CODEWITHSUNDEEP
pythondjango
ytsejam
ytsejam

Reputation: 3429

How to filter BooleanField in template in Django?

I am preparing a image gallery for my website using Django . I have basically a Gallery Model Foreign Key in my Image Model. I have a BooleanField in my Image model to make a cover photo.

What I need is to get True value for the one in between images. 

{% for gallery in gallery_list %}
 <div class="grid-item {{ choices | random }}">
  <a href="#" data-background="{{gallery.images}}#howtofilter?#" data-rel="lightcase:gal" title="Image Caption"></a>
   </div>
{% endfor %}

I checked the documents for custom filters trying to solve but I could not figure out. Can you help me ?

Thanks

Ps Edit: adding my models 

    class Gallery(models.Model):
        title = models.CharField(max_length=200,verbose_name=_("gallery_title"),help_text _("Enter the Gallery title"))

    class Image(models.Model):
        title = models.CharField(max_length=200,verbose_name=_("image_title"),help_text _("Enter the Image title"))
        gallery = models.ManyToManyField(Gallery)
        is_cover_photo = models.BooleanField()

Upvotes: 1

Views: 443

Answers (2)

Gavin Clark
Gavin Clark

Reputation: 299

It's good to keep complex logic like this outside of your templates to avoid them getting too complicated. Save it for the views and/or models!

Sounds like the best bet here would be to have a method on your Gallery model to get the Image that has the cover image. Something like:

class Gallery
    ...model fields...

    def get_cover_image(self):
         return self.images_set.filter(cover_photo=True).first()

Then in your template, assuming the Image model has a property like url:

{% for gallery in gallery_list %}
  <div class="grid-item {{ choices | random }}">
    <a href="#" data-background="{{gallery.get_cover_image.url}}" data-rel="lightcase:gal" title="Image Caption"></a>
  </div>
{% endfor %}

To save lots of DB queries here you might need/want to use prefetch_related to get all the Image objects you'll need to display the galleries, but that's a different question.

Upvotes: 1

Aamir Rind
Aamir Rind

Reputation: 39659

You could write a method in Gallery model to return you a cover image:

class Gallery(models.Model):
    # other fields
    def cover_image(self):
        return self.image_set.filter(is_cover_photo=True).first()

Then in template:

{% for gallery in gallery_list %}
    {% with cover=gallery.cover_image %}
        {% if cover %}
            {# do something with cover image #}
        {% endif %}
    {% endwith %}
{% endfor %}

Upvotes: 1

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