id unless group.is_a?(Integer)
permission = CategoryGroup.permission_types[permission] unless permission.is_a?(Integer)
[group, permission]
end
mapped.each do |group, permission|
if group == everyone && permission == full
return [false, []]
end
read_restricted = false if group == everyone
end
[read_restricted, mapped]
end
def self.query_parent_category(parent_slug)
self.where(slug: parent_slug, parent_category_id: nil).pluck(:id).first ||
self.where(id: parent_slug.to_i).pluck(:id).first
end
def self.query_category(slug_or_id, parent_category_id)
self.where(slug: slug_or_id, parent_category_id: parent_category_id).includes(:featured_users).first ||
self.where(id: slug_or_id.to_i, parent_category_id: parent_category_id).includes(:featured_users).first
end
def self.find_by_email(email)
self.where("string_to_array(email_in, '|') @> ARRAY[?]", Email.downcase(email)).first
end
def has_children?
@has_children ||= (id && Category.where(parent_category_id: id).exists?) ? :true : :false
@has_children == :true
end
def uncategorized?
id == SiteSetting.uncategorized_category_id
end
@@url_cache = DistributedCache.new('category_url')
def clear_url_cache
@@url_cache.clear
end
def full_slug(separator = "-")
url[3..-1].gsub("/", separator)
end
def url
url = @@url_cache[self.id]
unless url
url = "#{Discourse.base_uri}/c"
url << "/#{parent_category.slug}" if parent_category_id
url << "/#{slug}"
url.freeze
@@url_cache[self.id] = url
end
url
end
def url_with_id
self.parent_category ? "#{url}/#{self.id}" : "#{Discourse.base_uri}/c/#{self.id}-#{self.slug}"
end
# If the name changes, try and update the category definition topic too if it's
# an exact match
def rename_category_definition
old_name = changed_attributes["name"]
return unless topic.present?
if topic.title == I18n.t("category.topic_prefix", category: old_name)
topic.update_attribute(:title, I18n.t("category.topic_prefix", category: name))
end
end
def create_category_permalink
old_slug = changed_attributes["slug"]
if self.parent_category
url = "c/#{self.parent_category.slug}/#{old_slug}"
else
url = "c/#{old_slug}"
end
if Permalink.where(url: url).exists?
Permalink.where(url: url).update_all(category_id: id)
else
Permalink.create(url: url, category_id: id)
end
end
def delete_category_permalink
if self.parent_category
permalink = Permalink.find_by_url("c/#{self.parent_category.slug}/#{slug}")
else
permalink = Permalink.find_by_url("c/#{slug}")
end
permalink.destroy if permalink
end
def publish_discourse_stylesheet
Stylesheet::Manager.cache.clear
end
def index_search
SearchIndexer.index(self)
end
def self.find_by_slug(category_slug, parent_category_slug=nil)
if parent_category_slug
parent_category_id = self.where(slug: parent_category_slug, parent_category_id: nil).pluck(:id).first
self.where(slug: category_slug, parent_category_id: parent_category_id).first
else
self.where(slug: category_slug, parent_category_id: nil).first
end
end
def subcategory_list_includes_topics?
subcategory_list_style.end_with?("with_featured_topics")
end
end
# == Schema Information
#
# Table name: categories
#
# id :integer not null, primary key
# name :string(50) not null
# color :string(6) default("AB9364"), not null
# topic_id :integer
# topic_count :integer default(0), not null
# created_at :datetime not null
# updated_at :datetime not null
# user_id :integer not null
# topics_year :integer default(0)
# topics_month :integer default(0)
# topics_week :integer default(0)
# slug :string not null
# description :text
# text_color :string(6) default("FFFFFF"), not null
# read_restricted :boolean default(FALSE), not null
# auto_close_hours :float
# post_count :integer default(0), not null
# latest_post_id :integer
# latest_topic_id :integer
# position :integer
# parent_category_id :integer
# posts_year :integer default(0)
# posts_month :integer default(0)
# posts_week :integer default(0)
# email_in :string
# email_in_allow_strangers :boolean default(FALSE)
# topics_day :integer default(0)
# posts_day :integer default(0)
# allow_badges :boolean default(TRUE), not null
# name_lower :string(50) not null
# auto_close_based_on_last_post :boolean default(FALSE)
# topic_template :text
# suppress_from_homepage :boolean default(FALSE)
# contains_messages :boolean
# sort_order :string
# sort_ascending :boolean
# uploaded_logo_id :integer
# uploaded_background_id :integer
# topic_featured_link_allowed :boolean default(TRUE)
# all_topics_wiki :boolean default(FALSE), not null
# show_subcategory_list :boolean default(FALSE)
# num_featured_topics :integer default(3)
# default_view :string(50)
# subcategory_list_style :string(50) default("rows_with_featured_topics")
# default_top_period :string(20) default("all")
#
# Indexes
#
# index_categories_on_email_in (email_in) UNIQUE
# index_categories_on_topic_count (topic_count)
# unique_index_categories_on_name (name) UNIQUE
#
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