MY.QuickAPI

MY.QuickAPI is a .NET library that provides a set of powerful attributes for configuring database tables, columns, and constraints in a code-first approach. It simplifies the process of defining database schemas through C# attributes and automatically generates CRUD API endpoints.

Important: DI + Endpoint Lifecycle

• Endpoints are instantiated twice: once during AddQuickApi(...) only to let them register services via DefineServices(IServiceCollection), and once during UseQuickApi(app) to map routes using the final app.Services provider.
• Do not resolve scoped services (e.g., EF DbContext, IHubContext) in endpoint constructors. Instead, use method-parameter DI in your handlers (see examples below). Injecting IServiceProvider in the ctor is allowed, but avoid resolving scoped dependencies there.

Database Attributes

Table Configuration

SqlConstraintIndexAttribute

Defines indexes on database tables with support for both clustered and non-clustered indexes.

[SqlConstraintIndex(nameof(Email), IsUnique = true)]
[SqlConstraintIndex(nameof(LastName), nameof(FirstName), IsClustered = true)]
public class User 
{
    public string Email { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

SqlPrimaryKeyAttribute

Customizes the primary key configuration when you need a different setup than the default.

[SqlPrimaryKey(nameof(TenantId), nameof(UserId), Name = "PK_TenantUser")]
public class TenantUser
{
    public int TenantId { get; set; }
    public int UserId { get; set; }
}

Column Configuration

SqlComputedAttribute

Defines computed columns with optional persistence.

public class Employee
{
    public string FirstName { get; set; }
    public string LastName { get; set; }

    [SqlComputed("[FirstName] + ' ' + [LastName]", Stored = true)]
    public string FullName { get; set; }
}

SqlDefaultValueAttribute

Sets default values for columns using SQL expressions or literal values.

public class Article
{
    public string Title { get; set; }
    
    [SqlDefaultValue("GETUTCDATE()")]
    public DateTime CreatedAt { get; set; }
    
    [SqlDefaultValue("0")]
    public int ViewCount { get; set; }
}

Endpoint Generation

Automatic CRUD Endpoints

QuickAPI can automatically generate CRUD endpoints for your models by adding the EndpointDefinitionAttribute.

[EndpointDefinition]
public class Product : BaseModel
{
    public string Name { get; set; }
    public decimal Price { get; set; }
    public string Description { get; set; }
}

This will generate the following endpoints:

• GET /api/Product - Get a product by ID
• GET /api/Products - Get multiple products with filtering and sorting
• POST /api/Product - Create a new product
• PUT /api/Product - Update an existing product
• DELETE /api/Product - Delete a product
• POST /api/Products - Create multiple products at once

Using DTOs for API Endpoints

You can use DTOs for input/output models in your API endpoints in two different ways:

Approach 1: Using the EndpointDefinition Attribute with DtoType

The simplest approach is to specify the DTO type directly on your model:

// Define your DTO
public record ProductDto : BaseDto
{
    public Guid CategoryId { get; set; }
    public string? CategoryName { get; set; }
}

// Create mapper implementation
public class ProductMapper : IModelDtoMapper<Product, ProductDto>
{
    private readonly ILogger<ProductMapper> _logger;
    private readonly BaseContext _context;

    public ProductMapper(ILogger<ProductMapper> logger, BaseContext context)
    {
        _logger = logger;
        _context = context;
    }

    public ProductDto MapToDto(Product model)
    {
        return new ProductDto
        {
            Id = model.Id,
            Code = model.Name,
            Info = model.Description ?? string.Empty,
            CategoryId = model.CategoryId,
            CategoryName = model.Category?.Name
        };
    }

    public Product MapToModel(ProductDto dto, Product? model = null)
    {
        model ??= new Product();
        model.Id = dto.Id;
        model.Name = dto.Code;
        model.Description = dto.Info;
        model.CategoryId = dto.CategoryId;
        return model;
    }

    // Implement collection mapping methods...
}

// Register the DTO with your model using the attribute
[EndpointDefinition(
    CrudOperation = CrudOperation.All, 
    DtoType = typeof(ProductDto) // Specify the DTO type here
)]
public class Product : BaseModel, ITenantModel
{
    public Guid TenantId { get; set; }
    public Guid CategoryId { get; set; }
    public virtual Category? Category { get; set; }
}

// Register the mapper in a Definition class
public class MappersDefinition : IDefinition
{
    public void DefineServices(IServiceCollection services)
    {
        services.AddTransient<IModelDtoMapper<Product, ProductDto>, ProductMapper>();
    }
    
    // other methods...
}

Approach 2: Creating a Custom Endpoint Definition

For more control, you can create a custom endpoint definition:

// Define your model and disable automatic endpoint creation
[EndpointDefinition(AutomaticEndpointCreation = false)]
public class Category : BaseModel, ITenantModel
{
    public Guid TenantId { get; set; }
}

// Define your DTO
public record CategoryDto : BaseDto
{
    public int? ProductCount { get; set; }
}

// Create your mapper
public class CategoryMapper : IModelDtoMapper<Category, CategoryDto>
{
    public CategoryDto MapToDto(Category model)
    {
        return new CategoryDto
        {
            Id = model.Id,
            Code = model.Name,
            Info = model.Description ?? string.Empty
        };
    }
    
    // Other mapper methods...
}

// Create a custom endpoint definition
public class CategoryEndpoint : BaseDtoEndpointDefinition<Category, CategoryDto>
{
    public CategoryEndpoint(
        ILogger<CategoryEndpoint> logger,
        IModelDtoMapper<Category, CategoryDto> mapper)
        : base(logger, mapper)
    {
        // Configure CRUD operations
        CrudOperation = CrudOperation.All;

        // Configure authorization
        RequireAuthorization = true;
        CommonRole = nameof(UserRole.Admin);

        // Optional hooks
        OnBeforeGetMany = async (principal, options) =>
        {
            Logger.LogInformation("Custom before-hook executed");
            await Task.CompletedTask;
        };
    }

    public override void DefineServices(IServiceCollection services)
    {
        services.AddTransient<IModelDtoMapper<Category, CategoryDto>, CategoryMapper>();
    }

    // Use method-parameter DI for scoped services
    protected override async Task<IResult> GetManyAsync(
        BaseContext context,
        ClaimsPrincipal claimsPrincipal,
        BindableDataSourceLoadOptions options)
    {
        Logger.LogInformation("Custom GetManyAsync for CategoryEndpoint");
        // You can use 'context' safely here (scoped per request)
        return await base.GetManyAsync(context, claimsPrincipal, options);
    }
}

// Example: Auth endpoint with method-parameter DI for DbContext
public class AuthenticationEndpoint : EndPointDefinitionBase, IEndpointDefinition
{
    public AuthenticationEndpoint()
    {
        RequireAuthorization = false;
        CommonRole = nameof(UserRole.SuperAdmin);
    }

    public override void Define(WebApplication app)
    {
        const string name = "Authentication";
        app.MapPost($"/api/{name}", LoginAsync)
           .Produces<AuthenticationDto>()
           .WithTags(name)
           .AllowAnonymous();
    }

    protected virtual async Task<IResult> LoginAsync(
        BaseContext context,
        ILogger<AuthenticationEndpoint> logger,
        ITokenService tokenService,
        IConfiguration configuration,
        LoginDto userModel)
    {
        // Validate + read using 'context' (scoped)
        // ...
        return Results.Ok(new AuthenticationDto("user", "token"));
    }

    public override void DefineServices(IServiceCollection services)
    {
        services.AddScoped<ITokenService, TokenService>();
    }
}

Usage Examples

Creating a Table with Multiple Indexes

[SqlConstraintIndex(nameof(Email), IsUnique = true, Name = "UQ_User_Email")]
[SqlConstraintIndex(nameof(LastName), nameof(FirstName), IsClustered = true, Name = "IX_User_Name")]
public class User
{
    public int Id { get; set; }
    public string Email { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    
    [SqlDefaultValue("GETUTCDATE()")]
    public DateTime CreatedAt { get; set; }
    
    [SqlComputed("[FirstName] + ' ' + [LastName]")]
    public string FullName { get; set; }
}

Customizing Authorization for Endpoints

[EndpointDefinition(
    CommonRole = "Manager",
    GetRole = "User",
    PostRole = "Admin",
    AllowAnonymousGet = true
)]
public class Customer : BaseModel
{
    public string Name { get; set; }
    public string Email { get; set; }
}

Features

• Automatic API Generation: Generate CRUD endpoints with a single attribute
• DTO Support: Use Data Transfer Objects for API input/output
• Flexible Index Configuration: Create unique, clustered, and non-clustered indexes
• Computed Columns: Define computed columns with optional persistence
• Default Values: Specify SQL default values for columns
• Custom Primary Keys: Configure composite primary keys with custom naming
• Role-Based Authorization: Configure endpoint access by role

Best Practices

1. DTO Mapping:

   • Create dedicated DTO classes for external API communication
   • Implement custom mappers for precise control over property mapping
   • Register mappers in your service configuration

2. Index Naming:

   • Use meaningful names for indexes
   • Follow a consistent naming convention (e.g., IX_TableName_Columns for non-unique indexes)
   • Use UQ prefix for unique indexes
   • Always use nameof operator when referencing properties to maintain type safety

3. Authorization:

   • Use role-based authorization to secure endpoints
   • Configure different roles for different HTTP methods as needed
   • Consider which endpoints can be anonymous and which require authentication

4. Dependency Injection in Endpoints:

   • Constructors: inject only stable services (e.g., ILogger<T>, mappers, options). Avoid resolving scoped services here.
   • Handlers: prefer method-parameter DI for scoped/volatile services (e.g., BaseContext, IHubContext, IHttpContextAccessor).
   • Advanced: if you inject IServiceProvider in ctors, do not resolve scoped services there — resolve them within request handlers (or create a scope).

Setup

// Program.cs
builder.Services.AddQuickApi(typeof(Program), typeof(YourMarkerType));
// Optional: builder.Services.AddSignalR(); etc.

var app = builder.Build();
app.UseQuickApi();
// Optional: app.MapHub<YourHub>("/hubs/your");
app.Run();

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.