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MongoDB Interview Preparation

Solution: Updating Arrays

We'll cover the following...
Query
db.products.updateMany(
  { price: { $lte: 0 } },
  {
    $set: { 
      price: 49, 
      status: "Inactive" 
    },
    $addToSet: { 
      tags: "needs-review" 
    }
  }
)
, db.products.find({status: "Inactive"})

Explanation

The explanation of the query is given below:

  • Line 1: db.products.updateMany; this command tells MongoDB to update multiple documents inside the products collection that match a given condition.

  • Line 2: It selects all products whose price is less than or equal to zero, meaning they are incorrectly priced or invalid entries. ...