First version

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# dotenv
+.env
+
+# virtualenv
+.venv
+venv/
+ENV/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+
+# PyCharm stuff
+.idea/

AppDesign.md

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+Entity - Course (start date, description, Tutor), 
+       - Webinar (date, description, Tutor)
+
+Users - Admin, Tutor (isTutor=True), Student (isTutor=False)		-> custom User model (of models.Model)
+
+Views - CourseListView, WebinarListView
+      - TutorView (list of courses Tutor assigned to, list of students and their progress), 
+      - StudentView (list of courses paid by Student and with access to, list of upcoming webinars)
+
+
+API access - read for all, write for admin only (could be logged in to /admin/ if API opened in browser)

catalog/admin.py

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+from django.contrib import admin
+
+from . import models
+
+admin.site.register(models.Tag)
+admin.site.register(models.Course)
+admin.site.register(models.Webinar)

catalog/apps.py

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+from django.apps import AppConfig
+
+
+class CatalogConfig(AppConfig):
+    name = 'catalog'

catalog/migrations/0001_initial.py

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+# Generated by Django 2.0.4 on 2018-04-22 20:43
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Course',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('title', models.CharField(max_length=200)),
+                ('description', models.TextField()),
+                ('start_date', models.DateField()),
+                ('duration', models.DurationField()),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Tag',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('title', models.CharField(max_length=50)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Webinar',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('title', models.CharField(max_length=200)),
+                ('description', models.TextField()),
+                ('scheduled_time', models.DateTimeField()),
+            ],
+        ),
+        migrations.AddField(
+            model_name='course',
+            name='tags',
+            field=models.ManyToManyField(blank=True, to='catalog.Tag'),
+        ),
+    ]

catalog/migrations/0002_auto_20180422_2043.py

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+# Generated by Django 2.0.4 on 2018-04-22 20:43
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('catalog', '0001_initial'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='course',
+            name='user',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='courses', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AddField(
+            model_name='course',
+            name='webinars',
+            field=models.ManyToManyField(blank=True, to='catalog.Webinar'),
+        ),
+    ]

catalog/models.py

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+from django.db import models
+from otus_site import settings
+
+
+class Tag(models.Model):
+    title = models.CharField(max_length=50)
+
+    def __str__(self):
+        return self.title
+
+
+class Course(models.Model):
+    user = models.ForeignKey(
+        settings.Base.AUTH_USER_MODEL,
+        related_name='courses',
+        on_delete=models.CASCADE)
+    title = models.CharField(max_length=200)
+    description = models.TextField()
+    start_date = models.DateField()
+    duration = models.DurationField()
+
+    tags = models.ManyToManyField('Tag', blank=True)
+    webinars = models.ManyToManyField('Webinar', blank=True)
+
+    def __str__(self):
+        return self.title
+
+
+class Webinar(models.Model):
+    title = models.CharField(max_length=200)
+    description = models.TextField()
+    scheduled_time = models.DateTimeField()
+
+    def __str__(self):
+        return self.title

catalog/serializers.py

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+from rest_framework import serializers
+from . import models
+
+
+class TagSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = models.Tag
+        fields = ('id', 'title')
+
+
+class CourseSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = models.Course
+        fields = ('id', 'user', 'title', 'description',
+                  'start_date', 'duration', 'tags', 'webinars')
+
+
+class WebinarSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = models.Webinar
+        fields = ('id', 'title', 'description', 'scheduled_time')

catalog/urls.py

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+from django.conf.urls import include, url
+from rest_framework import routers
+
+from . import views
+
+router = routers.DefaultRouter()
+router.register(r'tags', views.TagViewSet)
+router.register(r'courses', views.CourseViewSet)
+router.register(r'webinars', views.WebinarViewSet)
+
+app_name = 'catalog'
+urlpatterns = [
+    url(r'^', include(router.urls))
+]

catalog/views.py

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+from django.shortcuts import render
+
+from rest_framework import viewsets
+from otus_site import permissions
+
+from . import models, serializers
+
+
+class TagViewSet(viewsets.ModelViewSet):
+    queryset = models.Tag.objects.all()
+    serializer_class = serializers.TagSerializer
+    permission_classes = [permissions.IsAccountAdminOrReadOnly, ]
+
+
+class CourseViewSet(viewsets.ModelViewSet):
+    queryset = models.Course.objects.all()
+    serializer_class = serializers.CourseSerializer
+    permission_classes = [permissions.IsAccountAdminOrReadOnly, ]
+
+
+class WebinarViewSet(viewsets.ModelViewSet):
+    queryset = models.Webinar.objects.all()
+    serializer_class = serializers.WebinarSerializer
+    permission_classes = [permissions.IsAccountAdminOrReadOnly, ]

manage.py

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+#!/usr/bin/env python
+import os
+import sys
+
+
+if __name__ == "__main__":
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'otus_site.settings')
+    os.environ.setdefault('DJANGO_CONFIGURATION', 'Dev')
+
+    from configurations.management import execute_from_command_line
+
+    execute_from_command_line(sys.argv)

otus_site/permissions.py

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+from rest_framework import permissions
+
+
+class IsAccountAdminOrReadOnly(permissions.BasePermission):
+    """
+    Read-only requests are allowed for any users (both authorized and anonymous).
+    Write/Delete requests are allowed only to authorized Admin.
+    """
+
+    def has_permission(self, request, view):
+        return (
+            request.method in permissions.SAFE_METHODS or
+            request.user and
+            request.user.is_staff
+        )