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Djangoroidの奮闘記

python,django,angularJS1~三十路過ぎたプログラマーの奮闘記

Django REST Frameworkに再挑戦 その11 Comment Children & Reply Count

概要

Django REST Frameworkに再挑戦 その11 Comment Children & Reply Count

参考サイト

www.django-rest-framework.org

www.codingforentrepreneurs.com

Comment Children & Reply Count

  • comments/api/serializers.pyを修正する。
from rest_framework.serializers import (
        HyperlinkedIdentityField,
        ModelSerializer,
        SerializerMethodField,
        )

from comments.models import Comment

class CommentSerializer(ModelSerializer):
    class Meta:
        model = Comment
        fields = [
            'id',
            'content_type',
            'object_id',
            'parent',
            'content',
        ]


class CommentChildSerializer(ModelSerializer):
    class Meta:
        model = Comment
        fields = [
            'id',
            'content',
            'timestamp',
        ]


class CommentDetailSerializer(ModelSerializer):
    replies = SerializerMethodField()
    class Meta:
        model = Comment
        fields = [
            'id',
            'content_type',
            'object_id',
            'content',
            'replies',
        ]
    def get_replies(self, obj):
        if obj.is_parent:
            return CommentChildSerializer(obj.children(), many=True).data
        return None

        """
        def children(self):
            return Comment.objects.filter(parent=self)
        """
  • views.pyをセットする。
class CommentDetailAPIView(RetrieveAPIView):
    queryset = Comment.objects.all()
    serializer_class = CommentDetailSerializer
  • エラーが出ると思うのでurls.pyを修正する。(id->pkに修正)

  • replyの数を数えるserializermethodfieldを付け加える。

from rest_framework.serializers import (
        HyperlinkedIdentityField,
        ModelSerializer,
        SerializerMethodField,
        )

from comments.models import Comment

class CommentSerializer(ModelSerializer):
    reply_count = SerializerMethodField()
    class Meta:
        model = Comment
        fields = [
            'id',
            'content_type',
            'object_id',
            'parent',
            'content',
            'reply_count',
            'timestamp',
        ]
    def get_reply_count(self, obj):
        if obj.is_parent:
            return obj.children().count()
        return 0

    """
    def children(self): #replies
        return Comment.objects.filter(parent=self)
    """


class CommentChildSerializer(ModelSerializer):
    class Meta:
        model = Comment
        fields = [
            'id',
            'content',
            'timestamp',
        ]


class CommentDetailSerializer(ModelSerializer):
    reply_count = SerializerMethodField()
    replies = SerializerMethodField()
    class Meta:
        model = Comment
        fields = [
            'id',
            'content_type',
            'object_id',
            'content',
            'reply_count',
            'replies',
            'timestamp',
            'count',
        ]
    def get_replies(self, obj):
        if obj.is_parent:
            return CommentChildSerializer(obj.children(), many=True).data
        return None

    def get_reply_count(self, obj):
        if obj.is_parent:
            return obj.children().count()
        return 0

        """
        def children(self):
            return Comment.objects.filter(parent=self)
        """