09 Nov 2023
Here are some real-world examples of domain models in DDD:
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E-commerce website: The domain model for an e-commerce website might include entities such as products, customers, orders, and payments. The relationships between these entities would be modeled to capture the business rules of the website, such as how products are associated with customers, how orders are placed and fulfilled, and how payments are processed.
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Entities:
- Products
- Customers
- Orders
- Payments
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Relationships:
- Products and Customers: Customers can view and purchase products.
- Orders and Customers: Customers place orders.
- Payments and Orders: Payments are linked to specific orders.
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Business Rules:
- Customers can browse and buy multiple products.
- An order is created when a customer purchases one or more products.
- Payments are processed for completed orders.
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Social media platform: The domain model for a social media platform might include entities such as users, posts, comments, and likes. The relationships between these entities would be modeled to capture the business rules of the social media platform, such as how users can post content, how other users can interact with that content, and how users can connect with each other.
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Entities:
- Users
- Posts
- Comments
- Likes
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Relationships:
- Users and Posts: Users create and share posts.
- Users and Comments: Users can comment on posts.
- Users and Likes: Users can like posts.
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Business Rules:
- Users can create, share, and interact with posts.
- Users can comment on and like posts.
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Customer relationship management (CRM) system: The domain model for a CRM system might include entities such as customers, accounts, contacts, and opportunities. The relationships between these entities would be defined, along with the business rules that govern how they can be manipulated.
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Entities:
- Customers
- Accounts
- Contacts
- Opportunities
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Relationships:
- Customers and Accounts: Customers can have multiple accounts.
- Accounts and Contacts: Accounts are associated with multiple contacts.
- Opportunities and Accounts: Opportunities are linked to specific accounts.
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Business Rules:
- Customers can have multiple accounts with different contacts.
- Accounts are connected to various contacts.
- Opportunities are tied to specific accounts.
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Banking system: The domain model for a banking system might include entities such as accounts, customers, transactions, and loans. The relationships between these entities would be defined, along with the business rules that govern how they can be manipulated.
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Entities:
- Accounts
- Customers
- Transactions
- Loans
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Relationships:
- Customers and Accounts: Customers can have multiple accounts.
- Accounts and Transactions: Transactions occur within specific accounts.
- Loans and Customers: Loans are associated with specific customers.
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Business Rules:
- Customers can have multiple accounts with various transactions.
- Transactions are linked to specific accounts.
- Loans are connected to individual customers.
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Healthcare system: The domain model for a healthcare system might include entities such as patients, doctors, appointments, and prescriptions. The relationships between these entities would be defined, along with the business rules that govern how they can be manipulated.
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Entities:
- Patients
- Doctors
- Appointments
- Prescriptions
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Relationships:
- Patients and Doctors: Patients schedule appointments with doctors.
- Appointments and Doctors: Appointments are made with specific doctors.
- Prescriptions and Patients: Prescriptions are associated with specific patients.
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Business Rules:
- Patients can schedule appointments with specific doctors.
- Appointments are connected to individual doctors.
- Prescriptions are linked to specific patients.
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