Retrieving the smallest and largest values of a Django model attribute within a template

My data model looks like this:

class Integer(models.Model):
    integer_value = models.IntegerField(default=0)
    current_price = models.DecimalField(max_digits=5, decimal_places=2, default=0.00)
    share = models.IntegerField(default=0)
    market = models.ForeignKey(
        IntegerMarket,
        on_delete=models.CASCADE,
        related_name='integers',
        default=None)

    def __str__(self):
        return str(self.integer_value)

    class Meta:
        ordering = ['integer_value']

The view I'm using is as follows:

class IntegerMarketDetailView(LoginRequiredMixin, DetailView):
    model = IntegerMarket
    template_name = 'integer_market_detail.html'
    login_url = 'login'

In my template for a specific instance of IntegerMarket, I want to find the minimum and maximum values of integer_value so I can use them as the min and max axis values in JavaScript.

For example, if I have an IntegerMarket instance with integers numbered 1 through 5, I need to extract 1 as the min value and 5 as the max value.

What's the simplest way to accomplish this task?

Answer №1

When you have an object named integer_market belonging to the class IntegerMarket, you can retrieve all associated instances of Integer by using the .integers attribute since you've set that as the related_name.

Afterwards, you can perform aggregation operations like finding the maximum and minimum values.

from django.db.models import Max, Min
integer_market.integers.aggregate(Max('integer_value'), Min('integer_value'))

>> {'integer_value__max': 10, 'integer_value__min': 0}

Answer №2

One of the great features of Django is the ability to define maximum and minimum values in queries.

To utilize this functionality, import Max and Min from django.db.models:

Then, when constructing your query, you can include something like the following:

my_query = models.IntegerMarket.objects.all().annotate(max_integer=Max('integer_value')).annotate(min_integer=Min('integer_value'))

Afterwards, in your view, you can access these values by calling max_integer/min_integer or whichever names you assigned.

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