如何在Django rest框架中检索外键字段？

bayman 发表于 Dev

130

贝曼

给定下面的模型和序列化器类，当我检索Track细节时，它将仅显示Track标题，而不显示相关的Artist。

检索曲目详细信息时，我还将如何显示歌手姓名？

models.py

class Artist (models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name

class Track (models.Model):    
    artist = models.ForeignKey(Artist, blank=True, null=True, on_delete=models.SET_NULL, verbose_name="Artist")
    title = models.CharField(max_length=100, verbose_name="Title")

    def __str__(self):
        return self.title

serializers.py

class ArtistSerializer(serializers.ModelSerializer):

    id = serializers.IntegerField(read_only=True)
    name = serializers.CharField()

    class Meta:
        model = Artist
        fields = ('id', 'name')

class TrackSerializer(serializers.ModelSerializer):

    class Meta:
        model = Track
        fields = '__all__'

谢尔盖M.

我认为您需要自定义字段，请尝试以下序列化程序：

class TrackSerializer(serializers.ModelSerializer):
    class Meta:
        model = Track
        fields = ('title', 'artist','artist_name')

    artist_name = serializers.SerializerMethodField('get_artists_name')

    def get_artists_name(self, obj):
        return obj.artist.name

它产生这样的东西。

[
    {
        "title": "Don't let me down",
        "artist": 2,
        "artist_name": "The Beatles"
    },
    {
        "title": "Summertime",
        "artist": 1,
        "artist_name": "Ella Fitzgerald"
    }
]

最好的祝福。

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