feat: add order to pagination

packages/analytics/src/models/pagination.js

@@ -3,40 +3,60 @@
 // eslint-disable-next-line max-classes-per-file
 import mongoose from 'mongoose'
 
-class Pagination {
+export const DESC = 'desc'
+export const ASC = 'asc'
+
+class Asc {
+  getOperator() {
+    return '$gt'
+  }
+
+  getOrder() {
+    return 1
+  }
+}
+
+class Desc {
+  getOperator() {
+    return '$lt'
+  }
+
+  getOrder() {
+    return -1
+  }
+}
+
+export default class Pagination {
   nextKey = null
   itemsPerPage = 50
+  order = null
 
-  constructor(itemsPerPage = 50, nextKey = null) {
+  constructor(order, itemsPerPage = 50, nextKey = null) {
     this.itemsPerPage = itemsPerPage
+    if (!order || order === DESC) {
+      this.order = new Desc()
+    } else if (order === ASC) {
+      this.order = new Asc()
+    } else {
+      throw new Error('order must be asc or desc')
+    }
     if (nextKey) {
       this.nextKey = new mongoose.Types.ObjectId(nextKey)
     }
   }
 
+  match(field) {
+    const stage = this.nextKey
+      ? { [field]: { [this.order.getOperator()]: this.nextKey } }
+      : {}
+    return { $match: stage }
+  }
+
+  sort(field) {
+    return { $sort: { [field]: this.order.getOrder() } }
+  }
+
   limit() {
     return { $limit: this.itemsPerPage }
   }
 }
-
-export class Asc extends Pagination {
-  matchStage(field) {
-    const stage = this.nextKey ? { [field]: { $gt: this.nextKey } } : {}
-    return { $match: stage }
-  }
-
-  order(field) {
-    return { $sort: { [field]: 1 } }
-  }
-}
-
-export class Desc extends Pagination {
-  matchStage(field) {
-    const stage = this.nextKey ? { [field]: { $lt: this.nextKey } } : {}
-    return { $match: stage }
-  }
-
-  order(field) {
-    return { $sort: { [field]: -1 } }
-  }
-}