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Exercise - Add routes

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Your first project with minimal API was well received. Now, your company wants to see an application that does a little more, like managing a resource. What resource to use is up to you. You're feeling hungry, so maybe pizza?

Add data

First you need some data. To store and manage data, you'll use an in-memory store.

1. Using Visual Studio Code, create a file named Db.cs in the project root and give it the following content:

    namespace PizzaStore.DB; 
   
    public record Pizza 
    {
      public int Id {get; set;} 
      public string ? Name { get; set; }
    }
   
    public class PizzaDB
    {
      private static List<Pizza> _pizzas = new List<Pizza>()
      {
        new Pizza{ Id=1, Name="Montemagno, Pizza shaped like a great mountain" },
        new Pizza{ Id=2, Name="The Galloway, Pizza shaped like a submarine, silent but deadly"},
        new Pizza{ Id=3, Name="The Noring, Pizza shaped like a Viking helmet, where's the mead"} 
      };
   
      public static List<Pizza> GetPizzas() 
      {
        return _pizzas;
      } 
   
      public static Pizza ? GetPizza(int id) 
      {
        return _pizzas.SingleOrDefault(pizza => pizza.Id == id);
      } 
   
      public static Pizza CreatePizza(Pizza pizza) 
      {
        _pizzas.Add(pizza);
        return pizza;
      }
   
      public static Pizza UpdatePizza(Pizza update) 
      {
        _pizzas = _pizzas.Select(pizza =>
        {
          if (pizza.Id == update.Id)
          {
            pizza.Name = update.Name;
          }
          return pizza;
        }).ToList();
        return update;
      }
   
      public static void RemovePizza(int id)
      {
        _pizzas = _pizzas.FindAll(pizza => pizza.Id != id).ToList();
      }
    }
   

Now that you have your data store, let's have the API use it next.

Connect data to routes

To connect your in-memory store to the API, you will:

1. Add the namespace. This addition is as simple as adding the proper using statement.
2. Set up the routes. Make sure you add all the route mappings that are needed to create, read, update, and delete.
3. Invoke it in the routes. Finally, you need to call the in-memory store per each route and pass in any parameters or body from the request, if applicable.

Now, connect data in your API.

1. At the top of the Program.cs file, add the following line of code:

   using PizzaStore.DB;
   

2. Just before app.Run(), add the following code:

   app.MapGet("/pizzas/{id}", (int id) => PizzaDB.GetPizza(id));
   app.MapGet("/pizzas", () => PizzaDB.GetPizzas());
   app.MapPost("/pizzas", (Pizza pizza) => PizzaDB.CreatePizza(pizza));
   app.MapPut("/pizzas", (Pizza pizza) => PizzaDB.UpdatePizza(pizza));
   app.MapDelete("/pizzas/{id}", (int id) => PizzaDB.RemovePizza(id));
   

3. Make sure you've saved all your changes. In the terminal, run the app:

   dotnet run
   

4. In your browser, go to http://localhost:{PORT}/swagger.

   You should see the following page rendering:

   

That's it! You've fully implemented your minimal API. You can use the Swagger UI to test each of your routes.

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