In Mongoose, you create a TTL index on a Date
field via the expires
property in the schema definition of that field:
// expire docs 3600 seconds after createdAt
new Schema({ createdAt: { type: Date, expires: 3600 }});
Note that:
- MongoDB's data expiration task runs once a minute, so an expired doc might persist up to a minute past its expiration.
- This feature requires MongoDB 2.2 or later.
- It's up to you to set
createdAt
to the current time when creating docs, or add a default
to do it for you as suggested here.
{ createdAt: { type: Date, expires: 3600, default: Date.now }}
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…