Django - 从数据库创建一个下拉列表答案

【问题标题】：Django - Create a dropdown list from databaseDjango - 从数据库创建一个下拉列表
【发布时间】：2018-01-18 03:53:18
【问题描述】：

我是 Django 的新手，我想使用数据库中列的不同值创建一个下拉框：

models.py：

from django.db import models

class SensorsTable(models.Model):
    sensor_uuid = models.CharField(primary_key=True, max_length=32)
    sensor_desc = models.CharField(max_length=256)
    sensor_mid = models.CharField(max_length=256)
    gw_uuid = models.CharField(max_length=32, blank=True, null=True)
    sensor_loc_lat = models.DecimalField(max_digits=11, decimal_places=8, blank=True, null=True)
    sensor_loc_long = models.DecimalField(max_digits=11, decimal_places=8, blank=True, null=True)
    sensor_loc_blg = models.CharField(max_length=100, blank=True, null=True)
    sensor_loc_room = models.CharField(max_length=100, blank=True, null=True)
    sensor_loc_position = models.CharField(max_length=100, blank=True, null=True)

    class Meta:
        managed = False
        db_table = 'sensors_table'

    def __str__(self):
        return self.sensor_uuid

我想要一个下拉列表来包含 sensor_loc_room 的所有不同值，如果用户选择一个房间 (sensor_loc_room)，将显示显示房间中所有传感器的表格。

forms.py

from django.forms import ModelChoiceField
from django import forms
from .models import *


class LocationChoiceField(forms.ModelForm):
    #locations= forms.ModelChoiceField(queryset=InputLocation.objects.all())
    locations = forms.ModelChoiceField(queryset=SensorsTable.objects.all().values_list("sensor_loc_blg").distinct())

这是我当前的view.py（仅用于显示所有传感器的表格）：

from django.shortcuts import render

# Create your views here.

from django.http import HttpResponse
from django.template import loader
from django.shortcuts import render
from django.views.generic.edit import CreateView


from .models import *


#def index(request):
#    return HttpResponse("Smart Uni Analytics Test")


def index(request):
    query_results = SensorsTable.objects.all()
    locationForm = LocationChoiceField()

    context = {
        'query_results': query_results,

    }
    return render(request,'analytics/index.html', context)

和index.html（仅用于显示所有传感器的表格）：

<table>

    {% for item in query_results %}
    <tr>
        <td>{{ item.sensor_uuid }}</td>
        <td>{{ item.sensor_desc }}</td>
        <td>{{ item.sensor_mid }}</td>
        <td>{{ item.gw_uuid }}</td>
        <td>{{ item.sensor_loc_blg }}</td>
        <td>{{ item.sensor_loc_room }}</td>
        <td>{{ item.sensor_loc_position }}</td>
    </tr>
    {% endfor %}
</table>

任何建议或指导将不胜感激。谢谢！

【问题讨论】：

也许我真的很累，但我认为this 正是您要找的。span>

标签： mysql django dropdown

【解决方案1】：

我设法使用模型中列的不同值创建了一个下拉框。如果有人正在寻找答案：

models.py：

class SensorsTable(models.Model):
    sensor_uuid = models.CharField(primary_key=True, max_length=32)
    sensor_desc = models.CharField(max_length=256)
    sensor_mid = models.CharField(max_length=256)
    gw_uuid = models.CharField(max_length=32, blank=True, null=True)
    sensor_loc_lat = models.DecimalField(max_digits=11, decimal_places=8, blank=True, null=True)
    sensor_loc_long = models.DecimalField(max_digits=11, decimal_places=8, blank=True, null=True)
    sensor_loc_blg = models.CharField(max_length=100, blank=True, null=True)
    sensor_loc_room = models.CharField(max_length=100, blank=True, null=True)
    sensor_loc_position = models.CharField(max_length=100, blank=True, null=True)

    class Meta:
        managed = False
        db_table = 'sensors_table'

    def __str__(self):
        return self.sensor_uuid

forms.py

from django import forms
from .models import *


class LocationChoiceField(forms.Form):

    locations = forms.ModelChoiceField(
        queryset=SensorsTable.objects.values_list("sensor_loc_blg", flat=True).distinct(),
        empty_label=None
    )

views.py（最简单的方式）

from django.http import HttpResponse
from django.template import loader
from django.shortcuts import render
from django.views.generic.edit import CreateView
from .forms import *

from .models import *



def index(request):
    query_results = SensorsTable.objects.all()
    location_list = LocationChoiceField()

    context = {
        'query_results': query_results,
        'location_list': location_list,

    }
    return render(request,'analytics/index.html', context)

index.html

<body>

<div class="container">
    <p></p>
    <form method=POST action="">
        {{ location_list }}
    </form>



    <h1>All sensors</h1>
    <table>

        {% for item in query_results %}
        <tr>
            <td>{{ item.sensor_uuid }}</td>
            <td>{{ item.sensor_desc }}</td>
            <td>{{ item.sensor_mid }}</td>
            <td>{{ item.gw_uuid }}</td>
            <td>{{ item.sensor_loc_blg }}</td>
            <td>{{ item.sensor_loc_room }}</td>
            <td>{{ item.sensor_loc_position }}</td>
        </tr>
        {% endfor %}
    </table>
</div>
</body>

【讨论】：