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model.py

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+from flask_sqlalchemy import SQLAlchemy
+
+db = SQLAlchemy()
+
+
+class Post(db.Model):
+    __tablename__ = "posts"
+    id = db.Column(db.Integer, primary_key=True)
+    priority = db.Column(db.Integer, unique=True, nullable=False)
+
+    category_id = db.Column(db.Integer, db.ForeignKey("category.id"), nullable=True)
+    category = db.relationship("Category", lazy=True)
+
+    title = db.Column(db.String(80), nullable=False)
+    intro = db.Column(db.Text, nullable=False)
+    description = db.Column(db.Text, nullable=True)
+
+    images = db.relationship("Image", backref="post", lazy=True)
+
+    @property
+    def serialize(self):
+        return {"id": self.id,
+                "priority": self.priority,
+                "category_id": self.category_id,
+                "category": self.category.name,
+                "title": self.title,
+                "intro": self.intro,
+                "description": self.description,
+                "images": self.images}
+
+    @staticmethod
+    def get_posts():
+        return Post.query.order_by(Post.priority).all()
+
+    @staticmethod
+    def get_posts_with_category(category_id):
+        return Post.query.filter(Post.category_id == category_id).order_by(Post.priority).all()
+
+
+class Image(db.Model):
+    __tablename__ = "images"
+    id = db.Column(db.Integer, primary_key=True)
+    uri = db.Column(db.String(80), nullable=False)
+    post_id = db.Column(db.Integer, db.ForeignKey("posts.id"), nullable=False)
+
+
+class Category(db.Model):
+    __tablename__ = "category"
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(80), nullable=False)