78 lines
2.1 KiB
Python
78 lines
2.1 KiB
Python
from rest_framework import serializers
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from apps.shelf_items.models import ShelfItem
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from apps.books.models import Book
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from apps.shelves.models import Shelf
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from apps.shelves.serializers import ShelfSerializer
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from apps.books.serializers import BookSerializer
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class ShelfItemSerializer(serializers.ModelSerializer):
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shelf = ShelfSerializer(read_only=True)
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shelf_id = serializers.PrimaryKeyRelatedField(
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queryset=Shelf.objects.all(),
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source="shelf",
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write_only=True
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)
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book = BookSerializer(read_only=True)
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book_id = serializers.PrimaryKeyRelatedField(
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queryset=Book.objects.all(),
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source="book",
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write_only=True
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)
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class Meta:
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model = ShelfItem
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fields = [
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"id",
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"shelf",
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"shelf_id",
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"book",
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"book_id",
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"quantity"
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]
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read_only_fields = ["id"]
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def __init__(self, instance=None, data=..., **kwargs):
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super().__init__(instance, data, **kwargs)
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request = self.context.get("request")
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if request and request.user:
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self.fields["shelf_id"].queryset = Shelf.objects.filter(
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user=request.user
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)
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self.fields["book_id"].queryset = Book.objects.filter(
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user=request.user
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)
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def validate(self, attrs):
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attrs = super().validate(attrs)
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book = attrs.get("book")
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shelf = attrs.get("shelf")
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if book and shelf:
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qs = ShelfItem.objects.filter(
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book=book,
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shelf=shelf
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)
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if self.instance:
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qs = qs.exclude(pk=self.instance.pk)
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if qs.exists():
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raise serializers.ValidationError(
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"This Book already exists in shelf!"
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)
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if book.user_id != shelf.user_id:
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raise serializers.ValidationError(
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"Book and Shelf must be from the same user!"
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)
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return attrs
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