Mongoose cursor-based pagination
npm install mongoose-cursor-pagination --save
The plugin utilises cursor-based pagination via the startingAfter
and endingBefore
parameters.
Both take an existing value (see below) and return objects in reverse chronological order.
The endingBefore
parameter returns objects listed before the named object.
The startingAfter
parameter returns objects listed after the named object.
If both parameters are provided, only endingBefore
is used.
Moreover, an optional limit
parameter can be passed to limit the amount of objects returned.
Add the plugin to a schema:
import mongoose from 'mongoose'
import paginationPlugin from 'mongoose-cursor-pagination'
const AccountSchema = new mongoose.Schema({
username: { type: Number, unique: true, index: true }
})
AccountSchema.plugin(paginationPlugin)
mongoose.model('Account', AccountSchema)
and then use the model paginate method using a promise:
mongoose.model('Account').paginate({}, {
sort: { '_id': 1 },
startingAfter: '59b1f7fd41cfc303859ea1c9',
limit: 20
})
.then(results => { /* ... */ })
.catch(error => { /* ... */ })
or using a callback:
mongoose.model('Account').paginate({}, {
sort: { '_id': 1 }
}, (error, results) => {
/* ... */
})
A possible value for results
is:
{
items: [ /* ... */ ],
hasMore: true
}
where items
is an array containing the elements, and hasMore
is true
if there are more elements available after this set. Or false
otherwise.
The default plugin values can be overwritten, here we show the default values:
AccountSchema.plugin(paginationPlugin, {
key: '_id',
limit: 20,
maxLimit: 100,
minLimit: 1
})
The key
specified is assumed to be unique and should have an index associated.
Moreover, when paginating the key
should be sorted ascending order and the values of startingAfter
and endingBefore
should contained values for that key
.
npm install
npm test