如何显示从 model 到 Django 模板的元组字段？

Question

I'm pretty new to Django here guys so go easy on me please...

Let me elaborate on what the title question says. Basically I have this model....

    class Meta:
        verbose_name_plural = 'Digital Media'

    CATEGORY_CHOICES = (
        ('icon_sets', 'Icon Sets'),
        ('brand_logos', 'Brand Logos'),
        ('web_banners', 'Web Banners')
    )
    name = models.CharField(max_length=20, choices=CATEGORY_CHOICES)

    SIZE_CHOICES = (
        ('1616', '16 x 16 pixels'),
        ('3232', '32 x 32 pixels'),
        ('6464', '64 x 64 pixels'),
        ('128128', '128 x 128 pixels'),
        ('256256', '256 x 256 pixels')
    )
    sizes = models.CharField(max_length=20, choices=SIZE_CHOICES)

    def __str__(self):
        return self.name

and this view...

def product_detail(request, product_id):
    """ A view to show individual product details """

    print_media = Print_Media.objects.all()
    digital_media = Digital_Media.objects.all()

    product = get_object_or_404(Product, pk=product_id)

    print(product, print_media, digital_media)
    context = {
        'product': product,
        'print_media': print_media,
        'digital_media': digital_media,
    }
    return render(request, 'products/product_detail.html', context)

So "IF" all is ok with the above code, can someone help me to get the field "sizes" from the model onto a template as I'm having trouble doing this on my own - here is what I have tried so far...

{% with product.is_print_media as p %}
    {% if p %}
        <div class="col-12">
            {{ p.sizes }}
            <p><strong>Size:</strong></p>
            <select class="form-control rounded-0 w-50" name="product_size" id="id_product_size">
                <option value="{{ p.sizes }}"></option>
                <option value=""></option>
                <option value="" selected></option>
                <option value=""></option>
                <option value=""></option>
            </select>
        </div>
    {% endif %}
{% endwith %}

Any help with this is much appreciated:)

Again - go easy on the newbie.....

Answer 1

If SIZE_CHOICES is attribute of model Print_Media you can access it us p.SIZE_CHOICES in template.

Otherwise, provide it as context in your view Digital_Media.SIZE_CHOICES :

def product_detail(request, product_id):
    """ A view to show individual product details """

    print_media = Print_Media.objects.all()
    digital_media = Digital_Media.objects.all()

    product = get_object_or_404(Product, pk=product_id)

    print(product, print_media, digital_media)
    context = {
        'product': product,
        'print_media': print_media,
        'digital_media': digital_media,
        
    }
    return render(request, 'products/product_detail.html', context)

In template size_choices or p.SIZE_CHOICES . Assuming that you used size_choices :

{% with product.is_print_media as p %}
    {% if p %}
        <div class="col-12">
            {{ p.sizes }}
            <p><strong>Size:</strong></p>
            <section class="mt-20">
                <select class="form-control rounded-0 w-50" name="product_size" id="id_product_size_{{ p.pk }}">
                {% for size in size_choices %}
                <option value="{{ item.0 }}" {% if size.0 == p.sizes %}selected{% endif %}>{{ item.1 }}</option>
                {% endfor %}
            </select>
        </div>
    {% endif %}
{% endwith %}

Answer 2

In django templates, choices will be showing like this. That will return the readable value for the field,

{{ p.get_sizes_display }}.

Vote up, if this one helps you !!!

Answer 3

For every field that has choices set, the object will have a get_FOO_display() method, where FOO is the name of the field. This method returns the “human-readable” value of the field. so try:

{{p.get_sizes_display}}

for another example:

from django.db import models

class Person(models.Model):
    SHIRT_SIZES = (
        ('S', 'Small'),
        ('M', 'Medium'),
        ('L', 'Large'),
    )
    name = models.CharField(max_length=60)
    shirt_size = models.CharField(max_length=2, choices=SHIRT_SIZES)

we can access Small, Medium and Large in templates with (p as a Person):

{{p.get_shirt_size_display}}