Description

Supported Patterns:

• Repository
• Chain of Responsibility

Repository

First implements the repository class this code takes on that a entity is the model of django. The class RepositoryBase on contains shortcuts. The philosophy behind is to create a repository.py file to save business logic. Like app this:

/product
    __init__.py
    views.py
    models.py
    repository.py <- implement yout logic here
    ...

Exemple of repository.py

from djpatterns.repository import RepositoryBase
from .models import YourModel

class ProductRepository(RepositoryBase):

    class Meta:
        model = YourModel

Fine, you now can access shortcuts of repository All method:

ProductRepository.all()
#returns all model

Get method:

ProductRepository.get(pk=1)
#returns model 

Filter method:

ProductRepository.filter(name__startswith='guitar')
#returns QuerySet

Exemple of bussiness logic in the repository class like this in the repository.py:

class ProductRepository(RepositoryBase):

    class Meta:
        model = Product

    @classmethod
    def buy_product(cls,pk):
        product = cls.get(pk=pk)
        #have in stock
        if product.amount > 0:
            product.amount -= 1
            product.save()
            return 'Sold :)'
        else:
            raise Exception('Out of stock :(')

One time logic implemented in you view.py only call the method :

from product.repository import ProductRepository

# Create your views here.
class SellProduct(generic.View):

    def get(self,request,pk):
        try:
            rs = ProductRepository.buy_product(pk)
            return HttpResponse(rs)
        except Exception as e:
            return HttpResponse(str(e))