Delete single array object in mongodb uing $unset [duplicate]

Question

https://mongoplayground.net/p/Yv6vkGyrUS-

https://mongoplayground.net/p/vm314GoexjE

[
 {
   "_id": ObjectId("4b253b067525f35f94b60a31"),
  "age": 30,
  "favorite book": [
  "Cat's Cradle",
  "Foundation Trilogy",
  "Ender's Game"
   ],
"location": "Wisconsin",
"name": "joe",
"sex": "male"
}
]

output delete any element with based on condition

"favorite book": [
  "Cat's Cradle",
  "Foundation Trilogy"
   ]

but i want del only array of obj a=[1,2,3] del a[1] now a=[1,3]... favbook=[1,2,3] del favbook[0] , favbook=[2,3] etc.. — suresh
– suresh, Commented Dec 16, 2021 at 6:40

script0 · Accepted Answer · 2021-12-16 06:40:38Z

1

You can use $pull operator

db.collection.update({
    { _id : id },
    { $pull: { "favorite book": "Ender's Game" } }
});

If you want to remove two or more elements from the array "list", you can do that with $pull operator, as well:

db.collection.update({
    { _id : id },
    { $pull: { "favorite book" : { $in : [ "Foundation Trilogy", "Ender's Game"] } } }
});

Please check How do I remove a string from an array in a mongodb document?

answered Dec 16, 2021 at 6:40

script0

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2 Comments

suresh Over a year ago

its possible with unset ?

script0 Over a year ago

Yes. I think. But You will use the index of the element. But, it doesn’t remove the array element. Instead, it sets it to null. Check out mongodbtutorial.org/mongodb-crud/mongodb-remove-field-unset

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