leaflet.pub
a tool for shared writing and social publishing
add recommend column to documents
awarm.space
+23
supabase/migrations/20260210000000_add_recommend_count.sql
+23
supabase/migrations/20260210000000_add_recommend_count.sql
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ALTER TABLE documents ADD COLUMN recommend_count integer NOT NULL DEFAULT 0;
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UPDATE documents d
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SET recommend_count = (
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SELECT COUNT(*) FROM recommends_on_documents r WHERE r.document = d.uri
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);
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CREATE OR REPLACE FUNCTION update_recommend_count() RETURNS trigger AS $$
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BEGIN
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IF TG_OP = 'INSERT' THEN
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UPDATE documents SET recommend_count = recommend_count + 1
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WHERE uri = NEW.document;
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ELSIF TG_OP = 'DELETE' THEN
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UPDATE documents SET recommend_count = recommend_count - 1
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WHERE uri = OLD.document;
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END IF;
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RETURN NULL;
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END;
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$$ LANGUAGE plpgsql;
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CREATE TRIGGER trg_recommend_count
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AFTER INSERT OR DELETE ON recommends_on_documents
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FOR EACH ROW EXECUTE FUNCTION update_recommend_count();