Merge pull request #701 from input-output-hk/erikd/PoolMetadataRef-un…

…ique

schema: Fix the uniqueness constraint on PoolMetadataRef

cardano-db/src/Cardano/Db/Schema.hs

@@ -195,7 +195,7 @@ share
     url                 Text
     hash                ByteString          sqltype=hash32type
     registeredTxId      TxId                OnDeleteCascade     -- Only used for rollback.
-    UniquePoolMetadataRef poolId hash
+    UniquePoolMetadataRef poolId url hash
 
   PoolUpdate
     hashId              PoolHashId          OnDeleteCascade

schema/migration-2-0011-20210719.sql

@@ -0,0 +1,20 @@
+-- Persistent generated migration.
+
+CREATE FUNCTION migrate() RETURNS void AS $$
+DECLARE
+  next_version int ;
+BEGIN
+  SELECT stage_two + 1 INTO next_version FROM schema_version ;
+  IF next_version = 11 THEN
+    EXECUTE 'ALTER TABLE "pool_metadata_ref" DROP CONSTRAINT "unique_pool_metadata_ref"' ;
+    EXECUTE 'ALTER TABLE "pool_metadata_ref" ADD CONSTRAINT "unique_pool_metadata_ref" UNIQUE("pool_id","url","hash")' ;
+    -- Hand written SQL statements can be added here.
+    UPDATE schema_version SET stage_two = next_version ;
+    RAISE NOTICE 'DB has been migrated to stage_two version %', next_version ;
+  END IF ;
+END ;
+$$ LANGUAGE plpgsql ;
+
+SELECT migrate() ;
+
+DROP FUNCTION migrate() ;