✨ Add domain

app/domain/models.py

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+from dataclasses import dataclass
+from typing import NewType
+from uuid import UUID
+
+
+ParameterId = NewType("ParameterId", UUID)
+FormId = NewType("FormId", UUID)
+FormPopulationId = NewType("FormPopulationId", UUID)
+UserId = NewType("UserId", str)
+
+
+@dataclass
+class _BaseParameter:
+    field: str
+    answer: str
+
+@dataclass
+class UnidentificatedParameter(_BaseParameter):
+    ...
+
+@dataclass
+class IdentificatedParameter(_BaseParameter):
+    id: ParameterId
+
+type Parameter = UnidentificatedParameter | IdentificatedParameter
+
+
+@dataclass
+class _BaseFormPopulation:
+    user_id: UserId
+    form_id: FormId
+    parameters: list[Parameter]
+
+@dataclass
+class UnidentificatedFormPopulation(_BaseFormPopulation):
+    ...
+
+@dataclass
+class IdentificatedFormPopulation(_BaseFormPopulation):
+    id: FormPopulationId
+
+type FormPopulation = UnidentificatedFormPopulation | IdentificatedFormPopulation

app/domain/services.py

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+import typing
+
+from .models import (
+    FormPopulation,
+    UnidentificatedFormPopulation,
+    Parameter,
+    UnidentificatedParameter,
+    UserId,
+    FormId,
+)
+
+
+_sentinel: typing.Any = object()
+
+
+class FormPopulationService:
+    @staticmethod
+    def create(
+        user_id: UserId, form_id: FormId, parameters: list[Parameter] = []
+    ) -> FormPopulation:
+        return UnidentificatedFormPopulation(
+            user_id=user_id,
+            form_id=form_id,
+            parameters=parameters,
+        )
+
+    @staticmethod
+    def add_parameter(form_population: FormPopulation, parameter: Parameter) -> None:
+        form_population.parameters.append(parameter)
+
+
+class ParameterService:
+    @staticmethod
+    def create(field: str, answer: str) -> Parameter:
+        return UnidentificatedParameter(field=field, answer=answer)
+
+    @staticmethod
+    def update(
+        parameter: Parameter,
+        new_field: str = _sentinel,
+        new_answer: str = _sentinel,
+    ) -> None:
+        if new_field is not _sentinel:
+            parameter.field = new_field
+
+        if new_answer is not _sentinel:
+            parameter.answer = new_answer