117 lines
3.4 KiB
Python
117 lines
3.4 KiB
Python
from typing import Dict, Optional, Union, Any
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from decimal import Decimal
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from sqlalchemy.orm import Session
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from fastapi import HTTPException
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from models.product import Product
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from schemas.product import ProductCreate
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def validate_product_data(product_data: ProductCreate) -> bool:
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"""
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Validate product data before creation.
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Args:
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product_data: Product data to validate
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Returns:
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bool: True if data is valid, False otherwise
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"""
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if not product_data.name or len(product_data.name.strip()) == 0:
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return False
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if not product_data.price or product_data.price <= Decimal('0.00'):
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return False
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if product_data.quantity and product_data.quantity < 0:
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return False
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return True
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def check_duplicate_product(db: Session, name: str) -> bool:
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"""
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Check if a product with the same name already exists.
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Args:
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db: Database session
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name: Product name to check
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Returns:
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bool: True if duplicate exists, False otherwise
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"""
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existing_product = db.query(Product).filter(Product.name == name).first()
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return bool(existing_product)
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def create_product_safely(db: Session, product_data: ProductCreate) -> Union[Product, Dict[str, str]]:
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"""
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Create a new product with validation and error handling.
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Args:
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db: Database session
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product_data: Product data for creation
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Returns:
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Product object if created successfully, error dict otherwise
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"""
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if not validate_product_data(product_data):
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raise HTTPException(status_code=400, detail="Invalid product data")
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if check_duplicate_product(db, product_data.name):
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raise HTTPException(status_code=400, detail="Product with this name already exists")
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try:
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db_product = Product(
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name=product_data.name,
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description=product_data.description,
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price=product_data.price,
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quantity=product_data.quantity,
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category_id=product_data.category_id
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)
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db.add(db_product)
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db.commit()
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db.refresh(db_product)
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return db_product
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except Exception as e:
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db.rollback()
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raise HTTPException(status_code=500, detail=f"Failed to create product: {str(e)}")
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def format_product_response(product: Product) -> Dict[str, Any]:
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"""
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Format product data for API response.
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Args:
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product: Product object to format
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Returns:
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Dict containing formatted product data
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"""
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return {
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"id": product.id,
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"name": product.name,
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"description": product.description,
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"price": str(product.price),
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"quantity": product.quantity,
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"category_id": product.category_id,
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"created_at": product.created_at.isoformat() if product.created_at else None
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}
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def validate_product_update(product_data: Dict[str, Any]) -> bool:
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"""
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Validate product data for updates.
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Args:
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product_data: Product update data to validate
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Returns:
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bool: True if update data is valid, False otherwise
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"""
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if "price" in product_data and product_data["price"] <= Decimal('0.00'):
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return False
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if "quantity" in product_data and product_data["quantity"] < 0:
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return False
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if "name" in product_data and len(product_data["name"].strip()) == 0:
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return False
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return True |