Working on Django and Postgres-XL

Author: omidraha

ads/__init__.py

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+from django.contrib import admin
+
+# Register your models here.
+from ads.models import Company, Ads, Campaign
+
+
+@admin.register(Company)
+class CompanyAdmin(admin.ModelAdmin):
+    pass
+
+
+@admin.register(Campaign)
+class CampaignAdmin(admin.ModelAdmin):
+    pass
+
+
+@admin.register(Ads)
+class AdsAdmin(admin.ModelAdmin):
+    pass
+
+
+
+

ads/admin.py

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+from django.apps import AppConfig
+
+
+class AdsConfig(AppConfig):
+    name = 'ads'

ads/apps.py

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+# Generated by Django 2.1.4 on 2019-01-27 07:57
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Ads',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_created=True)),
+                ('name', models.CharField(max_length=512)),
+                ('clicks_count', models.IntegerField()),
+                ('updated_at', models.DateTimeField(auto_now_add=True)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Campaign',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_created=True)),
+                ('name', models.CharField(max_length=512)),
+                ('updated_at', models.DateTimeField(auto_now_add=True)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Click',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('clicked_at', models.DateTimeField(auto_created=True)),
+                ('ads', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='ads.Ads')),
+                ('campaign', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='ads.Campaign')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Company',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(auto_created=True)),
+                ('name', models.CharField(max_length=512)),
+                ('updated_at', models.DateTimeField(auto_now_add=True)),
+                ('users', models.ManyToManyField(to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+        migrations.AddField(
+            model_name='click',
+            name='company',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='ads.Company'),
+        ),
+        migrations.AddField(
+            model_name='campaign',
+            name='company',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='ads.Company'),
+        ),
+        migrations.AddField(
+            model_name='ads',
+            name='campaign',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='ads.Campaign'),
+        ),
+        migrations.AddField(
+            model_name='ads',
+            name='company',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='ads.Company'),
+        ),
+        migrations.AlterUniqueTogether(
+            name='click',
+            unique_together={('id', 'company')},
+        ),
+        migrations.AlterUniqueTogether(
+            name='campaign',
+            unique_together={('id', 'company')},
+        ),
+        migrations.AlterUniqueTogether(
+            name='ads',
+            unique_together={('id', 'company')},
+        ),
+    ]

ads/migrations/0001_initial.py

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+# Generated by Django 2.1.4 on 2019-01-23 14:26
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ads', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RunSQL(
+            "ALTER TABLE public.ads_company DISTRIBUTE BY HASH(id);"
+        ),
+    ]

ads/migrations/0002_auto_20190123_1426.py

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+# Generated by Django 2.1.4 on 2019-01-23 14:26
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('ads', '0002_auto_20190123_1426'),
+    ]
+
+    operations = [
+
+        # Django considers "id" the primary key of these tables, but
+        # Postgres-XL want the primary key to be (company_id, id)
+        migrations.RunSQL("""
+      ALTER TABLE ads_campaign
+      DROP CONSTRAINT ads_campaign_pkey CASCADE;
+
+      ALTER TABLE ads_campaign
+      ADD CONSTRAINT ads_campaign_pkey
+      PRIMARY KEY (company_id, id)
+    """),
+
+        migrations.RunSQL("""
+      ALTER TABLE ads_ads
+      DROP CONSTRAINT ads_ads_pkey CASCADE;
+
+      ALTER TABLE ads_ads
+      ADD CONSTRAINT ads_ads_pkey
+      PRIMARY KEY (company_id, id)
+    """),
+
+        migrations.RunSQL(
+            "ALTER TABLE public.ads_campaign DISTRIBUTE BY HASH(company_id);"
+        ),
+
+        migrations.RunSQL(
+            "ALTER TABLE public.ads_ads DISTRIBUTE BY HASH(company_id);"
+        ),
+    ]

ads/migrations/0003_auto_20190123_1426.py

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+from django.contrib.auth.models import User
+from django.db import models
+
+
+# Create your models here.
+
+
+class Company(models.Model):
+    """
+        Distributed on id
+    """
+    name = models.CharField(max_length=512)
+    users = models.ManyToManyField(User)
+    created_at = models.DateTimeField(auto_created=True)
+    updated_at = models.DateTimeField(auto_now_add=True)
+
+    def __str__(self):
+        return self.name
+
+
+class Campaign(models.Model):
+    """
+        Distributed on (id, company)
+    """
+
+    class Meta:
+        unique_together = (('id', 'company'),)
+
+    name = models.CharField(max_length=512)
+    company = models.ForeignKey(Company, on_delete=models.CASCADE)
+    created_at = models.DateTimeField(auto_created=True)
+    updated_at = models.DateTimeField(auto_now_add=True)
+
+    def __str__(self):
+        return self.name
+
+
+class Ads(models.Model):
+    """
+        Distributed on (id, company)
+    """
+
+    class Meta:
+        unique_together = (('id', 'company'),)
+
+    name = models.CharField(max_length=512)
+    company = models.ForeignKey(Company, on_delete=models.CASCADE)
+    campaign = models.ForeignKey(Campaign, on_delete=models.CASCADE)
+    clicks_count = models.IntegerField()
+    created_at = models.DateTimeField(auto_created=True)
+    updated_at = models.DateTimeField(auto_now_add=True)
+
+    def __str__(self):
+        return self.name
+
+
+class Click(models.Model):
+    class Meta:
+        unique_together = (('id', 'company'),)
+
+    ads = models.ForeignKey(Ads, on_delete=models.CASCADE)
+    company = models.ForeignKey(Company, on_delete=models.CASCADE)
+    campaign = models.ForeignKey(Campaign, on_delete=models.CASCADE)
+    clicked_at = models.DateTimeField(auto_created=True)

ads/migrations/__init__.py

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+from django.test import TestCase
+
+# Create your tests here.

ads/models.py

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+from django.shortcuts import render
+
+# Create your views here.

ads/tests.py

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+"""
+Django settings for dj_psxl_exp project.
+
+Generated by 'django-admin startproject' using Django 2.1.4.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/2.1/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/2.1/ref/settings/
+"""
+
+import os
+
+# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/2.1/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = 'qeprnfr&h63t9$gxqd+8vz&fu8p#tlq71o&!t$2y2g703_rc@r'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = []
+
+# Application definition
+
+INSTALLED_APPS = [
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+    'ads',
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'dj_psxl_exp.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [],
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'dj_psxl_exp.wsgi.application'
+
+# Database
+# https://docs.djangoproject.com/en/2.1/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.postgresql_psycopg2',
+        'HOST': os.environ.get('DATABASES_HOST', '192.168.0.142'),
+        'PORT': os.environ.get('DATABASES_PORT', 30002),
+        'NAME': os.environ.get('DATABASES_NAME', 'test'),
+        'USER': os.environ.get('DATABASES_USER', 'postgres'),
+        'PASSWORD': os.environ.get('DATABASES_PASSWORD', 'postgres'),
+        'DISABLE_SERVER_SIDE_CURSORS': True,
+    }
+}
+
+# Password validation
+# https://docs.djangoproject.com/en/2.1/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+# Internationalization
+# https://docs.djangoproject.com/en/2.1/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'UTC'
+
+USE_I18N = True
+
+USE_L10N = True
+
+USE_TZ = True
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/2.1/howto/static-files/
+
+STATIC_URL = '/static/'
+
+
+# @note: Patch to define default creation tables as replication
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
+BaseDatabaseSchemaEditor.sql_create_table = "CREATE TABLE %(table)s (%(definition)s) DISTRIBUTE BY REPLICATION"

ads/views.py

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+"""dj_psxl_exp URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/2.1/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+from django.contrib import admin
+from django.urls import path
+
+urlpatterns = [
+    path('admin/', admin.site.urls),
+]