How to access ManyToOneForeignKey data without making extra queries in Wagtail(django)

问题

I have the following two classes in my app.models and i'm using the wagtail APIs to get the data as json

class States(Page):
    name=models.CharField(max_length=50)

class Cities(Page):
    def get_state_name(self):
        return self.state.name
    name = models.CharField(max_length=50)
    state = models.ForeignKey(States, related_name='related_cities' )
    state_name = property(get_state_name)

So, when I try /api/v1/pages/?type=dashboard.States&fields=name,related_cities, it returns the following data:

{
    "meta": {
        "total_count": 1
    },
    "pages": [
        {
            "id": 1,
            "name": "State1",
            "meta": {
                "type": "dashboard.States",
                "detail_url": "http://localhost:8000/api/v1/pages/2601/"
            },
            "related_cities": [
                {
                    "id": 28,
                    "meta": {
                        "type": "dashboard.Cities",
                        "detail_url": "http://localhost:8000/api/v1/pages/28/"
                    }
                },
                {
                    "id": 37,
                    "meta": {
                        "type": "dashboard.Cities",
                        "detail_url": "http://localhost:8000/api/v1/pages/37/"
                    }
                },
            ]
        }
    ]
}

In the related_cities field, it returns id and meta of the cities. How can I get the name of the city in the response here, without making an extra query? :/

I couldn't find any solution in the Documentation. Am I missing something? I want the response something like this

            "related_cities": [
                {
                    "id": 28,
                    "name": "SomeCityName1",
                    "meta": {
                        "type": "dashboard.Cities",
                        "detail_url": "http://localhost:8000/api/v1/pages/28/"
                    }
                },
                {
                    "id": 37,
                    "name": "SomeCityName2",
                    "meta": {
                        "type": "dashboard.Cities",
                        "detail_url": "http://localhost:8000/api/v1/pages/37/"
                    }
                },
            ]

回答1:

Adding the name there isn't possible without having to override bits of Wagtail's API module.

But this is something we are working on for version 2 of the API (see: https://github.com/kaedroho/weps/blob/api-fields/draft/005-wagtail-api-fields.rst#nested-objects).

来源：https://stackoverflow.com/questions/36498417/how-to-access-manytooneforeignkey-data-without-making-extra-queries-in-wagtaild

标签

python

django

api

wagtail