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Index and constrain building_user_likes (one like per building per user)

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This commit is contained in:
Tom Russell 2018-09-30 19:49:41 +01:00
parent e3c02612cd
commit ae17f6db14
1 changed files with 8 additions and 1 deletions
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9
migrations/004.location-date-size-like.up.sql
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@ -70,9 +70,16 @@ ALTER TABLE buildings ADD COLUMN IF NOT EXISTS size_width_frontage real;
-- Likes -- Likes
-- Total likes (denormalised from up-to-one-vote-per-user) -- Total likes (denormalised from up-to-one-vote-per-user)
ALTER TABLE buildings ADD COLUMN IF NOT EXISTS likes_total integer; ALTER TABLE buildings ADD COLUMN IF NOT EXISTS likes_total integer DEFAULT 0;
-- Store users-buildings likes (many-to-many)
CREATE TABLE IF NOT EXISTS building_user_likes ( CREATE TABLE IF NOT EXISTS building_user_likes (
building_like_id serial PRIMARY KEY,
building_id integer REFERENCES buildings, building_id integer REFERENCES buildings,
user_id uuid REFERENCES users user_id uuid REFERENCES users
); );
CREATE INDEX building_likes_idx ON building_user_likes ( building_id );
CREATE INDEX user_likes_idx ON building_user_likes ( user_id );
-- One like per-building, per-user
ALTER TABLE building_user_likes ADD CONSTRAINT building_like_once UNIQUE (building_id, user_id);