# Business Models Example

This example demonstrates the business models in HeroDB, showcasing a complete business transaction flow from product definition to payment processing.

## Features Demonstrated

1. **Product Definition**: Creating two types of server node products with different components and pricing
2. **Component Definition**: Defining the parts that make up each server node (CPU, RAM, Storage, GPU)
3. **Pricing Setup**: Setting up prices for products using the Currency model
4. **Product Availability**: Checking which products can be purchased based on their status and availability
5. **Sales Process**: Simulating a customer purchasing a product
6. **Invoice Generation**: Creating an invoice for the sale
7. **Payment Processing**: Processing a payment for the invoice and updating its status

## Business Flow

The example follows this business flow:

```
Define Products → Check Availability → Customer Purchase → Generate Invoice → Process Payment
```

## Models Used

- **Product & ProductComponent**: For defining server nodes and their components
- **Customer**: For representing the buyer
- **Sale & SaleItem**: For recording the purchase transaction
- **Invoice & InvoiceItem**: For billing the customer
- **Payment**: For recording the payment

## Running the Example

To run this example, use:

```bash
cargo run --bin dbexample_biz
```

The output will show each step of the business process with relevant details.

## Key Concepts

- **Builder Pattern**: All models use builders for flexible object creation
- **Status Tracking**: Sales and invoices have status enums to track their state
- **Relationship Modeling**: The example shows how different business entities relate to each other
- **Financial Calculations**: Demonstrates tax and total calculations

This example provides a template for implementing business logic in your own applications using HeroDB.