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Common things in programing...

VIETNAM'S PHONE_REGEX

'^(0[3|5|7|8|9])+([0-9]{8})$'

VN BANKS

from django.utils.translation import gettext as _

list_bank_trans_vi = (
	(("ABB"), ("An Binh Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần An Bình")),
	(("ACB"), ("Asia Commercial Joint-stock Bank - Ngân hàng thương mại cổ phần Á châu")),
	(("AGRIBANK"), (
		"Vietnam Bank for Agriculture and Rural Development - Agribank - Ngân hàng nông nghiệp và phát triển nông thông Việt Nam")),
	(("BACABANK"), ("Bac A Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần Bắc Á")),
	(("BID"), (
		"Joint Stock Commercial Bank for Investment and Development of Vietnam - Ngân hàng thương mại cổ phần đầu tư và phát triển Việt Nam")),
	(("CTG"), (
		"Vietnam Joint-Stock Commercial Bank for Industry and Trade - Ngân hàng thương mại cổ phần công thương Việt Nam")),
	(("EIB"),
	 ("Vietnam Export Import Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần xuất nhập khẩu Việt Nam")),
	(("HDBANK"),
	 ("Ho Chi Minh City Development Joint Stock Commercial Bank - Ngân hàng thương mại cổ phần phát triển TP.HCM")),
	(("KLB"), ("Kien Long Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần Kiên Long")),
	(("LIENVIET"), ("Lien Viet Post Joint Stock Commercial Bank - Ngân hàng thương mại cổ phần bưu điện Liên Việt")),
	(("MBB"), ("Military Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần quân đội")),
	(("MSB"), ("Vietnam Maritime Commercial Stock Bank - Ngân hàng thương mại cổ phần hàng hải Việt Nam")),
	(("NAMA"), ("Nam A Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần Nam Á")),
	(("NCB"), ("National Citizen Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần quốc dân")),
	(("OCB"), (
		"Orient Commercial Joint Stock Bank-Ngan Hang Thuong Mai Co Phan Phuong Dong - Ngân hàng thương mại cổ phần Phương Đông")),
	(("PGBANK"),
	 ("Petrolimex Group Commercial Joint Stock Bank (The) - Ngân hàng thương mại cổ phần xăng dầu PETROLIMEX")),
	(("PVCOMBANK"), ("Vietnam Public Joint Stock Commercial Bank - Ngân hàng thương mại cổ phần đại chúng Việt Nam")),
	(("SCB"), ("Sai Gon Joint Stock Commercial Bank - Ngân hàng thương mại cổ phần Sài Gòn")),
	(("SEABANK"), ("Southeast Asia Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần Đông Nam Á")),
	(("SGB"), ("Saigon Bank for Industry and Trade - Ngân hàng thương mại cổ phần Sài Gòn công thương")),
	(("SHB"), ("Saigon - Hanoi Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần Sài Gòn - Hà Nội")),
	(("STB"),
	 ("Saigon Thuong Tin Commercial Joint-Stock Bank- SACOMBANK - Ngân hàng thương mại cổ phần Sài Gòn thương tín")),
	(("TCB"),
	 ("Vietnam Technological and Commercial Joint-Stock Bank - Ngân hàng thương mại cổ phần kỹ thương Việt Nam")),
	(("TPB"), ("Tien Phong Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần Tiên Phong")),
	(("VCB"), (
		"Joint Stock Commercial Bank for Foreign Trade of Vietnam- VIETCOMBANK - Ngân hàng thương mại cổ phần ngoại thương Việt Nam")),
	(("VIB"), ("VietNam International Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần quốc tế Việt Nam")),
	(("VIETABANK"), ("Vietnam Asia Commercial Joint - Ngân hàng thương mại cổ phần Việt Á")),
	(("VIETCAPITALBANK"), ("Viet Capital Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần Bản Việt")),
	(("VPB"), ("Vietnam Prosperity Joint Stock Commercial Bank - Ngân hàng thương mại cổ phần Việt Nam thịnh vượng")),
	(("VIETBANK"),
	 ("Vietnam Thuong Tin Commercial Joint Stock Bank - Ngân hàng thương mại cổ phần Việt Nam Thương Tín")),
)

vn_banks = (
	(("ABB"), _("An Binh Commercial Joint Stock Bank")),
	(("ACB"), _("Asia Commercial Joint-stock Bank")),
	(("AGRIBANK"), _("Vietnam Bank for Agriculture and Rural Development - Agribank")),
	(("BACABANK"), _("Bac A Commercial Joint Stock Bank")),
	(("BID"), _("Joint Stock Commercial Bank for Investment and Development of Vietnam")),
	(("CTG"), _("Vietnam Joint-Stock Commercial Bank for Industry and Trade")),
	(("EIB"), _("Vietnam Export Import Commercial Joint Stock Bank")),
	(("HDBANK"), _("Ho Chi Minh City Development Joint Stock Commercial Bank")),
	(("KLB"), _("Kien Long Commercial Joint Stock Bank")),
	(("LIENVIET"), _("Lien Viet Post Joint Stock Commercial Bank")),
	(("MBB"), _("Military Commercial Joint Stock Bank")),
	(("MSB"), _("Vietnam Maritime Commercial Stock Bank")),
	(("NAMA"), _("Nam A Commercial Joint Stock Bank")),
	(("NCB"), _("National Citizen Commercial Joint Stock Bank")),
	(("OCB"), _("Orient Commercial Joint Stock Bank-Ngan Hang Thuong Mai Co Phan Phuong Dong")),
	(("PGBANK"), _("Petrolimex Group Commercial Joint Stock Bank (The)")),
	(("PVCOMBANK"), _("Vietnam Public Joint Stock Commercial Bank")),
	(("SCB"), _("Sai Gon Joint Stock Commercial Bank")),
	(("SEABANK"), _("Southeast Asia Commercial Joint Stock Bank")),
	(("SGB"), _("Saigon Bank for Industry and Trade")),
	(("SHB"), _("Saigon - Hanoi Commercial Joint Stock Bank")),
	(("STB"), _("Saigon Thuong Tin Commercial Joint-Stock Bank- SACOMBANK")),
	(("TCB"), _("Vietnam Technological and Commercial Joint-Stock Bank")),
	(("TPB"), _("Tien Phong Commercial Joint Stock Bank")),
	(("VCB"), _("Joint Stock Commercial Bank for Foreign Trade of Vietnam- VIETCOMBANK")),
	(("VIB"), _("VietNam International Commercial Joint Stock Bank")),
	(("VIETABANK"), _("Vietnam Asia Commercial Joint")),
	(("VIETCAPITALBANK"), _("Viet Capital Commercial Joint Stock Bank")),
	(("VPB"), _("Vietnam Prosperity Joint Stock Commercial Bank")),
	(("VIETBANK"), _("Vietnam Thuong Tin Commercial Joint Stock Bank")),
)

VIETNAM E-WALLETS

wallet_vn = [
    "MoMo",
    "ViettelPay",
    "ZaloPay",
    "VTC Pay ",
    "Payoo ",
    "ShopeePay",
    "VNPay",
    "Moca",
    "Vimo",
    "VinID",
]

There are so many tool can help us to deploy application more easily.

Github-Action

ACT

https://github.com/nektos/act

Github-action does not support locally as gitlab-runner exec ... like this.

So this tool is play ground at the local.

Thus we can work around before publish with dirty empty commits 

git commit --allow-empty -m "Empty-Commit" && git push

That makes sense versioning control, team work.

act -g | l ...
act --help

Ship with input and var && env


#![allow(unused)]
fn main() {
println!("aaaa");
}

Jenkins

gitlab

Just in case ipv4 does not assign to container.
sudo firewall-cmd --zone=trusted --change-interface=lxdbr0 --permanent
sudo firewall-cmd --reload
Prevent conflict with Docker.
iptables -I DOCKER-USER -i <network_bridge> -o <external_interface> -j ACCEPT
iptables -I DOCKER-USER -o <network_bridge> -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
Docker inside LXC.
lxc storage create tower btrfs
lxc storage volume create tower docker
lxc config device add tower tower disk pool=tower source=docker path=/var/lib/docker
lxc config set tower security.nesting=true security.syscalls.intercept.mknod=true security.syscalls.intercept.setxattr=true
lxc restart tower

Rust

Pythonista

There are so many error caused by datetime. So I decided to write this article.

Determine exact date and time with timedelta
timedelta does not support year right?
that why we have to do more calculate
Let's use python built-in package calendar.

import calendar
from datetime import datetime

days = 366 if calendar.isleap(datetime.now().year) else 365

For some details: send email hapy birthday for next year, count down event day, billing stuff, etc... Everything works fine if this year not leap.
What if I send an email happy new year on the day at the end of the year before?

Python

All we understood this way help us keep away N+1 hit to the db, right?.

We have simple models here.

class Author(models.Model):
	name = models.CharField(max_length=255)

	class Meta:
		db_table = "author"

class Tag(models.Model):
	name = models.CharField(max_length=255)

	class Meta:
		db_table = "tag"

class Book(models.Model):
	name = models.CharField(max_length=255)
	author = models.ForeignKey(Author, on_delete=models.CASCADE)
	tag = models.ManyToManyField(Tag)

	class Meta:
		db_table = "book"

Now let's do some shell

Book.objects.select_related("author")

SELECT "book"."id",
       "book"."name",
       "book"."author_id",
       "author"."id",
       "author"."name"
  FROM "book"
 INNER JOIN "author"
    ON ("book"."author_id" = "author"."id")
 LIMIT 21

Execution time: 0.000162s [Database: default]

Book.objects.select_related("tag")

FieldError: Invalid field name(s) given in select_related: 'tag'. Choices are: author

Ooppppps

Even you try 

Tag.objects.select_related('book')

That's will give you the same error too.

For the select_related we can only use if the ForeignKey involves.

So next is interesting part

In [21]: Book.objects.prefetch_related("author")
Out[21]: 
SELECT "book"."id",
       "book"."name",
       "book"."author_id"
  FROM "book"
 LIMIT 21

Execution time: 0.000097s [Database: default]
SELECT "author"."id",
       "author"."name"
  FROM "author"
 WHERE "author"."id" IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)

And now for the tag

In [23]: Book.objects.prefetch_related("tag")
Out[23]: 
SELECT "book"."id",
       "book"."name",
       "book"."author_id"
  FROM "book"
 LIMIT 21

Execution time: 0.000102s [Database: default]
SELECT ("book_tag"."book_id") AS "_prefetch_related_val_book_id",
       "tag"."id",
       "tag"."name"
  FROM "tag"
 INNER JOIN "book_tag"
    ON ("tag"."id" = "book_tag"."tag_id")
 WHERE "book_tag"."book_id" IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)

Hee it's worked either one of them is not ManyToManyField. There is no sign of any error as select_related

But very very different statements as you can see and compare.

Wait what.. what is book_tag ? where do you come from?.

It's the table's name auto generated by django.

For the m2m relation we have to have a middle table to map both id's.

We can show the table in our db.

sqlite> 
SELECT 
    name
FROM 
    sqlite_schema
WHERE 
    type ='table' AND 
    name NOT LIKE 'django_%' AND 
    name NOT LIKE 'auth_%' AND 
    name NOT LIKE 'sqlite_%';
tag
book
book_tag
 
SELECT * FROM book_tag;

id  book_id  tag_id
--  -------  ------
1   1        2     
2   1        1     
4   1        3     
...

That's explained why we got unmatch statement.

We have to do more JOIN after get the tag's id, instead of go to destination as author does.

Interested part

But in the Tag's view. How do i get the books contains this tag?.

As we know the Tag connected to Book through book_tag right ?

Tag.objects.filter().prefetch_related('book')

AttributeError: Cannot find 'book' on Tag object, 'book' is an invalid parameter to prefetch_related()

Argggggggggggggggg that's why i expected more than 24hrs for a single day.

Go to the docs as a usual? No!.

In [35]: vars(Tag)
Out[35]: 
mappingproxy({'__module__': 'author.models',
              '__doc__': 'Tag(id, name)',
              '_meta': <Options for Tag>,
              'DoesNotExist': author.models.Tag.DoesNotExist,
              'MultipleObjectsReturned': author.models.Tag.MultipleObjectsReturned,
              'name': <django.db.models.query_utils.DeferredAttribute at 0x7ffa7c952260>,
              'id': <django.db.models.query_utils.DeferredAttribute at 0x7ffa7c952380>,
              'objects': <django.db.models.manager.ManagerDescriptor at 0x7ffa7c952320>,
              'book_set': <django.db.models.fields.related_descriptors.ManyToManyDescriptor at 0x7ffa7c953610>})

Did you see that book_set just apply it.

In [36]: Tag.objects.filter().prefetch_related('book_set')
Out[36]: SELECT "tag"."id",
       "tag"."name"
  FROM "tag"
 LIMIT 21

Execution time: 0.000046s [Database: default]
SELECT ("book_tag"."tag_id") AS "_prefetch_related_val_tag_id",
       "book"."id",
       "book"."name",
       "book"."author_id"
  FROM "book"
 INNER JOIN "book_tag"
    ON ("book"."id" = "book_tag"."book_id")
 WHERE "book_tag"."tag_id" IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
Now the hack is _set.

Just related_name at the Python object level, not relate to sql stuff. If you dont set, django will use it as default.

Now I added it. 

class Book(models.Model):
	name = models.CharField(max_length=255)
	author = models.ForeignKey(Author, on_delete=models.CASCADE)
	tag = models.ManyToManyField(Tag, related_name='book')

And check it again.

In [3]: vars(Tag)
Out[3]: 
mappingproxy({...
              'name': <django.db.models.query_utils.DeferredAttribute at 0x7fccd3436c20>,
              'id': <django.db.models.query_utils.DeferredAttribute at 0x7fccd3436d40>,
              'objects': <django.db.models.manager.ManagerDescriptor at 0x7fccd3436ce0>,
              'book': <django.db.models.fields.related_descriptors.ManyToManyDescriptor at 0x7fccd3436860>})


Tag.objects.filter().prefetch_related('book')
<QuerySet [...]>

Hooray it's work as I expected!

Now let's try with ForeignKey at the Author view

Author.objects.filter().prefetch_related('book_set')
<QuerySet [...]>

Works like a champ...

More salt?

If this Tag table have others relation than Book like a post, news, event, etc...

Ok let's do it.

i added new model below.

class Post(models.Model):
	name = models.CharField(max_length=255)
	content = models.TextField()
	tag = models.ManyToManyField(Tag)

	class Meta:
		db_table = "post"

Then run make/migrate.

In [7]: vars(Tag)
Out[7]: 
mappingproxy({...
              'objects': <django.db.models.manager.ManagerDescriptor at 0x7fccd3436ce0>,
              'book': <django.db.models.fields.related_descriptors.ManyToManyDescriptor at 0x7fccd3436860>,
              'post_set': <django.db.models.fields.related_descriptors.ManyToManyDescriptor at 0x7fccd3435d80>
})

Post.objects.filter().prefetch_related('book_set')
<QuerySet []>

Here it is!

1. SAME KIND.

Base models

# /product/models.py
from django.db import models


class Product(models.Model):
	name = models.CharField(max_length=255)


class Variant(models.Model):
	name = models.CharField(max_length=255)
	product = models.ForeignKey(Product, on_delete=models.CASCADE)
	price = models.PositiveIntegerField()

i got my app name is product and register in INSTALLED_APPS settings

price = models.PositiveIntegerField() need to be decimal
there are db schema having some primitive type: char, int, varchar... another.
But for all it's just number and text.
Just simply to change the type to DecimalField

class Variant(models.Model):
	name = models.CharField(max_length=255)
	product = models.ForeignKey(Product, on_delete=models.CASCADE)
	price = models.DecimalField(decimal_places=3, max_digits=999)

and then run make migration

python manage.py makemigrations product

# /product/migrations/0002_alter_variant_price.py
# Generated by Django 4.1.7 on 2023-02-23 22:35

from django.db import migrations, models


class Migration(migrations.Migration):

    dependencies = [
        ("product", "0001_initial"),
    ]

    operations = [
        migrations.AlterField(
            model_name="variant",
            name="price",
            field=models.DecimalField(decimal_places=3, max_digits=999),
        ),
    ]

Django will automate generate a new migration file base on our behavior as you can see above.
And then migrate it's 

python manage.py migrate product

Now just find where we implemented this field and do more change logic, syntax, etc...
Everything will work.

Well it's just a simple case, because it is the same type in general: NUMBER

2. NEW FIELD BASED ON EXISTED FIELD.

Now we do harder from int to datetime
I have a subscribes app like product above too.

# subscribe/models.py
class Subscriber(models.Model):
	email = models.EmailField()
	age = models.SmallIntegerField()

This model run so long ago and have a thousand records in it
For more logical and painful of code it's should be date of birth(DOB)
I have to migrate existed data to new type right?

class Subscriber(models.Model):
	email = models.EmailField()
	age = models.SmallIntegerField()
	dob = models.DateField()

Well just add a dob field and run make & migrate.

python manage.py makemigrations
It is impossible to add a non-nullable field 'dob' to subscriber without specifying a default. This is because the database needs something to populate existing rows.
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
 2) Quit and manually define a default value in models.py.
Select an option:

Ahhhh that it.
If i place null=True to attribute in the model's field that's will work perfectly within null value. But for what?

So now we have to do more calculate for it.
Make a fresh migrate app from django template.

python manage.py makemigrations subscribe --name convert_age_dob --empty

and the output

Migrations for 'subscribe':
  subscribe/migrations/0002_convert_age_dob.py

# subscribe/migrations/0002_convert_age_dob.py
# Generated by Django 4.1.7 on 2023-02-23 23:09

from django.db import migrations


class Migration(migrations.Migration):

    dependencies = [
        ("subscribe", "0001_initial"),
    ]

    operations = []

Here the battlefield
Need a function convert from age to DOB right ?

from django.utils import timezone

def age_to_dob(apps, schema_editor):
    Subscriber = apps.get_model('subscribe', 'Subscriber')
    today = timezone.now()
    for sub in Subscriber.objects.all():
        sub.dob = today.replace(year=today.year-sub.age)  # that too dirty but i'll fix it later
        sub.save()

and let operation run it

operations = [
        migrations.RunPython(age_to_dob, migrations.RunPython.noop),
]

migrations.RunPython.noop is the step backward if we revert the migration. so for do nothing i added noop

Now my completed migration file is:
# Generated by Django 4.1.7 on 2023-02-23 23:09

from django.db import migrations, models
from django.utils import timezone


def age_to_dob(apps, schema_editor):
    Subscriber = apps.get_model('subscribe', 'Subscriber')
    today = timezone.now()
    for sub in Subscriber.objects.all():
        sub.dob = today.replace(year=today.year-sub.age)  # that too dirty but i'll fix it later
        sub.save()


class Migration(migrations.Migration):

    dependencies = [
        ("subscribe", "0001_initial"),
    ]

    operations = [
        migrations.AddField(
            model_name='Subscriber',
            name='dob',
            field=models.DateField(null=True, default=None),
            preserve_default=False,
        ),
        
        migrations.RunPython(age_to_dob, migrations.RunPython.noop),

        migrations.AlterField(
            model_name='Subscriber',
            name='dob',
            field=models.DateField(),
            preserve_default=True,
        ),
    ]

well a little big rigt ?
we have migrations.AddField anf migrations.AlterField it's just the trick to bypass not-null value from django migrate schema. cuz we need this always having data
Otherwise, you will get the error django.db.utils.IntegrityError: NOT NULL constraint failed:...

and run migrate this file.

3. SAME FIELD AND DIFFERENT TYPE.

This is the hard part on refactor operation a projects.
Added new field and then copy data in to it will make many critical error on release and if we run in container we have to create lots of releases that's increment time and effort!

As all we know. django model have pk default for your record, it is a biginterger and have auto increment on the back.
Now if we expose this to the public like id of post or user id. This way is the door to invites crawler get my own data. Cuz it's predictable.
So it must be unpredictable, by using uuid or other algorythm to create identify instead.
I got my user model here

from django.contrib.auth.models import AbstractUser
from django.db import models


class User(AbstractUser):
	alias = models.CharField(max_length=255)
    ...

That run quite long ago and got a lot of users\ At this if we call .id or .pk will return int for each record.
And tons of code implemented before take time to refactor. Would you add more field like uuid and then go to fix, add, delete old logic ???
NOOOOOOOOOOOOOOO! imma lazy guy. And i impl like this.

import uuid
from django.contrib.auth.models import AbstractUser
from django.db import models


class User(AbstractUser):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    alias = models.CharField(max_length=255)
    ...

Then make a function generate new id inside of migration stage. make it.

user/migrations/0002_alter_user_id.py
# Generated by Django 4.1.7 on 2023-02-24 01:14

from django.db import migrations, models
import uuid


class Migration(migrations.Migration):

    dependencies = [
        ("user", "0001_initial"),
    ]

    operations = [
        migrations.AlterField(
            model_name="user",
            name="id",
            field=models.UUIDField(
                default=uuid.uuid4, editable=False, primary_key=True, serialize=False
            ),
        ),
    ]

Django generated it for me. but it just applies to new record which insert in the future. what should I do for existed id.

So i apply my flow here and run it without any error.

from django.db import migrations, models
import uuid


def create_uuid(apps, schema_editor):
    User = apps.get_model('user', 'User')
    for user in list(User.objects.all()):
        user.id = uuid.UUID(int=user.id)
        user.save()


class Migration(migrations.Migration):

    dependencies = [
        ("user", "0001_initial"),
    ]

    operations = [
        # add new one
        migrations.AddField(
            model_name='user',
            name='uuid',
            field=models.UUIDField(null=True),
        ),
        # seed new one
        migrations.RunPython(create_uuid, migrations.RunPython.noop),

        # change attributes
        migrations.AlterField(
            model_name='user',
            name='uuid',
            field=models.UUIDField(
                default=uuid.uuid4, editable=False, primary_key=True, serialize=False
            ),
        ),

        # remove old one
        migrations.RemoveField('User', 'id'),

        # rename to new
        migrations.RenameField(
            model_name='User',
            old_name='uuid',
            new_name='id'
        ),

        # Update attributes
        migrations.AlterField(
            model_name='user',
            name='id',
            field=models.UUIDField(
                primary_key=True, default=uuid.uuid4, serialize=False, editable=False
            ),
        ),
    ]

Celery

Snippet

Some necessarily need to be added to new project.

Don't have time find on the internet.

I'm too old to remember.

INIT.

gcl [email protected]:bboyadao/django_template.git proj_name \ 
&& cd proj_name  \
&& rm -rf .git
&& git init

poetry install

SETTINGS.


ALLOWED_HOSTS = ["*"]

AUTH_APPS = [
    "rest_framework_simplejwt.token_blacklist",
    "oauth2_provider",
    "rest_framework.authtoken",
    "dj_rest_auth",
    "dj_rest_auth.registration",
    "allauth",
    "allauth.account",
    "allauth.socialaccount",
    "allauth.socialaccount.providers.facebook",
    "allauth.socialaccount.providers.google",
]

DOCS_APPS = ["drf_spectacular",
             "drf_spectacular_sidecar"]

CELERY_APPS = ["django_celery_results",
               "django_celery_beat"]

LIB_APPS = ["rest_framework",
            "django_filters",
            "phonenumber_field",
            "corsheaders",
            "fcm_django",
            "actstream",
            ]

EXTERNAL_APPS = LIB_APPS + CELERY_APPS + AUTH_APPS + DOCS_APPS
INTERNAL_APPS = []
INSTALLED_APPS += EXTERNAL_APPS + INTERNAL_APPS