discourse/app/models/category_user.rb

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# frozen_string_literal: true
class CategoryUser < ActiveRecord::Base
belongs_to :category
belongs_to :user
def self.lookup(user, level)
self.where(user: user, notification_level: notification_levels[level])
end
def self.notification_levels
NotificationLevels.all
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end
def self.watching_levels
[notification_levels[:watching], notification_levels[:watching_first_post]]
end
def self.batch_set(user, level, category_ids)
level_num = notification_levels[level]
category_ids = Category.where(id: category_ids).pluck(:id)
changed = false
# Update pre-existing category users
if category_ids.present? && CategoryUser
.where(user_id: user.id, category_id: category_ids)
.where.not(notification_level: level_num)
.update_all(notification_level: level_num) > 0
changed = true
end
# Remove extraneous category users
if CategoryUser.where(user_id: user.id, notification_level: level_num)
.where.not(category_id: category_ids)
.delete_all > 0
changed = true
end
if category_ids.present?
params = {
user_id: user.id,
level_num: level_num,
}
sql = <<~SQL
INSERT INTO category_users (user_id, category_id, notification_level)
SELECT :user_id, :category_id, :level_num
ON CONFLICT DO NOTHING
SQL
# we could use VALUES here but it would introduce a string
# into the query, plus it is a bit of a micro optimisation
category_ids.each do |category_id|
params[:category_id] = category_id
if DB.exec(sql, params) > 0
changed = true
end
end
end
if changed
auto_watch(user_id: user.id)
auto_track(user_id: user.id)
end
changed
end
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def self.set_notification_level_for_category(user, level, category_id)
record = CategoryUser.where(user: user, category_id: category_id).first
return if record && record.notification_level == level
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if record.present?
record.notification_level = level
record.save!
else
begin
CategoryUser.create!(user: user, category_id: category_id, notification_level: level)
rescue ActiveRecord::RecordNotUnique
# does not matter
end
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end
auto_watch(user_id: user.id)
auto_track(user_id: user.id)
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end
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def self.auto_track(opts = {})
builder = DB.build <<~SQL
UPDATE topic_users tu
SET notification_level = :tracking,
notifications_reason_id = :auto_track_category
FROM topics t, category_users cu
/*where*/
SQL
builder.where("tu.topic_id = t.id AND
cu.category_id = t.category_id AND
cu.user_id = tu.user_id AND
cu.notification_level = :tracking AND
tu.notification_level = :regular")
if category_id = opts[:category_id]
builder.where("t.category_id = :category_id", category_id: category_id)
end
if topic_id = opts[:topic_id]
builder.where("tu.topic_id = :topic_id", topic_id: topic_id)
end
if user_id = opts[:user_id]
builder.where("tu.user_id = :user_id", user_id: user_id)
end
builder.exec(
tracking: notification_levels[:tracking],
regular: notification_levels[:regular],
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auto_track_category: TopicUser.notification_reasons[:auto_track_category]
)
end
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def self.auto_watch(opts = {})
builder = DB.build <<~SQL
UPDATE topic_users tu
SET notification_level =
CASE WHEN should_track THEN :tracking
WHEN should_watch THEN :watching
ELSE notification_level
END,
notifications_reason_id =
CASE WHEN should_track THEN null
WHEN should_watch THEN :auto_watch_category
ELSE notifications_reason_id
END
FROM (
SELECT tu1.topic_id,
tu1.user_id,
CASE WHEN
cu.user_id IS NULL AND tu1.notification_level = :watching AND tu1.notifications_reason_id = :auto_watch_category THEN true
ELSE false
END should_track,
CASE WHEN
cu.user_id IS NOT NULL AND tu1.notification_level in (:regular, :tracking) THEN true
ELSE false
END should_watch
FROM topic_users tu1
JOIN topics t ON t.id = tu1.topic_id
LEFT JOIN category_users cu ON cu.category_id = t.category_id AND cu.user_id = tu1.user_id AND cu.notification_level = :watching
/*where2*/
) as X
/*where*/
SQL
builder.where("X.topic_id = tu.topic_id AND X.user_id = tu.user_id")
builder.where("should_watch OR should_track")
if category_id = opts[:category_id]
builder.where2("t.category_id = :category_id", category_id: category_id)
end
if topic_id = opts[:topic_id]
builder.where("tu.topic_id = :topic_id", topic_id: topic_id)
builder.where2("tu1.topic_id = :topic_id", topic_id: topic_id)
end
if user_id = opts[:user_id]
builder.where("tu.user_id = :user_id", user_id: user_id)
builder.where2("tu1.user_id = :user_id", user_id: user_id)
end
builder.exec(
watching: notification_levels[:watching],
tracking: notification_levels[:tracking],
regular: notification_levels[:regular],
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auto_watch_category: TopicUser.notification_reasons[:auto_watch_category]
)
end
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def self.ensure_consistency!
DB.exec <<~SQL
DELETE FROM category_users
WHERE user_id IN (
SELECT cu.user_id FROM category_users cu
LEFT JOIN users u ON u.id = cu.user_id
WHERE u.id IS NULL
)
SQL
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end
end
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# == Schema Information
#
# Table name: category_users
#
# id :integer not null, primary key
# category_id :integer not null
# user_id :integer not null
# notification_level :integer not null
#
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# Indexes
#
# idx_category_users_category_id_user_id (category_id,user_id) UNIQUE
# idx_category_users_user_id_category_id (user_id,category_id) UNIQUE
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#