From b880660b983f98519abbb43f59a05726c78bccf3 Mon Sep 17 00:00:00 2001
From: JoblersTune <sarah38186@gmail.com>
Date: Mon, 23 Oct 2023 14:52:14 +0200
Subject: [PATCH] feat: add option to paginate in desc order

---
 packages/backend/src/fee/service.ts      |  4 +++-
 packages/backend/src/shared/baseModel.ts | 23 ++++++++++++-----------
 packages/backend/src/webhook/service.ts  |  2 +-
 3 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/packages/backend/src/fee/service.ts b/packages/backend/src/fee/service.ts
index 89b147817b..72023cf56d 100644
--- a/packages/backend/src/fee/service.ts
+++ b/packages/backend/src/fee/service.ts
@@ -45,7 +45,9 @@ async function getFeesPage(
   assetId: string,
   pagination?: Pagination
 ): Promise<Fee[]> {
-  const query = Fee.query(deps.knex).where({ assetId }).getPage(pagination)
+  const query = Fee.query(deps.knex)
+    .where({ assetId })
+    .getPage(pagination, 'desc')
 
   return await query
 }
diff --git a/packages/backend/src/shared/baseModel.ts b/packages/backend/src/shared/baseModel.ts
index 75ff2fcca3..81a5c95184 100644
--- a/packages/backend/src/shared/baseModel.ts
+++ b/packages/backend/src/shared/baseModel.ts
@@ -45,7 +45,7 @@ class PaginationQueryBuilder<M extends Model, R = M[]> extends QueryBuilder<
    * @param pagination Pagination - cursors and limits.
    * @returns Model[] An array of Models that form a page.
    */
-  getPage(pagination?: Pagination): this {
+  getPage(pagination?: Pagination, sortOrder: 'asc' | 'desc' = 'asc'): this {
     const tableName = this.modelClass().tableName
     if (
       typeof pagination?.before === 'undefined' &&
@@ -57,33 +57,34 @@ class PaginationQueryBuilder<M extends Model, R = M[]> extends QueryBuilder<
     if (first < 0 || first > 100) throw new Error('Pagination index error')
     const last = pagination?.last || 20
     if (last < 0 || last > 100) throw new Error('Pagination index error')
-
     /**
      * Forward pagination
      */
     if (typeof pagination?.after === 'string') {
+      const comparisonOperator = sortOrder === 'asc' ? '>' : '<'
       return this.whereRaw(
-        `("${tableName}"."createdAt", "${tableName}"."id") > (select "${tableName}"."createdAt" :: TIMESTAMP, "${tableName}"."id" from ?? where "${tableName}"."id" = ?)`,
+        `("${tableName}"."createdAt", "${tableName}"."id") ${comparisonOperator} (select "${tableName}"."createdAt" :: TIMESTAMP, "${tableName}"."id" from ?? where "${tableName}"."id" = ?)`,
         [this.modelClass().tableName, pagination.after]
       )
         .orderBy([
-          { column: 'createdAt', order: 'asc' },
-          { column: 'id', order: 'asc' }
+          { column: 'createdAt', order: sortOrder },
+          { column: 'id', order: sortOrder }
         ])
         .limit(first)
     }
-
     /**
      * Backward pagination
      */
     if (typeof pagination?.before === 'string') {
+      const comparisonOperator = sortOrder === 'asc' ? '<' : '>'
+      const order = sortOrder === 'asc' ? 'desc' : 'asc'
       return this.whereRaw(
-        `("${tableName}"."createdAt", "${tableName}"."id") < (select "${tableName}"."createdAt" :: TIMESTAMP, "${tableName}"."id" from ?? where "${tableName}"."id" = ?)`,
+        `("${tableName}"."createdAt", "${tableName}"."id") ${comparisonOperator} (select "${tableName}"."createdAt" :: TIMESTAMP, "${tableName}"."id" from ?? where "${tableName}"."id" = ?)`,
         [this.modelClass().tableName, pagination.before]
       )
         .orderBy([
-          { column: 'createdAt', order: 'desc' },
-          { column: 'id', order: 'desc' }
+          { column: 'createdAt', order: order },
+          { column: 'id', order: order }
         ])
         .limit(last)
         .runAfter((models) => {
@@ -94,8 +95,8 @@ class PaginationQueryBuilder<M extends Model, R = M[]> extends QueryBuilder<
     }
 
     return this.orderBy([
-      { column: 'createdAt', order: 'asc' },
-      { column: 'id', order: 'asc' }
+      { column: 'createdAt', order: sortOrder },
+      { column: 'id', order: sortOrder }
     ]).limit(first)
   }
 }
diff --git a/packages/backend/src/webhook/service.ts b/packages/backend/src/webhook/service.ts
index f1cf25e525..b858eb9bd8 100644
--- a/packages/backend/src/webhook/service.ts
+++ b/packages/backend/src/webhook/service.ts
@@ -186,5 +186,5 @@ async function getWebhookEventsPage(
     query.whereIn('type', filter.type.in)
   }
 
-  return await query.getPage(pagination)
+  return await query.getPage(pagination, 'desc')
 }