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| class House | |
| has_many :photos | |
| end |
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| class Photo < ActiveRecord::Base | |
| belongs_to :house | |
| trigger.after(:insert) do | |
| <<-SQL | |
| IF NEW.cover != 't' THEN | |
| IF (SELECT COUNT(*) FROM photos WHERE photos.house_id = NEW.house_id) = 0 THEN | |
| UPDATE photos | |
| SET cover = 't' | |
| WHERE photos.id = NEW.id; | |
| ELSE | |
| UPDATE photos | |
| SET cover = 'f' | |
| WHERE | |
| photos.house_id = NEW.house_id | |
| AND photos.id <> NEW.id; | |
| END IF; | |
| END IF; | |
| SQL | |
| end | |
| trigger.after(:update).of(:cover) do | |
| <<-SQL | |
| IF NEW.cover = 't' THEN | |
| UPDATE photos | |
| SET cover = 'f' | |
| WHERE | |
| photos.house_id = NEW.house_id | |
| AND photos.id <> NEW.id; | |
| END IF; | |
| SQL | |
| end | |
| trigger.after(:delete) do | |
| <<-SQL | |
| IF OLD.cover = 't' THEN | |
| UPDATE photos | |
| SET cover = 't' | |
| WHERE photos.id = ( | |
| SELECT photos.id | |
| FROM photos | |
| WHERE photos.house_id = OLD.house_id | |
| ORDER BY created_at DESC | |
| LIMIT 1 | |
| ); | |
| END IF; | |
| SQL | |
| end | |
| end |
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