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Python

Posted by csj
csj
12,678 Points

[Django] Please help explain what it is I'm not getting with query/views/models

I have an app called projects with 3 html templates.

  1. project_list.html
  2. project_detail.html
  3. map.html

the models.py:

from django.db import models


class Project(models.Model):
    title = models.CharField(max_length=200)
    text = models.TextField()
    date = models.DateField()
    featured_image = models.ImageField(
        upload_to='projects/featured', default=False)

    def __str__(self):
        return self.title


class ProjectImage(models.Model):
    project = models.ForeignKey(Project, related_name='images')
    image = models.ImageField(upload_to='projects')


class MapData(models.Model):
    map_data = models.ForeignKey(Project)
    longitude = models.DecimalField(
        max_digits=10, decimal_places=8, default=False)
    latitude = models.DecimalField(
        max_digits=10, decimal_places=8, default=False)
    location = models.CharField(max_length=200, blank=True)

with the views.py:

from django.shortcuts import render
from django.views.generic.base import TemplateView
from django.views.generic import ListView, DetailView

from .models import Project
from .models import ProjectImage
from .models import MapData


class ProjectListView(ListView):
    model = Project


class ProjectDetailView(DetailView):
    model = Project


class MapDataView(TemplateView):
    model = MapData

    template_name = "projects/map.html"

And in my /projects/templates/project_list.html template I can access the Project class like so:

{% for project in project_list %}
    {{ project.title }}
{% endfor %}

But in my /projects/templates/map.html I can't do it. I can't access Project or MapData class like above. How can that be? Have I made a mistake with the MapDataView in views.py?

1 Answer

jacinator
jacinator
11,936 Points

A TemplateView does not require a model attribute to be defined. With what you have I would think that you want to use the DetailView for MapDataView. You can still give it the template_name that you have defined it MapDataView. A TemplateView only renders the template with a context of whatever kwargs are passed into the view.

See these pages for a good summary of TemplateViews and DetailViews. I use them all the time.

https://ccbv.co.uk/projects/Django/1.10/django.views.generic.base/TemplateView/ https://ccbv.co.uk/projects/Django/1.10/django.views.generic.detail/DetailView/

The other thing to note is that you can import TemplateView through django.views.generic. You don't have to use django.views.generic.base.

csj
csj
12,678 Points

@jacinator

Thank you very much for taking the time to give this answer. It was most helpful. I will see if I can make it work.