MongoDB Update Operators

There are many update operators that can be used during document updates.

Fields

The following operators can be used to update fields:

• $currentDate: Sets the field value to the current date
• $inc: Increments the field value
• $rename: Renames the field
• $set: Sets the value of a field
• $unset: Removes the field from the document

Array

The following operators assist with updating arrays.

• $addToSet: Adds distinct elements to an array
• $pop: Removes the first or last element of an array
• $pull: Removes all elements from an array that match the query
• $push: Adds an element to an array