[Django] ValueError - Cannot assign "'1'": "Board.member_no" must be a "Member" instance. 외래키가 있는 칼럼에서 글생성시 에러메세지

Member 상에 no 라는 PK 가 있고, Board 상에 이와 연결된 member_no 라는 외래키 FK 가 있을때, 

Board 글 삽입시 아래와 같은 에러메세지를 만났다.

 

ValueError at /board/write/

Cannot assign "'1'": "Board.member_no" must be a "Member" instance.

Request Method:	POST
Request URL:	http://127.0.0.1:8000/board/write/
Django Version:	4.0.4
Exception Type:	ValueError
Exception Value:	Cannot assign "'1'": "Board.member_no" must be a "Member" instance.
Exception Location:	/Users/jongwon/PycharmProjects/django_test2/venv/lib/python3.10/site-packages/django/db/models/fields/related_descriptors.py, line 235, in __set__
Python Executable:	/Users/jongwon/PycharmProjects/django_test2/venv/bin/python
Python Version:	3.10.4
Python Path:	['/Users/jongwon/PycharmProjects/django_test2',  '/Library/Frameworks/Python.framework/Versions/3.10/lib/python310.zip',  '/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10',  '/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/lib-dynload',  '/Users/jongwon/PycharmProjects/django_test2/venv/lib/python3.10/site-packages']
Server time:	Thu, 05 May 2022 23:40:25 +0900

 

위의 에러 메세지를 보면 ORM 프로그램이라서, 막연히 member_no 를 POST 결과 값으로 받아서 아래와 같이 Insert 할때 에러가 났다.

 

board = Board(member_no=member_no, subject=subject, content=content, read_num=0, image1=image1, upfile1=upfile1)
board.save()

아래와 같이 member_no 부분을 변경하도록 하자 

 

 

board = Board(member_no=Member.objects.get(pk=member_no), subject=subject, content=content, read_num=0, image1=image1, upfile1=upfile1)
board.save()

 

 

https://stackoverflow.com/questions/37839867/django-error-cannot-assign-must-be-an-instance