Mysql Django-从数据库创建下拉列表

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

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），则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())

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
    )

这是my current view.py（仅用于显示所有传感器的表格）：

和index.html（仅用于显示所有传感器的表格）：

{查询结果%中的项的百分比}
{{item.sensor_uuid}
{{item.sensor_desc}}
{{item.sensor_mid}
{{item.gw_uuid}
{{item.sensor_loc_blg}}
{{item.sensor_loc_room}
{{item.sensor_loc_position}
{%endfor%}

---

如有任何建议或指导，将不胜感激。谢谢

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：

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

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.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())

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）

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>

{{location_list}}
所有传感器
{查询结果%中的项的百分比}
{{item.sensor_uuid}
{{item.sensor_desc}}
{{item.sensor_mid}
{{item.gw_uuid}
{{item.sensor_loc_blg}}
{{item.sensor_loc_room}
{{item.sensor_loc_position}
{%endfor%}

也许我真的很累，但我想这就是你想要的。