FAQ: CRUD II: Deleting Documents - Review

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This community-built FAQ covers the “Review” exercise from the lesson “CRUD II: Deleting Documents”.

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[text9062315027]

Here are my solutions to the “Optional Tasks”.

1.Delete any restaurants that have received a "C" grade via the grades field. After all, we have to keep our standards high!

See documents with a C grade in the grades field:
db.listingsAndReviews.find({"grades.grade": "C"})

Delete all documents with a C grade in the grades field:
db.listingsAndReviews.deleteMany({"grades.grade": "C"})

See result: db.listingsAndReviews.find({"grades.grade": "C"})

2.Replace the cuisine of a restaurant of your choosing.

My guess is that they want us to use the replaceOne() method. So for example like this:

db.listingsAndReviews.replaceOne({ name: "Cafe Bar"},{ name: "Cafe Bar", cuisine: "American" })

This will replace the first found document with the name “Cafe Bar” and replace it with a new document with the fields: “Cafe Bar” and cuisine: “American” })

I found that the updateOne() method is better:
db.listingsAndReviews.updateOne({ "name": "Wakamba"}, { $set : {cuisine: "Mexican"}} )

See result : db.listingsAndReviews.find({ "name": "Wakamba"})

This will not replace the document but just change the cuisine to “American” for the restaurant name “Wakamba”.

3.Choose a restaurant with multiple grades of "A". Replace the document, so it no longer has a grades field but instead has a field named top_restaurant with the value of true.

“Cafe Bar” has several grades of “A”:
db.listingsAndReviews.find({name: "Cafe Bar"})

Again, what they probably want us to do is to use the replaceOne() method:
db.listingsAndReviews.replaceOne( { name: "Cafe Bar" }, { name: "Cafe Bar", top_restaurant: “true” } );

This will replace the document with the name “Cafe Bar” and create a new document with a field called name and the value “Cafe Bar” plus another new field “top_restaurant” and the value “true”.

But for me the updateOne() method would have made sense here as it would not delete all the other fields.