hyukster90666

아무래도 프로젝트 설정파일을 못읽는거같아서os.environ["DJANGO_SETTINGS_MODULE"] = "backend.settings" 이 부분을 수정했더니 잘 됩니다. !! 감사합니다.os.environ["DJANGO_SETTINGS_MODULE"] = "backend.settings.settings로 바꿨어용 "

AttributeError: 'NoneType' object has no attribute 'send'

외부 <-> 프록시 서버(nginx) <-> nginx(<->gunicorn <-> flask) 가 아니라 프록시서버 <-> guniconr <->flask이네요

flask 서버관련 문의 드립니다

저도 이거 내심 궁금했었는데~ 좋은 정보 얻고 갑니다.

질문있습니다

강의가 너무 좋아요

강의들을 때마다 마지막 고생했다는 말이 좋아요

cached_property란?

덕분에 원하는 기능을 구현했어요
한개의 게시물이 있고&nbsp;
게시물에는 원하는대로 첨부파일을 넣을수&nbsp; 있는거죠
그리고&nbsp; 원하는대로 삭제하거나 중간만 업데이트 하거나 등등..
근데 이게 업데이트 할때랑 create할때랑 좀 로직이 바뀌어야되는거같아요
&nbsp;DRF 강력하긴 한데, 너무 강력해서 이게 커스터마이징하는데 투자시간이 너무 많이 드네요 ㅠ
<pre style="background-color: #2b2b2b; color: #a9b7c6; font-family: 'JetBrains Mono',monospace; font-size: 9.8pt;">from rest_framework import serializers from rest_framework.serializers import raise_errors_on_nested_writes from rest_framework.utils import model_meta from .models import NoticeBoard, NoticeBoardFile, NoticeBoardComment class NoticeBoardFileSerializers(serializers.ModelSerializer): file = serializers.FileField(use_url=True) class Meta: model = NoticeBoardFile fields = '__all__' def to_internal_value(self, data): data['name'] = data['file'].name return super().to_internal_value(data) def to_representation(self, instance): representation = super().to_representation(instance) representation.update( { "size": instance.file.size, } ) return representation class NoticeBoardListSerializers(serializers.ModelSerializer): author = serializers.CharField(source='author.fullname') class Meta: model = NoticeBoard fields = ['id', 'title', 'is_public', 'updated_at', 'author', 'views'] class NoticeBoardRetrieveSerializers(serializers.ModelSerializer): author = serializers.CharField(source='author.fullname') noticeboardfile_set = NoticeBoardFileSerializers(many=True) class Meta: model = NoticeBoard fields = '__all__' def validate(self, attrs): attrs = super().validate(attrs) request = self.context['request'] uploaded_files = [] if request.data.getlist('file'): for uploaded_file in request.data.getlist('file'): print(type(uploaded_file)) # print(uploaded_file.name) # serializer = NoticeBoardFileSerializers(data={'file': uploaded_file}) # serializer.is_valid(raise_exception=True) uploaded_files.append(uploaded_file) attrs['file'] = uploaded_files print(attrs) return attrs else: return attrs def update(self, instance, validated_data): raise_errors_on_nested_writes('update', self, validated_data) info = model_meta.get_field_info(instance) uploaded_files = [] file_object_list = [] str_list = [] already_uploaded_file_list = [] already_uploaded_file_list_temp = NoticeBoardFile.objects.filter(post=instance).values_list('id', flat=True) for temp in already_uploaded_file_list_temp: already_uploaded_file_list.append(temp) print('start', already_uploaded_file_list) if 'file' in validated_data: uploaded_files = validated_data.pop('file') if len(uploaded_files) > 0: for uploaded_file in uploaded_files: print(uploaded_file, type(uploaded_file)) if type(uploaded_file) == str: str_list.append(uploaded_file) continue else: file_object_list.append( NoticeBoardFile(post=instance, file=uploaded_file, name=uploaded_file.name)) NoticeBoardFile.objects.bulk_create(file_object_list) else: NoticeBoardFile.objects.filter(post=instance).delete() print(str_list, 'str_list') print('already_uploaded_file_list', already_uploaded_file_list) for already_uploaded_file in already_uploaded_file_list: print(already_uploaded_file) if str(already_uploaded_file) in str_list: continue if not str(already_uploaded_file) in str_list: print(already_uploaded_file, '는 없다.') NoticeBoardFile.objects.get(id=already_uploaded_file).delete() # Simply set each attribute on the instance, and then save it. # Note that unlike `.create()` we don't need to treat many-to-many # relationships as being a special case. During updates we already # have an instance pk for the relationships to be associated with. m2m_fields = [] for attr, value in validated_data.items(): if attr in info.relations and info.relations[attr].to_many: m2m_fields.append((attr, value)) else: setattr(instance, attr, value) instance.save() # Note that many-to-many fields are set after updating instance. # Setting m2m fields triggers signals which could potentially change # updated instance and we do not want it to collide with .update() for attr, value in m2m_fields: field = getattr(instance, attr) field.set(value) return instance class NoticeBoardCreateSerializers(serializers.ModelSerializer): class Meta: model = NoticeBoard fields = ['title', 'content', 'author'] def validate(self, attrs): attrs = super().validate(attrs) request = self.context['request'] uploaded_files = [] if request.data.getlist('file'): for uploaded_file in request.data.getlist('file'): print(type(uploaded_file)) print(uploaded_file.name) # serializer = NoticeBoardFileSerializers(data={'file': uploaded_file}) # serializer.is_valid(raise_exception=True) uploaded_files.append(uploaded_file) attrs['file'] = uploaded_files return attrs else: return attrs def create(self, validated_data): uploaded_files = [] file_object_list = [] if 'file' in validated_data: uploaded_files = validated_data.pop('file') post = super().create(validated_data) if len(uploaded_files) > 0: for uploaded_file in uploaded_files: file_object_list.append(NoticeBoardFile(post=post, file=uploaded_file, name=uploaded_file.name)) NoticeBoardFile.objects.bulk_create(file_object_list) return post def to_representation(self, instance): representation = super().to_representation(instance) representation.update( { "id": instance.id, } ) return representation </pre>

외래키 설정을 다르게 하는 경우

답변 감사합니다.
원하는대로 구현했는데 문제가 있습니다.
model.py
<pre style="background-color: #2b2b2b; color: #a9b7c6; font-family: 'JetBrains Mono',monospace; font-size: 9.8pt;">class NoticeBoard(models.Model): title = models.CharField(verbose_name='제목', max_length=512) content = models.TextField(verbose_name='내용') views = models.PositiveIntegerField(default=0, verbose_name='조회수') author = models.ForeignKey(AUTH_USER_MODEL, on_delete=models.PROTECT) is_public = models.BooleanField(verbose_name='공개 여부', default=True) created_at = models.DateTimeField(verbose_name='작성일자', auto_now_add=True) updated_at = models.DateTimeField(verbose_name='변경일자', auto_now=True) def __str__(self): return f'{self.title}' class NoticeBoardFile(models.Model): post = models.ForeignKey(NoticeBoard, on_delete=models.CASCADE) filename = models.CharField(verbose_name='파일명', max_length=128, blank=True) file = models.FileField(upload_to='files/%Y/%m/%d', blank=True) def delete(self, *args, **kwargs): if self.file: os.remove(os.path.join(settings.MEDIA_ROOT, self.file.path)) super(NoticeBoardFile, self).delete(*args, **kwargs)</pre>
serializers.py
<pre style="background-color: #2b2b2b; color: #a9b7c6; font-family: 'JetBrains Mono',monospace; font-size: 9.8pt;">class NoticeBoardFileSerializers(serializers.ModelSerializer): file = serializers.FileField(use_url=True) class Meta: model = NoticeBoardFile fields = '__all__' def to_internal_value(self, data): data['filename'] = data['file'].name return super().to_internal_value(data) def to_representation(self, instance): representation = super().to_representation(instance) representation.update( { "size": instance.file.size, } ) return representation</pre>
<pre style="font-family: 'JetBrains Mono', monospace; font-size: 9.8pt;">&nbsp;</pre>
<pre style="background-color: #2b2b2b; color: #a9b7c6; font-family: 'JetBrains Mono',monospace; font-size: 9.8pt;">class NoticeBoardCreateSerializers(serializers.ModelSerializer): class Meta: model = NoticeBoard fields = ['title', 'content', 'author'] def validate(self, attrs): attrs = super().validate(attrs) request = self.context['request'] uploaded_files = [] if request.data.getlist('file'): for uploaded_file in request.data.getlist('file'): print(type(uploaded_file)) print(uploaded_file.name) # serializer = NoticeBoardFileSerializers(data={'file': uploaded_file}) # serializer.is_valid(raise_exception=True) uploaded_files.append(uploaded_file) attrs['file'] = uploaded_files return attrs else: return attrs def create(self, validated_data): uploaded_files = [] file_object_list = [] if 'file' in validated_data: uploaded_files = validated_data.pop('file') post = super().create(validated_data) if len(uploaded_files) > 0: for uploaded_file in uploaded_files: file_object_list.append(NoticeBoardFile(post=post, file=uploaded_file)) NoticeBoardFile.objects.bulk_create(file_object_list) return post</pre>
마지막 시리얼라이즈에서&nbsp;
<pre style="background-color: #2b2b2b; color: #a9b7c6; font-family: 'JetBrains Mono', monospace; font-size: 9.8pt;"> # serializer = NoticeBoardFileSerializers(data={'file': uploaded_file}) # serializer.is_valid(raise_exception=True)</pre>
이 부분을 주석처리 해제하면 에러가 뜨는데 도저히 해결책을 모르겠어요
원하는 기능은 구현했는데 이럴 때 뭐가 문제인지 궁금합니다.
장고 시리얼라이즈 너무 어려워요 ㅠㅠㅠㅠㅠㅠㅠㅠ
&nbsp;
아울러 프론트엔드에서 보낼 때는&nbsp;
fileList를 보내면 str값으로 보내져서
그냥&nbsp;
<pre style="background-color: #2b2b2b; color: #a9b7c6; font-family: 'JetBrains Mono',monospace; font-size: 9.8pt;">formData.append('title', title_value) formData.append('content', value) formData.append('author', '0000') if(files.length > 0){ files.forEach(file => { formData.append('file', file) }) }</pre>
이런 식으로 보내야되는거 같아요&nbsp;
&nbsp;

<pre style="background-color: #2b2b2b; color: #a9b7c6; font-family: 'JetBrains Mono',monospace; font-size: 9.8pt;">def validate(self, attrs): attrs = super().validate(attrs) </pre>
질문 1&nbsp;
이 validate는 상속받아서 구현하는건 알겠는데
attrs = super().validate(attrs)
이부분은 왜 하는걸까요? ㅠ 진짜 파이썬에 대해서 하나도 모른다는걸 실감하네요 ㅠ
&nbsp;
질문 2
self.context['request']
이 부분인데 의미를 더 알고 싶습니다. self.context 이부분이요
&nbsp;
질문 3
그럼 로직이 일단 시리얼라이즈가 뷰에서 호출되면&nbsp;
validate 함수가 발동이 되면서 이걸 호출해서 검증을 해주면 되고&nbsp;
이 attrs 결과가 validated_data로 들어가는거죠?
&nbsp;
질문4
drf에&nbsp;
serializers.ImageField가 있는데 모델에서 이미지필드가 있다면 따로 적용안해도 되는부분인가요.??

models.py
<pre style="background-color: #2b2b2b; color: #a9b7c6; font-family: 'JetBrains Mono',monospace; font-size: 9.8pt;">class NoticeBoard(models.Model): title = models.CharField(verbose_name='제목', max_length=512) content = models.TextField(verbose_name='내용') author = models.ForeignKey(AUTH_USER_MODEL, on_delete=models.PROTECT) is_public = models.BooleanField(verbose_name='공개 여부', default=True) created_at = models.DateTimeField(verbose_name='작성일자', auto_now_add=True) updated_at = models.DateTimeField(verbose_name='변경일자', auto_now=True) def __str__(self): return f'{self.title}' class NoticeBoardFile(models.Model): post = models.ForeignKey(NoticeBoard, on_delete=models.CASCADE, related_name='noticeboardfile') file = models.FileField(upload_to='files/%Y/%m/%d')</pre>
serializers.py
<pre style="background-color: #2b2b2b; color: #a9b7c6; font-family: 'JetBrains Mono',monospace; font-size: 9.8pt;">class NoticeBoardFileSerializers(serializers.HyperlinkedModelSerializer): file = serializers.FileField(use_url=True) class Meta: model = NoticeBoardFile fields = ['post', 'file'] class NoticeBoardSerializers(serializers.ModelSerializer): noticeboardfile = NoticeBoardFileSerializers(many=True) class Meta: model = NoticeBoard fields = ['title', 'content', 'author', 'is_public', 'created_at', 'updated_at', 'noticeboardfile'] def create(self, validated_data): files_data = validated_data.pop('file') noticeboard = NoticeBoardFile.objects.create(**validated_data) for file_data in files_data: NoticeBoardFile.objects.create(post_id=noticeboard, **file_data) return noticeboard</pre>
현재 이렇게 직렬화를 해서 성공은 했는데(모델은 본문의 2와 동일합니다.)
생각해보니 게시판에 게시글을 이렇게 올릴 때&nbsp;
게시글이 만들어지고나서, 게시글에 첨부파일들을 넣어줘야 되는데
drf로 구현할려니 어렵네요.
&nbsp;
프론트엔드에서
사용자가 게시글 1개와 게시글1에 대해 첨부파일 5개를 넣어서 작성버튼을 누르면
&nbsp;
백엔드에 요청보낼 때는 NoticeBoard모델에 대해 요청을 보내서
백엔드에서 NoticeBoard모델에 대한 객체를 만들고 응답값으로 NoticeBoard의 주소를 보내주면
다시 프론트엔드에서 NoticeBoard주소 + 파일 데이터(파일 5개)에 대해서 요청을 다시 보내줘야되는가요?
&nbsp;
동시에 보내면 파일데이터는 참조할 수 있는 모델이 없기 때문에 처리가 안될거같은데요
&nbsp;
제가 생각하는 방식이 맞는지 아니면 동시에 보낼 수 있는지 궁금하네요 보통 어떻게 처리하는지도 궁금하구요 ㅠ

hyukster90666

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