Update One

updateOne Method

The method used to update One record in a collection that meets a certain criteria. Mostly the criteria is search by a primary key.

Usage

const updated = await User.updateOne({
  id: "3787778"
}).set({ full_name: "Angela W. K.", password: "zzzzz" });

// Do something with the record;

by default, the .fetch() method is passed. The method returns the updated record in an object format.

Update Operators

The following key words are implemented in the update/updateOne query

Operator	Operation
$inc	Increase or decrease a value
$inc	Increase or decrease a value
$pop	Remove last item of array
$shift	Remove first item of array
$unshift	Add Item in the front of an array
$unshiftset	Add Item in the front of an array if it does not exist ih the array
$push	Add Item at the end of an array
$pushset	Add Item at the end of an array if it does not exist in the array
$pull	Remove items from an array, accepts arrray

$pushset and $unshiftset Example

const comment = await Comment.updatedOne(
  { id: "c234123" },
  { replies: { $pushset: reply }, likes: { $unshiftset: user.id } }
);

The $pushset operator adds a reply to a comment's replies array if it doesn't already exist and also adds the user's id to the list of likes

$pull and $shift Example

const comment = await Comment.updateOne(
  { id: "c234123" },
  { replies: { $pull: [reply1, reply2] }, likes: { $shift: true } }

  //note that \$pull requires that items to pull be an array
);

$pull would would remove the specific replies irrespective of position in the array while $shift would remove the first user ID in the array.