On this page

• Definition
• Behavior
• Required Access
• Example

Definition

db. grantRolesToRole ( rolename, roles, writeConcern )

Grants roles to a user-defined role.

The grantRolesToRole method uses the following syntax:

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db.grantRolesToRole( "<rolename>", [ <roles> ], { <writeConcern> } )

The grantRolesToRole method takes the following arguments:

Parameter	Type	Description
rolename	string	The name of the role to which to grant sub roles.
roles	array	An array of roles from which to inherit.
writeConcern	document	Optional. The level of write concern for the modification. The writeConcern document takes the same fields as the getLastError command.

In the roles field, you can specify both built-in roles and user-defined roles.

To specify a role that exists in the same database where db.grantRolesToRole() runs, you can either specify the role with the name of the role:

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"readWrite"

Or you can specify the role with a document, as in:

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{ role: "<role>", db: "<database>" }

To specify a role that exists in a different database, specify the role with a document.

The db.grantRolesToRole() method wraps the grantRolesToRole command.

Behavior

Required Access

You must have the grantRole action on a database to grant a role on that database.

Example

The following grantRolesToRole() operation updates the productsReaderWriter role in the products database to inherit the privileges of productsReader role:

use products
db.grantRolesToRole(
    "productsReaderWriter",
    [ "productsReader" ],
    { w: "majority" , wtimeout: 5000 }
)