模板中的django反向外键

Question

嘿！

我有多个连接模型，想通过模板显示信息。所有模型都通过外键连接，但我只能在一个方向上显示信息。有谁知道如何反向显示两种方式？

我可以轻松获取'Survey'和'Certification'的信息，但无法获取'SurveyBga'和'Address'的信息。

感谢任何帮助！ :)

# models.py
class Survey(models.Model):
    survey_bga_id = models.ForeignKey(
        SurveyBga,
        on_delete=models.PROTECT,
        related_name="experiment"
    )
    year = models.PositiveSmallIntegerField(
        validators=[validate_year]
    )


class Certification(models.Model):
    survey_bga_yeardependent_id = models.ForeignKey(
        Survey,
        on_delete=models.PROTECT,
        related_name="certification"
    )
    type_of_experience = models.BooleanField(
        blank=True,
        null = True
    )


class Address(models.Model):
    street = models.CharField(
        max_length = 150,
        blank  = True,
    )


class SurveyBga(Address):
    internal_id = models.CharField(
        unique = True,
        max_length = 10
    )

# views.py

def experiment_bga_view(request):
    bga = Survey.objects.all()
    context = {"bga": bga}

    return render(request, 'app/template.html', context)

我试过了

{% for survey in bga %}
    {% for plant in survey.experiment_set.all %}
        {{plant.internal_id}}
    {% endfor %}
{% endfor %}

{% for survey in bga %}
    {% for plant in survey.experiment.all %}
        {{plant.internal_id}}
    {% endfor %}
{% endfor %}

{% for survey in bga %}
    {{survey.experiment.internal_id}}
{% endfor %}

Answer 1

您使用 related_name 的方式有误。我是：

要从“调查”访问“SurveyBga”，只需执行以下操作：

{% for survey in bga %}
    {{survey.survey_bga_id.internal_id}}
{% endfor %}

根据您的代码，您可以使用 related_name“实验”以相反的方式从“SurveyBga”访问“调查”。

surveybga = SurveyBga.objects.get(id=.....)
survey = surveybga.experiment

模板中的django反向外键

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