Django can't save new instance to model - django

Question

I cannot save the data taken from the form to database. The form is displayed properly and it seems that I can submit. Whenever I was redirected to "project_list.html", I cannot see the new project.
I also checked the admin site to whether new instance is saved to model but it seems that something is wrong with my code.
Here is my files:
model.py
class Project(models.Model):
project_id = models.CharField(max_length=30)
project_name = models.CharField(max_length=100)
view.py
def projects_list(request):
projects = Project.objects.all()
table = ProjectTable(Project.objects.all())
RequestConfig(request, paginate={'per_page':25}).configure(table)
return render(request, 'portal/project/list.html', {'projects':
projects, 'table': table})
def project_add(request):
if request.method == 'POST':
form = ProjectAddForm(request.POST)
if form.is_valid():
form.save()
return redirect('project_list',)
else:
form = ProjectAddForm()
return render(request, 'portal/project/add.html', {'form': form})
forms.py
from django import forms
from .models import Project
class ProjectAddForm(forms.ModelForm):
class Meta:
model = Project
fields = ['project_id', 'project_name',]
add.html
{% extends 'portal/base.html' %}
{% block title %}Add Project{% endblock title %}
{% block content %}
<div class="col-sm-10 offset-sm-1 text-center">
<form action="{% url 'portal:projects_list' %}" method="POST">
{% csrf_token %}
{{ form.as_p }}
<input type="submit" value="Submit">
</form>
</div>
{% endblock content %}
projects_list.html
{% extends 'portal/base.html' %}
{% load render_table from django_tables2 %}
{% block content %}
<h1>Projects List</h1>
{% render_table table %}
{% endblock content %}
urls.py
from django.urls import path
from . import views
app_name = 'portal'
urlpatterns = [
path('', views.homepage, name='homepage'),
path('password_generator/', views.password_generator,
name='password_generator'),
path('projects_list/', views.projects_list, name='projects_list'),
path('project/<str:project_id>/', views.project_detail,
name='project_detail'),
path('add/', views.project_add, name='project_add'),
]

Answer 1

I found the issue in my code. In my project_add view, I was trying to redirect to "project_list" url but it didnt exists. That was the mistake....