查看现有验证规则
You can view a collection's validation rules to determine what restrictions are imposed on documents and how MongoDB handles invalid documents when they occur.
To view a collection's validation rules, use the
db.getCollectionInfos() method or listCollections
database command.
Both commands return the same information, but the output format differs between each command.
先决条件
To run the examples on this page, create a students collection with
validation rules. For more information, see
指定 JSON schema 验证.
示例： db.getCollectionInfos() Syntax
The following command uses db.getCollectionInfos() to return
the validation rules for the students collection:
db.getCollectionInfos( { name: "students" } )[0].options.validator
The output resembles the following validation object:
{ '$jsonSchema': { bsonType: 'object', required: [ 'name', 'year', 'major', 'address' ], properties: { name: { bsonType: 'string', description: 'must be a string and is required' }, year: { bsonType: 'int', minimum: 2017, maximum: 3017, description: 'must be an integer in [ 2017, 3017 ] and is required' }, gpa: { bsonType: [ 'double' ], description: 'must be a double if the field exists' } } } }
注意
Validation Action and Level Not Included by Default
If validationAction and validationLevel are not explicitly
set, db.getCollectionInfos() does not include those fields
in its output.
示例： listCollections Syntax
The following command uses listCollections to return the
validation rules for the students collection:
db.runCommand ( { listCollections: 1, filter: { name: "students" } } )
The output resembles the following object:
{ cursor: { id: Long("0"), ns: 'test.$cmd.listCollections', firstBatch: [ { name: 'students', type: 'collection', options: { validator: { '$jsonSchema': { bsonType: 'object', required: [ 'name', 'year', 'major', 'address' ], properties: { name: { bsonType: 'string', description: 'must be a string and is required' }, gpa: { bsonType: [ 'double' ], description: 'must be a double if the field exists' } } }, validationAction: 'warn' } }, info: { readOnly: false, uuid: UUID("bf560865-5879-4ec1-b389-f77a03abbc5a") }, idIndex: { v: 2, key: { _id: 1 }, name: '_id_' } } ] }, ok: 1 }