08 November 2020
by
Jan Vorčák's profile photo, Webscope.io
Ján Vorčák

Slack Tutorial Part 3 - Creating backend's business logic

Slack
In order to interact with Slack, we need to quickly build some business logic. Luckily, that is super easy with Django. We will generate some entities using Django models, and provide an admin interface so that we can create & modify them. One of the reasons I've chosen Django for this tutorial is that we can do this without building a custom UIs.
Our application will allow users to log in and report hours on their projects. They'll also be able to see other user's reports. Simple as that.
We will:
1) Create Project model that will hold information about a project 2) ProjectReport model that will be used to report hours for each project

Create reports models

  1. pipenv run ./manage.py startapp projects
  2. Add projects string to INSTALLED_APPS in your settings.py
  3. Create Project and ProjectReport model
projects/models.py
from django.contrib.auth import get_user_modelfrom django.db import modelsUser = get_user_model()class Project(models.Model):    name = models.CharField(max_length=255)    logo = models.ImageField(null=True, blank=True)    def __str__(self):        return self.nameclass ProjectReport(models.Model):    project = models.ForeignKey(Project, on_delete=models.CASCADE)    description = models.TextField()    hours = models.FloatField()    # if we delete a user we don't want to loose the reported hours    user = models.ForeignKey(User, on_delete=models.PROTECT)    def __str__(self):        return f"{self.project.name} - {self.hours} hours - {self.user.username}"
and add them to admin interface
projects/admin.py
from django.contrib import adminfrom .models import Project, ProjectReportadmin.site.register(Project)admin.site.register(ProjectReport)
  1. pipenv install Pillow
We need to do this, because we've added an ImageField..
  1. pipenv run ./manage.py makemigrations && pipenv run ./manage.py migrate
git push deploy master from Heroku.
🎉 You can now check our models in the admin interface.
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