Metadata-Version: 2.1
Name: alcherializer
Version: 0.5.0
Summary: Django like model serializer
Home-page: https://github.com/vinyguedess/alcherializer
Author: Vinicius Guedes
Author-email: viniciusgued@gmail.com
License: MIT
Download-URL: https://github.com/vinyguedess/alcherializer/archive/master.zip
Keywords: django,flask,serializer,sql,sqlalchemy,alchemy
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: Topic :: Software Development :: Build Tools
Classifier: License :: OSI Approved :: MIT License
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Description-Content-Type: text/markdown
Requires-Dist: SQLAlchemy (<=1.4.18,>=1.3.20)

[![Github Actions](https://github.com/vinyguedess/alcherializer/actions/workflows/main.yml/badge.svg)](https://github.com/vinyguedess/alcherializer/actions/workflows/main.yml)
[![Maintainability](https://api.codeclimate.com/v1/badges/332cfdc498df9f6dc272/maintainability)](https://codeclimate.com/github/vinyguedess/alcherializer/maintainability)
[![Test Coverage](https://api.codeclimate.com/v1/badges/332cfdc498df9f6dc272/test_coverage)](https://codeclimate.com/github/vinyguedess/alcherializer/test_coverage)

# Alcherializer
A "Django like" model serializer.

## Declaring Serializer
It's very simples to declare a serializer. Just like Django, the only
thing you need is to create a class with a Meta class inside and
a model attribute.

This instantly maps all fields declared in model.
```python
from datetime import datetime
from alcherializer import Serializer
import sqlalchemy
from sqlalchemy.orm import relationship


class Manager:
    name = sqlalchemy.Column(sqlalchemy.String(100))


class User:
    name = sqlalchemy.Column(sqlalchemy.String(100))
    age = sqlalchemy.Column(sqlalchemy.Integer)
    is_active = sqlalchemy.Column(sqlalchemy.Boolean)
    created_at = sqlalchemy.Column(sqlalchemy.DateTime, default=datetime.utcnow)

    organization = relationship(Manager, uselist=False)


class UserSerializer(Serializer):
    class Meta:
        model = User
```
PS: For further exemplifications we will always use **User** and **UserSerializer**.

## Data
Gets a dictionary of a single model.
```python
model = User(
    name="Clark Kent",
    age=31,
    is_active=True)

serializer = UserSerializer(model)
serializer.data  # { "name": "Clark Kent", ... }
```

Or, a list of models
```python
model = User(
    name="Clark Kent",
    age=31,
    is_active=True)

serializer = UserSerializer([model], many=True)
serializer.data  # [{ "name": "Clark Kent", ... }]
```

### Related Serializers
```python
class ManagerSerializer(Serializer):
    class Meta:
        model = Manager


class UserSerializer(Serializer):
    manager = ManagerSerializer()

    class Meta:
        model = User


model = User(
    name="Peter Parker",
    manager=Manager(
        name="J. Jonah Jameson"
    )
)
serializer = UserSerializer(model)
serializer.data # {"name": "Peter Parker", "manager": {"name": "J. Jonah Jameson"}}
```

### Custom fields
```python
from datetime import datetime, timedelta
from alcherializer import fields

class UserSerializer(Serializer):
    year_of_birth = fields.MethodField()

    def get_year_of_birth(self, user: User) -> datetime:
        return datetime.utcnow() - timedelta(days=user.age * 365)

    class Meta:
        model = User
        fields = ["id", "name", "year_of_birth"]


model = User(id=1, name="Batman", age=30)

serializer = UserSerializer(model)
serializer.data # {"id": 1, "name": "Batman", "year_of_birth": 1991}
```

## Validation
To validate a payload, it's possible to send it through data argument while
instantiating the serializer and call **.is_valid** method.
```python
serializer = UserSerializer(data={
    "name": "Clark Kent",
    "age": 31,
    "is_active": True
})
serializer.is_valid()  # True
```

### Fetching validation errors
If any error happens you can fetch the information through error attribute.
```python
serializer = UserSerializer(data={
    "name": "", # If ommitted or None should present error too
    "age": 31,
    "is_active": True
})
serializer.is_valid()  # False
serializer.errors # {"name": ["Can't be blank"]}
```

## Fields
This shows off how fields are mapped from SQLAlchemy models.

Model attribute | Alcherializer field | Validations
--- | --- |---
Boolean | BooleanField | <ul><li>[x] Required</li><li>[x] Valid boolean</li></ul>
BigInteger, Integer, SmallInteger | IntegerField | <ul><li>[x] Required</li></ul>
String, Text Unicode | StringField | <ul><li>[x] Required</li><li>[x] Max length</li></ul>


