initial commit

.gitignore

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+__pycache__
+.vscode

pyproject.toml

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+[tool.poetry]
+name = "python-ddd"
+version = "0.1.0"
+description = ""
+authors = ["Przemysław Górecki <[email protected]>"]
+
+[tool.poetry.dependencies]
+python = "^3.9"
+pytest = "^6.2.4"
+pydantic = "^1.8.2"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"

src/modules/README.md

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+This directory contains all modules related to bounded contexts.

src/modules/listing/domain/entities.py

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+from seedwork.domain.entities import Entity
+
+
+class AuctionItem(Entity):
+    pass

src/modules/listing/domain/events.py

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+from seedwork.domain.events import DomainEvent
+
+
+class DraftCreatedEvent(DomainEvent):
+    pass
+
+

src/modules/listing/domain/rules.py

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+from seedwork.domain.rules import BusinessRule
+from seedwork.domain.value_objects import Currency
+
+class AuctionItemPriceMustBeGreaterThanZero(BusinessRule):
+    message = "Price must be greater that zero"
+    price: Currency
+
+    def is_broken(self) -> bool:
+        return self.price <= 0

src/modules/listing/tests/domain/test_rules.py

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+from modules.listing.domain.rules import AuctionItemPriceMustBeGreaterThanZero
+
+
+def test_AuctionItemPriceMustBeGreaterThanZero_rule():
+    rule = AuctionItemPriceMustBeGreaterThanZero(price=1)
+    assert not rule.is_broken()
+
+
+def test_AuctionItemPriceMustBeGreaterThanZero_rule_is_broken():
+    rule = AuctionItemPriceMustBeGreaterThanZero(price=0)
+    assert rule.is_broken()

src/seedwork/README.md

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+A **framework** is supposed to be a part-baked application that you extend in controlled ways to provide what you need. A **seedwork** is some minimal functionality that you modify however you like to get what you need. Of course this means that there's no way for you to get common updates to the seedwork, once you grow it you own it. 
+
+
+References:
+
+- https://martinfowler.com/bliki/Seedwork.html

src/seedwork/application/command.py

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+from pydantic import BaseModel
+
+
+class Command(BaseModel):
+    pass

src/seedwork/domain/entities.py

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+class Entity:
+    pass

src/seedwork/domain/events.py

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+from pydantic import BaseModel
+
+
+class DomainEvent(BaseModel):
+    pass

src/seedwork/domain/exceptions.py

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+class DomainException(Exception):
+    pass
+
+
+class BusinessRuleValidationException(DomainException):
+    pass

src/seedwork/domain/rules.py

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+from pydantic import BaseModel
+
+
+class BusinessRule(BaseModel):
+    message: str = "This is an error message for broken business rule"
+
+    def get_message(self) -> str:
+        return self.message
+
+    def is_broken(self) -> bool:
+        pass

src/seedwork/domain/value_objects.py

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+class Currency(int):
+    pass

src/seedwork/infrastructure/repository.py

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+class Repository:
+    pass