discourse/lib/topic_query.rb

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#
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# Helps us find topics. Returns a TopicList object containing the topics
# found.
#
require_dependency 'topic_list'
class TopicQuery
class << self
# use the constants in conjuction with COALESCE to determine the order with regard to pinned
# topics that have been cleared by the user. There
# might be a cleaner way to do this.
def lowest_date
"2010-01-01"
end
def highest_date
"3000-01-01"
end
# If you've clearned the pin, use bumped_at, otherwise put it at the top
def order_with_pinned_sql
"CASE
WHEN (COALESCE(topics.pinned_at, '#{lowest_date}') > COALESCE(tu.cleared_pinned_at, '#{lowest_date}'))
THEN '#{highest_date}'
ELSE topics.bumped_at
END DESC"
end
def order_hotness
# When anonymous, don't use topic_user
if @user.blank?
return "CASE
WHEN topics.pinned_at IS NOT NULL THEN 100
ELSE hot_topics.score + (COALESCE(categories.hotness, 5.0) / 11.0)
END DESC"
end
# When logged in take into accounts what pins you've closed
"CASE
WHEN (COALESCE(topics.pinned_at, '#{lowest_date}') > COALESCE(tu.cleared_pinned_at, '#{lowest_date}'))
THEN 100
ELSE hot_topics.score + (COALESCE(categories.hotness, 5.0) / 11.0)
END DESC"
end
# If you've clearned the pin, use bumped_at, otherwise put it at the top
def order_nocategory_with_pinned_sql
"CASE
WHEN topics.category_id IS NULL and (COALESCE(topics.pinned_at, '#{lowest_date}') > COALESCE(tu.cleared_pinned_at, '#{lowest_date}'))
THEN '#{highest_date}'
ELSE topics.bumped_at
END DESC"
end
# For anonymous users
def order_nocategory_basic_bumped
"CASE WHEN topics.category_id IS NULL and (topics.pinned_at IS NOT NULL) THEN 0 ELSE 1 END, topics.bumped_at DESC"
end
def order_basic_bumped
"CASE WHEN (topics.pinned_at IS NOT NULL) THEN 0 ELSE 1 END, topics.bumped_at DESC"
end
end
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def initialize(user=nil, opts={})
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@user = user
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# Cast to int to avoid sql injection
@user_id = user.id.to_i if @user.present?
@opts = opts
end
# Return a list of suggested topics for a topic
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def list_suggested_for(topic)
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exclude_topic_ids = [topic.id]
# If not logged in, return some random results, preferably in this category
if @user.blank?
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return TopicList.new(:suggested, @user, random_suggested_results_for(topic, SiteSetting.suggested_topics, exclude_topic_ids))
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end
results = unread_results(per_page: SiteSetting.suggested_topics)
.where('topics.id NOT IN (?)', exclude_topic_ids)
.where(closed: false, archived: false, visible: true)
.all
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results_left = SiteSetting.suggested_topics - results.size
# If we don't have enough results, go to new posts
if results_left > 0
exclude_topic_ids << results.map {|t| t.id}
exclude_topic_ids.flatten!
results << new_results(per_page: results_left)
.where('topics.id NOT IN (?)', exclude_topic_ids)
.where(closed: false, archived: false, visible: true)
.all
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results.flatten!
results_left = SiteSetting.suggested_topics - results.size
# If we STILL don't have enough results, find random topics
if results_left > 0
exclude_topic_ids << results.map {|t| t.id}
exclude_topic_ids.flatten!
results << random_suggested_results_for(topic, results_left, exclude_topic_ids)
.where(closed: false, archived: false, visible: true)
.all
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results.flatten!
end
end
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TopicList.new(:suggested, @user, results)
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end
# The latest view of topics
def list_latest
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create_list(:latest)
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end
# The favorited topics
def list_favorited
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create_list(:favorited) {|topics| topics.where('tu.starred') }
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end
def list_read
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create_list(:read, unordered: true) do |topics|
topics.order('COALESCE(tu.last_visited_at, topics.bumped_at) DESC')
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end
end
def list_hot
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create_list(:hot, unordered: true) do |topics|
topics.joins(:hot_topic).order(TopicQuery.order_hotness)
end
end
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def list_new
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TopicList.new(:new, @user, new_results)
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end
def list_unread
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TopicList.new(:unread, @user, unread_results)
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end
def list_posted
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create_list(:posted) {|l| l.where('tu.user_id IS NOT NULL') }
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end
def list_uncategorized
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create_list(:uncategorized, unordered: true) do |list|
list = list.where(category_id: nil)
if @user_id.present?
list.order(TopicQuery.order_with_pinned_sql)
else
list.order(TopicQuery.order_nocategory_basic_bumped)
end
end
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end
def list_category(category)
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create_list(:category, unordered: true) do |list|
list = list.where(category_id: category.id)
if @user_id.present?
list.order(TopicQuery.order_with_pinned_sql)
else
list.order(TopicQuery.order_basic_bumped)
end
end
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end
def unread_count
unread_results(limit: false).count
end
def new_count
new_results(limit: false).count
end
def list_new_in_category(category)
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create_list(:new_in_category) {|l| l.where(category_id: category.id).by_newest.first(25)}
end
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protected
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def create_list(filter, list_opts={})
topics = default_list(list_opts)
topics = yield(topics) if block_given?
TopicList.new(filter, @user, topics)
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end
# Create a list based on a bunch of detault options
def default_list(list_opts={})
query_opts = @opts.merge(list_opts)
page_size = query_opts[:per_page] || SiteSetting.topics_per_page
# Start with a list of all topics
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result = Topic
if @user_id.present?
result = result.joins("LEFT OUTER JOIN topic_users AS tu ON (topics.id = tu.topic_id AND tu.user_id = #{@user_id})")
end
unless query_opts[:unordered]
# If we're logged in, we have to pay attention to our pinned settings
if @user_id.present?
result = result.order(TopicQuery.order_nocategory_with_pinned_sql)
else
result = result.order(TopicQuery.order_nocategory_basic_bumped)
end
end
result = result.listable_topics.includes(category: :topic_only_relative_url)
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result = result.where('categories.name is null or categories.name <> ?', query_opts[:exclude_category]) if query_opts[:exclude_category]
result = result.where('categories.name = ?', query_opts[:only_category]) if query_opts[:only_category]
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result = result.limit(page_size) unless query_opts[:limit] == false
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result = result.visible if @user.blank? or @user.regular?
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result = result.where('topics.id <> ?', query_opts[:except_topic_id]) if query_opts[:except_topic_id].present?
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result = result.offset(query_opts[:page].to_i * page_size) if query_opts[:page].present?
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result
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end
def new_results(list_opts={})
default_list(list_opts)
.where("topics.created_at >= :created_at", created_at: @user.treat_as_new_topic_start_date)
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.where("tu.last_read_post_number IS NULL")
.where("COALESCE(tu.notification_level, :tracking) >= :tracking", tracking: TopicUser.notification_levels[:tracking])
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end
def unread_results(list_opts={})
default_list(list_opts)
.where("tu.last_read_post_number < topics.highest_post_number")
.where("COALESCE(tu.notification_level, :regular) >= :tracking", regular: TopicUser.notification_levels[:regular], tracking: TopicUser.notification_levels[:tracking])
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end
def random_suggested_results_for(topic, count, exclude_topic_ids)
results = default_list(unordered: true, per_page: count)
.where('topics.id NOT IN (?)', exclude_topic_ids)
.where(closed: false, archived: false, visible: true)
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if topic.category_id.present?
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return results.order("CASE WHEN topics.category_id = #{topic.category_id.to_i} THEN 0 ELSE 1 END, RANDOM()")
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end
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results.order("RANDOM()")
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end
end