Class: TopicFeaturedUsers
- Inherits:
-
Object
- Object
- TopicFeaturedUsers
- Defined in:
- app/models/topic_featured_users.rb
Instance Attribute Summary collapse
-
#topic ⇒ Object
readonly
Returns the value of attribute topic.
Class Method Summary collapse
Instance Method Summary collapse
-
#choose(args = {}) ⇒ Object
Chooses which topic users to feature.
-
#initialize(topic) ⇒ TopicFeaturedUsers
constructor
A new instance of TopicFeaturedUsers.
- #user_ids ⇒ Object
Constructor Details
#initialize(topic) ⇒ TopicFeaturedUsers
Returns a new instance of TopicFeaturedUsers.
6 7 8 |
# File 'app/models/topic_featured_users.rb', line 6 def initialize(topic) @topic = topic end |
Instance Attribute Details
#topic ⇒ Object (readonly)
Returns the value of attribute topic.
4 5 6 |
# File 'app/models/topic_featured_users.rb', line 4 def topic @topic end |
Class Method Details
.count ⇒ Object
10 11 12 |
# File 'app/models/topic_featured_users.rb', line 10 def self.count 4 end |
.ensure_consistency!(topic_id = nil) ⇒ Object
29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 |
# File 'app/models/topic_featured_users.rb', line 29 def self.ensure_consistency!(topic_id = nil) filter = "#{"AND t.id = #{topic_id.to_i}" if topic_id}" filter2 = "#{"AND tt.id = #{topic_id.to_i}" if topic_id}" sql = <<SQL WITH cte as ( SELECT t.id, p.user_id, MAX(p.created_at) last_post_date, ROW_NUMBER() OVER(PARTITION BY t.id ORDER BY COUNT(*) DESC, MAX(p.created_at) DESC) as rank FROM topics t JOIN posts p ON p.topic_id = t.id WHERE p.deleted_at IS NULL AND NOT p.hidden AND p.post_type in (#{Topic.visible_post_types.join(",")}) AND p.user_id <> t.user_id AND p.user_id <> t.last_post_user_id #{filter} GROUP BY t.id, p.user_id ), cte2 as ( SELECT id, user_id, ROW_NUMBER() OVER(PARTITION BY id ORDER BY last_post_date ASC) as rank FROM cte WHERE rank <= #{count} ) UPDATE topics tt SET featured_user1_id = x.featured_user1, featured_user2_id = x.featured_user2, featured_user3_id = x.featured_user3, featured_user4_id = x.featured_user4 FROM topics AS tt2 LEFT OUTER JOIN ( SELECT c.id, MAX(case when c.rank = 1 then c.user_id end) featured_user1, MAX(case when c.rank = 2 then c.user_id end) featured_user2, MAX(case when c.rank = 3 then c.user_id end) featured_user3, MAX(case when c.rank = 4 then c.user_id end) featured_user4 FROM cte2 as c GROUP BY c.id ) x ON x.id = tt2.id WHERE tt.id = tt2.id AND ( COALESCE(tt.featured_user1_id,-99) <> COALESCE(x.featured_user1,-99) OR COALESCE(tt.featured_user2_id,-99) <> COALESCE(x.featured_user2,-99) OR COALESCE(tt.featured_user3_id,-99) <> COALESCE(x.featured_user3,-99) OR COALESCE(tt.featured_user4_id,-99) <> COALESCE(x.featured_user4,-99) ) #{filter2} SQL DB.exec(sql) end |
Instance Method Details
#choose(args = {}) ⇒ Object
Chooses which topic users to feature
15 16 17 18 |
# File 'app/models/topic_featured_users.rb', line 15 def choose(args = {}) self.class.ensure_consistency!(topic.id.to_i) update_participant_count end |
#user_ids ⇒ Object
20 21 22 23 24 25 26 27 |
# File 'app/models/topic_featured_users.rb', line 20 def user_ids [ topic.featured_user1_id, topic.featured_user2_id, topic.featured_user3_id, topic.featured_user4_id, ].uniq.compact end |