deployd/docs/reference/modifiers.md

Update Modifiers

When updating an object in a Collection, you can use special modifier commands to more granularly change property values.

$inc

The $inc command increments the value of a given Number property.

// Give a player 5 points
{
	score: {$inc: 5}
}

$push

The $push command adds a value to an Array property.

// Add a follower to a user by storing their id.
{
	followers: {$push: 'a59551a90be9abd8'}
}

Note: This will work even on an undefined property

$pushAll

The $pushAll command adds multiple values to an Array property.

// Add mentions of users
{
	mentions: {
		$pushAll: ['a59551a90be9abd8', 'd0be45d1445d3809']
	}
}

Note: This will work even on an undefined property

$pull

The $pull command removes a value from an Array property.

// Remove a user from followers
{
	followers: {$pull: 'a59551a90be9abd8'}
}

Note: If there is more than one matching value in the Array, this will remove all of them

$pullAll

The $pullAll command removes multiple values from an Array property.

// Remove multiple users
{
	followers: {$pullAll: ['a59551a90be9abd8', 'd0be45d1445d3809']}
}

Note: This will remove all of matching values from the Array