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Warn that TRUNCATEing many tables with Postgres can become slow #202

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Jun 28, 2020
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Warn that TRUNCATEing many tables with Postgres can become slow #202

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4 changes: 4 additions & 0 deletions test/TestImport.hs
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Expand Up @@ -52,6 +52,10 @@ wipeDB app = runDBWithApp app $ do
tables <- getTables
sqlBackend <- ask

-- TRUNCATEing all tables is the simplest approach to wiping the database.
-- Should your application grow to hundreds of tables and tests,
-- switching to DELETE could be a substantial speedup.
-- See: https://github.com/yesodweb/yesod-scaffold/issues/201
let escapedTables = map (connEscapeName sqlBackend . DBName) tables
query = "TRUNCATE TABLE " ++ intercalate ", " escapedTables
rawExecute query []
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