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content/02-Project-Based/Session03/Session03 Backend.md

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+
+# 🛠️ Task Checklist
+
+## Repository Pattern Preparation
+- [ ] Watch [video 1 (Brief Introduction](https://www.youtube.com/watch?v=Wiy54682d1w&ab_channel=PatrickGod) & [video 2 (More Detailed Introduction)](https://youtu.be/rtXpYpZdOzM)
+### Purpose:
+Meditates between the domain and data mapping layers, acting like an **in-memory collection** of domain objects
+### Benefits
+- Minimizes duplicate query logic 
+- Decouples your application from persistence frameworks
+- Promotes testability
+> Repository should not have methods like Update and Save
+## Unit of Work Preparation
+Keeps track of changes and coordinates the writings and savings
+### Implementation:
+- [ ] Watch [video](https://youtu.be/rtXpYpZdOzM?t=703)
+
+## 🚧Branching (Implementing Repository Pattern)
+- [ ] Create the feature/repositories branch based on develop
+
+## Creating `IRepository` in Domain 
+- [ ] Create the interface and add the following code
+📂 Suggested Folder: `Domain/Framework/Interfaces/Respositories`
+```c#
+public interface IRepository<T_Entity, U_PrimaryKey> where T_Entity : class
+{
+    Task<T_Entity?> GetByIdAsync(U_PrimaryKey id); 
+    Task<IEnumerable<T_Entity>> GetAllAsync();
+    Task<IEnumerable<T_Entity>> FindAsync(Expression<Func<T_Entity, bool>> predicate);
+    Task AddAsync(T_Entity entity);
+    void Update(T_Entity entity);
+    void Remove(T_Entity entity);
+}
+```
+## Creating a class implementing `IRepository`
+- [ ] create a class named `BaseRepository` or `Repository` (choose one) in Infrastructure and implement `IRepository`
+
+📂 Suggested Folder: `Infrastructure/Framework/Base`
+- [ ] provide method definitions for the methods 
+```c#
+public class BaseRepository<K_DbContext, T_Entity, U_PrimaryKey> : IRepository<T_Entity, U_PrimaryKey>
+                                                                      where T_Entity : class
+                                                                      where K_DbContext : DbContext
+{
+    public virtual K_DbContext DbContext { get; set; }
+    public virtual DbSet<T_Entity> DBSet{ get; set; }
+    
+    public BaseRepository(K_DbContext dbContext)
+    {
+        DbContext = dbContext;
+        DBSet = dbContext.Set<T_Entity>();
+    }
+    
+    public async Task AddAsync(T_Entity entity)
+    {
+        await DBSet.AddAsync(entity);
+    }
+    
+    public async Task<T_Entity?> GetByIdAsync(U_PrimaryKey id)
+    {
+        return await DBSet.FindAsync(id);
+    }
+    public async Task<IEnumerable<T_Entity>> GetAllAsync()
+    {
+        var entityList = DBSet.ToListAsync();
+        return await entityList;
+    }
+    public void Update(T_Entity entity)
+    {
+        DBSet.Update(entity);
+    }
+    public void Remove(T_Entity entity)
+    {
+        DBSet.Remove(entity);
+    }
+
+    public async Task<IEnumerable<T_Entity>> FindAsync(Expression<Func<T_Entity, bool>> predicate)
+    {
+        return await DBSet.Where(predicate).ToListAsync();
+    }
+}
+```
+
+## Creating an interface for each entity
+> (not for the join tables)
+
+- [ ] For each entity, create an interface that inherits `IRepository`
+- [ ] (Optional): Add method definitions as you deem needed for that entity (not recommended right now. We will come back to this part later)
+
+📂 Suggested Folder: Domain/Framework/Base/Interfaces/[Related Folder]`
+for example:
+```c#
+public interface IAccountRepository : IRepository<Account, long>
+{
+
+}
+```
+
+### Reference Project:
+[Reference](https://github.com/MehrdadShirvani/AlibabaClone-Backend/tree/develop/AlibabaClone.Domain/Framework/Interfaces/Repositories)
+## Implementing each `I[Entity]Repository`
+
+📂 Suggested Folder: Infrastructure/Services/[Related Folder]
+- [ ] For each entity, create an class named `[Entity]Repository` that implements `I[Entity]Repository` and inherits `BaseRepository` 
+
+for example:
+```c#
+public class AccountRepository :
+    BaseRepository<ApplicationDBContext, Account, long>,
+    IAccountRepository
+{
+    public AccountRepository(ApplicationDBContext dbContext) : base(dbContext)
+    {
+
+    }
+}
+```
+### Reference Project:
+[Reference](https://github.com/MehrdadShirvani/AlibabaClone-Backend/tree/develop/AlibabaClone.Infrastructure/Services)
+
+## Registering Services
+- [ ] Modify `Program.cs` in Presentation, and register for each `I[Entity]Repository` the related `[Entity]Repository`
+
+```c#
+//some code
+//Register Repositories
+builder.Services.AddScoped<IAccountRepository, AccountRepository>();
+builder.Services.AddScoped<IGenderRepository, GenderRepository>();
+builder.Services.AddScoped<IPersonRepository, PersonRepository>();
+builder.Services.AddScoped<IRoleRepository, RoleRepository>();
+//...
+
+//some code
+```
+## 🚧Merge
+- [ ] Create a PR and merge the current branch with develop
+
+
+---
+
+## 🚧Branching
+- [ ] Create the feature/UnitOfWork branch based on develop
+
+
+```c#
+public interface IUnitOfWork : IDisposable
+{
+    Task<int> SaveChangesAsync();
+}
+```
+
+## Creating `IUnitOfWork`
+- [ ] Create the interface that inherits `IDisposable` and add the following code
+
+📂 Suggested Folder: `Domain/Framework/Interfaces`
+
+```c#
+public interface IUnitOfWork : IDisposable
+{
+    Task<int> SaveChangesAsync();
+}
+```
+
+## Implementing `IUnitOfWork`
+- [ ] create a class named `UnitOfWork`  in Infrastructure and implement `IUnitOfWork`
+
+📂 Suggested Folder: `Infrastructure/Framework/Base`
+
+- [ ] provide method definitions for the methods
+
+```c#
+public class UnitOfWork : IUnitOfWork
+{
+    private readonly ApplicationDBContext _context;
+    
+    public UnitOfWork(ApplicationDBContext context)
+    {
+        _context = context;
+    }
+
+    public void Dispose()
+    {
+        _context.Dispose();
+    }
+
+    public async Task<int> SaveChangesAsync()
+    {
+        return await _context.SaveChangesAsync();
+    }
+}
+```
+
+## Registering Services
+- [ ] Modify `Program.cs` in Presentation, and register the `UnitOfWork` Service
+
+```c#
+//some code
+//Register Repositories
+builder.Services.AddScoped<IUnitOfWork, UnitOfWork>();
+//some code
+```
+
+## 🚧Merge
+- [ ] Create a PR and merge the current branch with develop
+
+
+# 🧠 Hints & Notes
+# 🙌 Acknowledgements
+
+- ChatGPT for snippet refinement and explanations
+# 🔍 References
+[[Session03 Additional Info]]
+
+