Django filter - function based views

1. urls

path('', views.HomeView, name='home'),

2. filters.py

import django_filters
from django_filters import DateFilter
from .models import Tutorial
from django import forms


class TutorialFilter(django_filters.FilterSet):
    DATE_CHOICES        = (
                            ('newest', 'Newest'),
                            ('oldest', 'Oldest')
    )
    date_sort           = django_filters.ChoiceFilter(
                            label     ='Sort by Date ',
                            choices   =DATE_CHOICES,
                            method    ='filter_by_date',
                            # widget  =forms.Select(attrs={'size': 4})
    )


    class Meta:
        model = Tutorial
        fields = {
                            'title'     : ['icontains'],
                            'instructor': ['icontains'],
                            'language'  : ['exact'],
                            'difficulty': ['exact'],
        }


    def filter_by_date(self, queryset, name, value):
        expression = 'last_updated' if value == 'oldest' else '-last_updated'
        return queryset.order_by(expression)

3. views

from .filters import TutorialFilter

def HomeView(request):
    tutorials = Tutorial.objects.all()
    # tutorial = tutorials.tutoriallist_set.all() parent child relationship case
    
    myFilter = TutorialFilter(request.GET, queryset=tutorials)
    tutorials = myFilter.qs

    return render(request, 'index.html', {'tutorials': tutorials, 'myFilter': myFilter})

4. templates

index.html

context passed

{% for item in tutorials %}

a href="{{ item.get_add_to_curriculum_url }}"

a href="{% url 'hub:tutorial_detail' item.pk %}">{{item.title}}</a>
{{item.instructor}}

{% for tag in item.tags.all %}
{{ tag }}
{% endfor %}

{{item.last_updated}}
{{item.difficulty}}
{{item.language}}
{{item.duration}}

{% endfor %}

manytomany

tags are manytomany relationship with curriculum (=item)

Note that when loop through it, '.all' needed.

{% for tag in item.tags.all %}
{{ tag }}
{% endfor %}

source code

 <!--Filter-->
                <div class="card card-body filter-bar">

                  <form method="get">

                    <div class="row justify-content-md-center">

                    <div class="col-sm-2 form-group is-valid">
                        <label for="id_title__icontains">by Title</label>
                        <input type="text" name="title__icontains" class="form-control is-valid" placeholder="search" title="" id="id_title__icontains">
                    </div>

                    <div class="col-sm-2 form-group is-valid">
                        <label for="id_instructor__icontains">by Instructor</label>
                        <input type="text" name="instructor__icontains" class="form-control is-valid" placeholder="search" title="" id="id_instructor__icontains">
                    </div>

                    <div class="col-sm-2 form-group is-valid"><label for="id_language">Language</label>
                        <select name="language" class="language form-control is-valid" title="" id="id_language">
                        <option value="" selected> select </option>
                        <option value="Korean">Korean</option>
                        <option value="English">English</option>
                        </select>
                    </div>

                    <div class="col-sm-2 form-group is-valid">
                        <label for="id_difficulty"Choose Difficulty> Difficulty </label>
                        <select name="difficulty" class="difficulty form-control is-valid" title="" id="id_difficulty">
                        <option value="" selected >select</option>
                        <option value="Beginner">Beginner</option>
                        <option value="Intermediate">Intermediate</option>
                        <option value="Advanced">Advanced</option>
                        </select>
                    </div>

                    <div class="col-sm-2 form-group is-valid">
                        <label for="id_date_sort">Sort by Date </label>
                        <select name="date_sort" class="sortbydate form-control form-control-sm is-valid" placeholder="1234" title="" id="id_date_sort">
                        <option value="" selected> Newest to Oldest </option>
                        <option value="newest">Newest</option>
                        <option value="oldest" >Oldest</option>
                        </select>
                    </div>

                      <div class="col-sm-1 form-group is-valid" style="padding-left: 0.2px;">
                        <button class="btn btn-warning btn-md search_btn search_btn filter-btn" type="submit"> Search </button>
                      </div>


                      <div class="col-sm-1 form-group is-valid">
                      <a class="btn btn-secondary btn-md reset-btn filter-btn" href="{% url 'hub:home'%}" role="button">Reset</a>
                      </div>

                    </div>
                  </form>
                </div>
    <!-- filter -->