Question

我有两个django模型：生物学和发生。他们有一对一的关系。生物学模型具有发生的外键，并且tastypie生物学资源遵循这种关系并正确地显示相应的发生数据。我试图让反向查找在API中工作。当我尝试访问occurrenceResource时，出现错误

"error: "The model '2' has an empty attribute 'occurrence' and doesn't allow a null value.""

我的tastypie资源类看起来像这样

class biologyResource(ModelResource):
    occurrence = fields.ToOneField("API.API_resources.occurrenceResource", "occurrence")
    class Meta:
        queryset = biology.objects.all()
        resource_name = 'biology'


class occurrenceResource(ModelResource):
    biology = fields.ToOneField("API.API_resources.biologyResource", "id", full=True)
    class Meta:
        queryset = occurrence.objects.all()
        resource_name = 'occurrence'

我见过some similar stackoverflow questions，但他们主要处理的是多对多关系。有什么想法吗？

Answer 1

在这种情况下，有一条规则非常有用。几乎总是资源字段的属性是模型字段的属性。

如果您的模型有字段：

my_field = model.WhateverField（）

因此，资源定义必须具有：

my_field = fields.WhateverField（＆＃34; Whatever＆＃34;，attribute =＆＃34; my_field ＆＃34;）

如何通过发生来获取生物学？

>>> biology_object.occurrence # I assume your model name is `Occurrence`

以其他方式：

>>> occurrence_object.biology # I assume your model name is `Biology`

所以occurrence和biology是模型的属性，换句话说它们是属性。

class biologyResource(ModelResource):
    occurrence = fields.ToOneField("API.API_resources.occurrenceResource", attribute="occurrence")
    class Meta:
        queryset = biology.objects.all()
        resource_name = 'biology'


class occurrenceResource(ModelResource):
    biology = fields.ToOneField("API.API_resources.biologyResource", attribute="biology", full=True)
    class Meta:
        queryset = occurrence.objects.all()
        resource_name = 'occurrence'

如果遇到问题，请复制粘贴模型。

如何让tastypie对外键进行反向查找？

1 个答案: