Add post entity (#13)

Add post entity

backend/entities/post_entity.py

@@ -0,0 +1,47 @@
+'''User accounts for all registered users in the application.'''
+
+
+from sqlalchemy import Integer, String
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from typing import Self
+from .entity_base import EntityBase
+from .user_role_entity import user_role_table
+from ..models import User
+from ..models import Post
+
+
+__authors__ = ['Kris Jordan']
+__copyright__ = 'Copyright 2023'
+__license__ = 'MIT'
+
+
+class PostEntity(EntityBase):
+    __tablename__ = 'user'
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    content: Mapped[str] = mapped_column(String(64), nullable=False, default='')
+    user: Mapped[User] = mapped_column(User, nullable=False, default='')
+    votes: Mapped[list[User]]
+    timestamp: Mapped[str] = mapped_column(String(64), nullable=False, default='')
+
+    @classmethod
+    def from_model(cls, model: Post) -> Self:
+        return cls(
+            id=model.id,
+            content=model.content,
+            user=model.user,
+            votes=model.votes,
+            timestamp=model.timestamp,
+        )
+
+    def to_model(self) -> Post:
+        return Post(
+            id=self.id,
+            content=self.content,
+            user=self.user,
+            votes=self.votes,
+            timestamp=self.timestamp,
+        )
+
+    def update(self, model: Post) -> None:
+        self.content = model.content