Question

我想使用多对多表格来参考要在我的网站页面上显示的专业

Model.py

from django.db import models

class Major(models.Model):
    name = models.CharField(max_length=30, db_index=True)

class School(models.Model):
    name = models.CharField(max_length=50, db_index=True)
    school_Major_merge = models.ManyToManyField(Major, through='School_Major')

class School_Major(models.Model):
    major = models.ForeignKey(Major, on_delete=models.CASCADE)
    school = models.ForeignKey(School, on_delete=models.CASCADE)


class professor(models.Model):
    ProfessorIDS = models.IntegerField()
    ProfessorName = models.CharField(max_length=100)
    ProfessorRating = models.DecimalField(decimal_places=2,max_digits=4)
    NumberofRatings = models.CharField(max_length=50)
    #delete major from the model  
    school = models.ForeignKey(School , on_delete=models.CASCADE)
    major = models.ForeignKey(Major , on_delete=models.CASCADE)

    def __str__(self):
        return self.ProfessorName

views.py

from django.http import HttpResponse
from django.shortcuts import render
from .models import professor, School , School_Major, Major


def index(request):
    # professors = professor.objects.all()
    # return render(request, 'locate/index.html', {'professors': professors})
    schools = School.objects.all()
    return render(request, 'locate/index.html', {'schools': schools})


def Major(request, Major):
    major_choice = professor.objects.filter(Major =Major)
    return render(request, 'locate/major.html', {'major_choice': major_choice})

url.py

from django.urls import path

from . import views


urlpatterns = [
    path('', views.index, name='index'),
    path('<str:Major>/', views.Major, name='Major')
]

基本上，我正在尝试找出我的观点。在选择特定学校时，我将能够使用School_Major专门引用要显示在我网站主要部分中的专业，

在我的index.html上，我有以下for循环

  <ul>
    {% for list in schools %}
    <li><a href="{% url 'view' '{{list.id}}' %}">{{list.name}}</a></li>
    <br><br>
    {%endfor%}
  </ul>

“视图” 是一种功能，它将采用School PK并使用School_Major表来引用该学校可以使用的专业，并显示“专业”。

我将为每个表格提供示例图片，以实现更直观的显示。

学校

学校专业

主要

Answer 1

我不知道您为什么创建School_Major模型。

访问M2M。在模型下方添加功能

def get_yourfunctionname(self):
    return ", ".join([x.field_you_want for x in self.your_M2M_Field_name.all()])

在模板中

    <ul>
    {% for list in schools %}
    <li><a href="{% url 'view' '{{list.id}}' %}">{{list.get_yourfunctionname}}</a></li>
    <br><br>
    {%endfor%}
  </ul>

如何从多对多查询中从模板Django的数据库表中选择特定项目

1 个答案: