如何使用带有外键的 django api

Question

我尝试在 django restframework 序列化程序中保存外键。

我的目标是从 iframely.com 保存数据库信息，这部分效果很好。但我还需要将其保存在特定类别中。添加字段“Board（我的类别名称字段）”后出现错误：“board_id”列中的空值违反非空约束

我的模特：

class Embed(models.Model):
    url = models.URLField(max_length=255)
    title = models.CharField(max_length=255)
    description = models.TextField()
    thumbnail_url = models.URLField(max_length=255)
    html = models.TextField()
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    board = models.ForeignKey(Board, on_delete=models.CASCADE, verbose_name='Kategoria')

表格：

class SubmitEmbed(forms.Form):
    url = forms.URLField()
    board = forms.ModelChoiceField(queryset=Board.objects.all())

序列化器：

class EmbedSerializer(serializers.ModelSerializer):
    author = serializers.HiddenField(default=serializers.CurrentUserDefault())
    board = serializers.RelatedField(read_only=True)

    class Meta:
        model = Embed
        fields = '__all__'

查看：

def save_embed(request):

    if request.method == "POST":
        form = SubmitEmbed(request.POST)
        if form.is_valid():
            url = form.cleaned_data['url']
            r = requests.get('http://iframe.ly/api/oembed?url=' + url + '&key=' + settings.IFRAMELY_KEY)
            json = r.json()
            serializer = EmbedSerializer(data=json, context={'request': request})
            if serializer.is_valid():
                embed = serializer.save()
                return render(request, 'embed/embeds.html', {'embed': embed})
    else:
        form = SubmitEmbed()

    return render(request, 'embed/embedadd.html', {'form': form})

Answer 1

因为你有

class EmbedSerializer(serializers.ModelSerializer):
    author = serializers.HiddenField(default=serializers.CurrentUserDefault())
    board = serializers.RelatedField(read_only=True)

您已将董事会设置为read_only。当提供此字段并进行 DRF 验证时，DRF 将删除此字段。

您可以删除整行，它会起作用。