Domain Model

Domain Model

1. Budget Class: budget as a group of categories and transactions

   • Attributes:
     • categories: dictionary with category names (strings) as keys and Category objects as values
     • transactions: list of Transaction objects within this budget

2. Category Class: category within a budget

   • Attributes:
     • name: category name (string)
     • spent: total amount spent in this category (double)
     • limit: spending limit for this category (double)

3. Transaction Class: transaction within a budget

   • Attributes:
     • amount: transaction amount (double)
     • category: transaction category (Category object)
     • date: transaction date and time (DateTime object)

Explanation of Relationships:

• 1 to * Relationship between Budget and Category:
  • A budget can have many ('*') categories, but each category can have only one ('1') budget
• 1 to * Relationship between Category and Transaction:
  • A category can have many ('*') transactions, but each transaction can have only one ('1') category