Django模板，如果项目的ID等于父循环名称，则遍历所有项目 [英] Django template, loop through items if their id is equal to parent loop name
问题描述
我试图遍历不同的区域，然后显示属于该区域的项目
I'm trying to loop through different Zones and then show the items which are part of this zone
区域是一个模型，具有名称和ForeignKey.Planche是一个以Zone为ForeignKey的模型.
Zone is a model, has a name and a ForeignKey. Planche is a model which has Zone as ForeignKey.
我正在遍历区域以显示每个区域.在该循环中，我将循环所有Planches，并只显示那些以Zone为外键的Planches.
I'm looping through zones to display each zone. In that loop I'm looping all Planches and would like to display only the ones that have Zone as a ForeignKey.
class Zones(models.Model):
name = models.CharField(max_length=30)
genre = models.ForeignKey(ZoneTypes, on_delete=models.CASCADE)
def __str__(self):
return self.name
class Planche(models.Model):
pzone = models.ForeignKey(Zones, on_delete=models.CASCADE)
ref = models.CharField(max_length=5, default="1")
length = models.IntegerField()
width = models.IntegerField()
orientation = models.CharField(max_length=30)
def __str__(self):
return self.ref
模板
<div>
<h1><a href="/">My list of planches</a></h1>
</div>
{% for z in zones %}
<div>
<h2><a href="/zone/{{ z.name }}">Zone name: {{ z.name }}</a></h2>
{% for p in planches %}
{% if p.pzone == z.name }
<h1><a href="planche/{{ planche.ref }}">Ref: {{ p.ref }}</a></h1>
<p>Length: {{ p.length }} - Width: {{ p.width }}</p>
<p>Orientation: {{ p.orientation }}
{% endif %}
{% endfor %}
</div>
{% endfor %}
{％，如果p.pzone = z.name％}返回False，如果我只显示它们{{p.pzone}}和{{z.name}}，它们都返回相同的字符串，但是我猜它们不是同一数据类型.我尝试将它们转换为{％with％}语句中的字符串，但我一直失败
{% if p.pzone = z.name %} returns False, They both return the same string if I just display them {{ p.pzone }} and {{ z.name }} but I guess they aren't the same data type. I tried converting them to strings in a {% with %} statement but I keep failing
推荐答案
我假设您要显示每个区域的所有切缝.您可以使用 ForeignKey 上的 related_name 来访问引用当前对象的项目.您没有在此处设置任何相关名称，因此它是默认名称: planche_set .
I'm assuming you want to display all the planches for each zone. You can use the related_name on the ForeignKey to access to items referencing the current object. You did not set any related name there, so it's the default one: planche_set.
<div>
<h1><a href="/">My list of planches</a></h1>
</div>
{% for z in zones %}
<div>
<h2><a href="/zone/{{ z.name }}">Zone name: {{ z.name }}</a></h2>
{% for p in z.planche_set.all %}
<h1><a href="planche/{{ planche.ref }}">Ref: {{ p.ref }}</a></h1>
<p>Length: {{ p.length }} - Width: {{ p.width }}</p>
<p>Orientation: {{ p.orientation }}
{% endfor %}
</div>
{% endfor %}
请注意，除非您在该方法中添加 prefetch_related('planche')，否则该方法将执行N + 1个查询(一个用于选择区域，然后每个区域一个查询以检索每个区域的板).查看您选择区域的位置.
Be aware that method will execute N+1 queries (One to select your zones then one query per zone to retrieve the planches of each zone) unless you add prefetch_related('planche') in the view where your select your zones.
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