Program.cs

using ContosoPizza.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.OpenApi.Models;

const string MyAllowSpecificOrigins = "_myAllowSpecificOrigins";


var builder = WebApplication.CreateBuilder(args);

//checks the configuration provider for a connection string named Pizzas. If it
//doesn't find one, it will use Data Source=Pizzas.db as the connection string. SQLite will map this string to a file
var connectionString = builder.Configuration.GetConnectionString("Pizzas") ?? "Data Source=Pizzas.db";

builder.Services.AddEndpointsApiExplorer();
//builder.Services.AddDbContext<PizzaDb>(options => options.UseInMemoryDatabase("items"));
builder.Services.AddSqlite<PizzaDb>(connectionString);
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo { Title = "PizzaStore API",
        Description = "Susan learning swagger documentation in minimal Apis", 
        Version = "v1" });
});

builder.Services.AddCors(options =>
{
    options.AddPolicy(name: MyAllowSpecificOrigins,
      builder =>
      {
          builder.WithOrigins("*");
      });
});

var app = builder.Build();

app.UseSwagger();
app.UseSwaggerUI(c =>
{
    c.SwaggerEndpoint("/swagger/v1/swagger.json",
        "PizzaStore API V1");
});

app.UseCors(MyAllowSpecificOrigins);


app.MapGet("/", () => "Hello World!");
// get method returns a list of pizzas 
app.MapGet("/pizzas", async (PizzaDb db) => await db.Pizzas.ToListAsync());

// gets a pizza depending on the id that has been provided
app.MapGet("/pizza/{id}", async (PizzaDb db, int id) => await db.Pizzas.FindAsync(id));

// creates a pizza object in the database and saves the changes 

app.MapPost("/pizza", async (PizzaDb db, Pizza pizza) =>
{
    await db.Pizzas.AddAsync(pizza);
    await db.SaveChangesAsync();
    return Results.Created($"/pizza/{pizza.Id}", pizza);
});

// update the pizza object in the database using the id of the object

app.MapPut("/pizza/{id}", async (PizzaDb db, Pizza updatepizza, int id) =>
{
    var pizza = await db.Pizzas.FindAsync(id);
    if (pizza is null) return Results.NotFound();
    pizza.Name = updatepizza.Name;
    pizza.Description = updatepizza.Description;
    await db.SaveChangesAsync();
    return Results.NoContent();
});

// delete a pizza object using the id
app.MapDelete("/pizza/{id}", async (PizzaDb db, int id) =>
{
    var pizza = await db.Pizzas.FindAsync(id);
    if (pizza is null)
    {
        return Results.NotFound();
    }
    db.Pizzas.Remove(pizza);
    await db.SaveChangesAsync();
    return Results.Ok();
});

app.Run();