Django REST-元数据中与ForeignKey相关的模型的URL（OPTIONS）

Question

我正在寻找如何在元数据（OPTIONS）中获取与ForeignKey相关的模型的URL。

楷模：

Class Country(models.Model):
    pass

Class City(models.Model):
    country = ForeignKey(Country)

希望下面的“ choices_url”可以显示在OPTIONS上：

城市的API（选项）

"actions": {
    "POST": {
        "country": {
            "type": "related",
            "required": true,
            "read_only": false,
            "label": "Country",
            "choices_url": "http://example.com/api/country/"

谢谢。

Answer 1

我检查了一下，它从“ view_name”反向指向一个URL，并且该字段的view_name是“ {basename} -detail”。 使用以下类覆盖SimpleMetadata，并在settings.py中将其设置为默认元数据类。 问题已经解决。 “ choices_url”显示为list_view URL。

import re


def get_view_name(view_name: str, view_type: str) -> str:
    if view_type in ['list', 'detail']:
        return re.sub('(.*)-[^.]*', f'\\1-{view_type}', view_name)
    raise ValueError(
        f"Wrong view_type. It should be either 'list' or 'detail'. "
        f'<:param view_type>: {view_type}')

class RestMetadata(SimpleMetadata):    
    def get_field_info(self, field):
        field_info = super().get_field_info(field)
        if (not field_info.get('read_only') and
                hasattr(field, 'choices')):
            if isinstance(field, serializers.HyperlinkedRelatedField):
                view_name = get_view_name(field.view_name, 'list')
                field_info['choices_url'] = field.reverse(view_name, request=field.parent.context['request'])
            elif (
                    isinstance(field, serializers.ManyRelatedField)
                    and isinstance(field.child_relation, serializers.ManyRelatedField)):
                field_child = field.child_relation
                view_name = get_view_name(field_child.view_name, 'list')
                field_info['choices_url'] = field_child.reverse(view_name, request=field.parent.context['request'])

        return field_info

{Project} /settings.py

REST_FRAMEWORK = {
    'DEFAULT_METADATA_CLASS': '{Path-of-RestMetadata}.RestMetadata'
}

谢谢。