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MongoDB Interview Preparation

Solution: Reading Arrays

We'll cover the following...
Query
db.products.find(
  {
    tags: { $elemMatch: { $regex: /\busb\b/i } }
  },
  {
    name: 1,
    category: 1,
    tags: 1,
    _id: 0
  }
)

The explanation of the query is given below:

  • Line 1: This begins a query on the products collection using the find() method. This tells MongoDB that we want to retrieve documents from the products collection that match certain filter conditions.

  • Line 3: This defines the filter condition for the query.

    • tags: This refers to the array field in each product document.

    • $elemMatch: This checks if any element in the ...