noseiquela-orm 0.0.8.dev1

No SeiQueLa ORM

IN DEVELOPMENT

🇧🇷 Documentação em Português

No SeiQueLa is a small and expressive ORM (Object Relational Mapper) to interact with Google Datastore inspired by Django, Mongo-Engine and Peewee.

Requirements

• Google Cloud credentials
• Python>=3.8

Installing

The library can be installed using pip:

pip install noseiquela_orm

Usage

Creating model classes:

from noseiquela_orm.entity import Model
from noseiquela_orm.key import Key, ParentKey
from noseiquela_orm import properties


class Customer(Model):
    name = properties.StringProperty(required=True)
    age = properties.IntegerProperty(required=True)
    is_deleted = properties.BooleanProperty(default=False, required=True)


class CustomerAddress(Model):
    __kind__ = "Address"
    __parent__ = properties.ParentKey(Customer, required=True)

    number = properties.IntegerProperty(required=True)
    address_one = properties.StringProperty(required=True)
    address_two = properties.StringProperty()
    is_default = properties.BooleanProperty(required=True)
    is_deleted = properties.BooleanProperty(default=False, required=True)

In case the project name, namespace (or any other parameter of the google.cloud.datastore.Client) needs to be changed, simply create a Meta class inside the template with the desired information.

class Product(Model):
    quantity = properties.IntegerProperty(required=True)
    name = properties.StringProperty(required=True)
    value = properties.FloatProperty(required=True)

    class Meta:
        namespace = "production"
        project = "products"

Adding new entities:

new_customer = Customer(
    name="Geraldo Castro",
    age=29,
)

new_customer.save()

new_address = CustomerAddress(
    parent_id=new_customer.id,
    number=199,
    address_one="Some St.",
    is_default=True
)

new_address.save()

Query on database:

customer = Customer.query.filter(name="Geraldo Castro").first()
customer_address = Customer.query.filter(parend_id=customer.id)

less_than_or_eq_29 = Customer.query.filter(age__le=29) # age <= 29
more_than_30 = Customer.query.filter(age__gt=30) # age > 30

all_customers = [
    customer.to_dict()
    for customer in Customer.query.all()
]

Authentication

The library uses the standard way of authenticating Google libraries (google-auth-library-python).

The search for credentials happens in the following order:

1. If the environment variable GOOGLE_APPLICATION_CREDENTIALS is set to a valid service account path.

2. If the Google Cloud SDK is installed and has the credentials of the application to be used, these will be loaded.

3. If the application is running in the App Engine standard environment (first generation), then the credentials and project ID are taken from the App Identity Service.

4. If the application is running in Compute Engine, Cloud Run, App Engine flexible environment or App Engine standard environment (second generation), then the credentials and project ID are taken from the Metadata Service.

More details at this link.