Django query from multiple table base on FK - django

Question

hi i am new in django coding
i have 3 tables(models) in my different Django app , i try to make a simple report in htmpl page , so need to retrive specific data for each item base on foreign key.
by below code i can accress machine stored table in Html page by
making a loop , but i want to fetch data from other table and filter them ,
{% for m in machines %}
<h2>{{m.title}}</h2>
<h3>{{}}</h3>.
//i** need to access the ordertitle field in tb_order base on machine id. ??**
<p>{{ }}</p>.
// **access ordertitle in tb_order base on status field ??**
{%end for %}`
here is a view.py
def allmachinesLOGO(request):
machines=Machine.objects.all()
context ={'machines':machines}
return render(request,'pline/machineslogos.html',context)
Models :
class tb_order(models.Model):
ordertitle= models.CharField(max_length=200)
customer=models.ForeignKey(Customer, null=True, on_delete=models.SET_NULL)
mould=models.ForeignKey(Mould, null=True, on_delete=models.SET_NULL, blank=True)
status=models.CharField(choices=status_choices, default="0", max_length=20)
accept=models.BooleanField
machine=models.ForeignKey(Machine,null=True, on_delete=models.SET_NULL, blank=True)
id =models.UUIDField(default=uuid.uuid4, primary_key=True, editable=False, unique=True)`
class Machine(models.Model):
title = models.CharField(max_length=200)
machine_model = models.CharField(max_length=200, null=True, blank=True)
description = models.CharField(max_length=600, null=True, blank=True)
featured_image=models.ImageField(default="defaultmachine.webp", blank=True, null=True)
id=models.UUIDField(default=uuid.uuid4, unique=True,primary_key=True,editable=False)`
advice a solution
access ordertitle in tb_order base on status field ??
// i need to access the ordertitle field in tb_order base on machine id.

Answer 1

By using the primary model, you can get the data associated with it from the secondary model. To do this, a special property (object) with the name secondary model_set is created in the primary model by default. In your case, for example: tb_order_set(lower case). Using related_name for the ForeignKey (in which case it will be whatever you write it without the _set prefix).
In the template, the outer loop loops through the rows of the model: Machine. The internal one, through tb_order_set.all, accesses the rows of the tb_order model. Although in my opinion it is better to do all calculations and comparisons in views, and in templates only display information.
Template file:
{% for m in machines %}
<p>{{ m.tb_order_set.all }}</p>
{% for r in m.tb_order_set.all %}
<p>{{ 'ordertitle' }} : {{ r.ordertitle }} {{ 'status' }} : {{ r.status }}</p>
{% endfor %}
{% endfor %}
To show by specific status:
{% for m in machines %}
<p>{{ m.tb_order_set.all }}</p>
{% for r in m.tb_order_set.all %}
{% if r.status == '2' %}
<p>{{ 'ordertitle' }} : {{ r.ordertitle }} {{ 'status' }} : {{ r.status }}</p>
{% endif %}
{% endfor %}
{% endfor %}