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https://mongoosejs.com/docs/populate.html
Mongoose v5.11.12: Query Population
Populate MongoDB has the join-like $lookup aggregation operator in versions >= 3.2. Mongoose has a more powerful alternative called populate(), which lets you reference documents in other collections. Population is the process of automatically replacing th
mongoosejs.com
population ๊ณต๋ถ(ํ ๊ฒ)
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