*Episode 16* PYTHON (Referencing Tags with a Many to Many Field of Django)

 

Referencing tags with a Many To Many field

This episode covers :-

 1) How to reference multiple items with many-to-many relationships.

•  Setup :-

Terminal

cp -fr 15-Base-Project 18-Tags-ManyToMany

cd 18-Tags-ManyToMany

source ../venv/bin/activate

•  Adding the tags field :-

     Edit myapp models.py file and add Tag model and tags field:

myapp/models.py

from django.db import models

class Tag(models.Model): # < here

title = models.CharField(max_length=255, default='')

def __str__(self):

return self.title

class Flower(models.Model):

title = models.CharField(max_length=255, default='')

description = models.TextField(default='')

tags = models.ManyToManyField(Tag) # < here

def __str__(self):

return self.title

     Edit myapp admin.py file and register the Tag model:

myapp/admin.py

from django.contrib import admin

from myapp.models import Flower, Tag # < here

admin.site.register(Flower)

admin.site.register(Tag) # < here

     Run migrations:

Terminal

python manage.py makemigrations

python manage.py migrate

      Edit a flower and add some tags. Make sure to select more than one tag:

•  Updating the homepage template :-

     Edit the myapp index.html template file and print out the tags:

myapp/templates/myapp/index.html

<div class="card">

...

<hr>

{% for tag in flower.tags.all %}

<a href="#" class="card-link">{{ tag }}</a>

{% endfor %}

</div>

Summary

•   ManyToMany relationship allows our flowers to reference many tags and the tags to reference many flowers.

👈Episode 15(P).                                                                           Episode 17(P)👉

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