From c825c2dd5f3df35def32d7b3d5b5d02ffb27ced9 Mon Sep 17 00:00:00 2001
From: 9w <qwer9w@gmail.com>
Date: Thu, 4 Aug 2022 10:18:47 +0900
Subject: [PATCH 1/2] =?UTF-8?q?feat:=20RelationType=20=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/relation.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/relation.ts b/src/relation.ts
index 0b43661..5ea3764 100644
--- a/src/relation.ts
+++ b/src/relation.ts
@@ -1,14 +1,16 @@
+export type RelationType = 'ONE_TO_MANY';
 export interface Relation {
   table: string;
   column: string;
   fk: string;
   property: string;
+  type?: RelationType;
 }
 
 const defaultFk = (table: string, fk?: string) => fk || `${table}Id`;
 
-export function relation(table: string, column = 'id', fk?: string, property?: string) {
-  return { table, column, fk: fk || defaultFk(table, fk), property: property || table };
+export function relation(table: string, column = 'id', fk?: string, property?: string, type?: RelationType) {
+  return { table, column, fk: fk || defaultFk(table, fk), property: property || table, type };
 }
 
 // ex. `user` === `user.id` === `userId=user.id` === `userId=user.id@user`

From affdcea6693d3950da177c525c113cd96314b89d Mon Sep 17 00:00:00 2001
From: 9w <qwer9w@gmail.com>
Date: Thu, 4 Aug 2022 10:20:17 +0900
Subject: [PATCH 2/2] =?UTF-8?q?feat:=20weave=EC=97=90=20one-to-many?=
 =?UTF-8?q?=EA=B4=80=EA=B3=84=EB=8F=84=20=EB=8F=99=EC=9E=91=ED=95=98?=
 =?UTF-8?q?=EB=8F=84=EB=A1=9D=20=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/weaver.spec.ts | 21 +++++++++++++++++++++
 src/weaver.ts      |  8 ++++++--
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/src/weaver.spec.ts b/src/weaver.spec.ts
index 98f3ef3..71ad881 100644
--- a/src/weaver.spec.ts
+++ b/src/weaver.spec.ts
@@ -41,6 +41,27 @@ describe('weaver', () => {
         expect(post.user).toEqual(await knex('user').where({ id: post.userId }).first());
       }
     });
+    it('should weave one-to-many relationships', async () => {
+      const rr = Weaver.create({ knex, cache });
+      const posts = await knex('post').select();
+      const postsWithRels = await rr.weave(posts, [
+        {
+          table: 'postTag',
+          column: 'postId',
+          fk: 'id',
+          property: 'postTag',
+          type: 'ONE_TO_MANY',
+        },
+      ]);
+      for (const post of postsWithRels) {
+        const relationData = await knex('postTag').where({ postId: post.id });
+        if (relationData.length === 0) {
+          expect(post.postTag).toBeUndefined();
+        } else {
+          expect(post.postTag).toMatchObject(relationData);
+        }
+      }
+    });
     it('should weave nothing', async () => {
       const rr = Weaver.create({ knex, cache });
       expect(await rr.weave()).toEqual([]);
diff --git a/src/weaver.ts b/src/weaver.ts
index c71f037..860b51c 100644
--- a/src/weaver.ts
+++ b/src/weaver.ts
@@ -54,8 +54,12 @@ export class Weaver<ID extends IdType = number, ROW extends RowType = RowType> {
           ) {
             const relRow = relationRows[relationRowIndex];
             if (fkValue === relRow[relation.column]) {
-              row[relation.property] = relRow;
-              break;
+              if (relation.type === 'ONE_TO_MANY') {
+                row[relation.property] = row[relation.property] ? [...row[relation.property], relRow] : [relRow];
+              } else {
+                row[relation.property] = relRow;
+                break;
+              }
             }
           }
         }