mongoose報錯:(node:15689) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead.
解決辦法：
//連接數據庫
mongoose.set('useCreateIndex', true) //加上這個
mongoose.connect(db, { useNewUrlParser: true })
mongoose報錯:DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead.
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