【发布时间】：2021-02-23 18:56:41
【问题描述】：
我有几个模型，其中一个模型已经填充了数据（书名/章节号/段落号数据），我正在为每个用户实现该功能，以便能够为每个唯一的书名添加一个注释/章节编号/段落编号，我可以，但我已经堆叠了几天试图用当前用户的related_namenote检索书籍（如果有的话）。这是我的模型：
Book 已填充数据的模型。
from django.db import models
class Book(models.Model):
day = models.CharField(max_length=128)
book = models.CharField(max_length=128)
chapter = models.CharField(max_length=256)
paragraph = models.CharField(max_length=256)
text = models.TextField()
link = models.CharField(max_length=256)
def __str__(self):
return f'{self.book}_{self.chapter}.{self.paragraph} '
class Meta:
ordering = ['-id']
verbose_name = "Paragraph"
verbose_name_plural = "Paragraph"
这是Note 模型，它应该存储当前用户关于特定唯一书名/章节号/段落号的注释：
from django.db import models
from django.conf import settings
from rest_framework.reverse import reverse
from paragraphs.models import Book
class Note(models.Model):
owner = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='author', on_delete=models.CASCADE)
paragraph = models.ForeignKey(Book, related_name='note', on_delete=models.CASCADE)
created = models.DateTimeField(auto_now_add=True)
text = models.TextField(default=None)
def __str__(self):
return f'Note on {self.paragraph}'
class Meta:
ordering = ['created']
def save(self, *args, **kwargs):
"""
"""
options = {'text': self.text} if self.text else {}
super(Note, self).save(*args, **kwargs)
def get_absolute_url(self):
return reverse('note-detail', args=[self.id])
这是我的序列化程序：
Book序列化器
from rest_framework import serializers
from .models import Book
class BookSerializer(serializers.ModelSerializer):
class Meta:
model = Book
fields = '__all__'
Note序列化器
from rest_framework import serializers
from .models import Note
from users.serializers import UserSerializer
from paragraphs.serializers import BookSerializer
class NoteSerializer(serializers.ModelSerializer):
owner = UserSerializer(many=False, read_only=True)
class Meta:
model = Note
fields = ['id', 'owner', 'paragraph', 'text', 'created']
def to_representation(self, instance):
self.fields['paragraph'] = BookSerializer(read_only=True)
return super(NoteSerializer, self).to_representation(instance)
def user(self):
request = self.context.get('request', None)
if request:
return request.user
return None
def create(self, validated_data):
note, _ = Note.objects.update_or_create(
owner=self.user(),
paragraph=validated_data.get('paragraph', None),
defaults={'text': validated_data.get('text', None)})
return note
我得到的数据：
{
"id": 25,
"day": "2",
"book": "Some book",
"chapter": "1",
"paragraph": "3",
"text": "This is an example text that the user would like to attach a note to",
"link": "https://somelink.com",
}
我想要获取的数据：
{
"id": 25,
"day": "2",
"book": "Some book",
"chapter": "1",
"paragraph": "3",
"text": "This is an example text that the user would like to attach a note to",
"link": "https://somelink.com",
"note": "note of current user or none"
}
感谢任何帮助
【问题讨论】：
标签： python django django-models serialization django-rest-framework