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BuecherwurmAPI.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="AutoMapper.Extensions.Microsoft.DependencyInjection" Version="7.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="3.1.4" />
+  </ItemGroup>
+
+
+</Project>

DTOs/LendRead.cs

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+using System;
+
+namespace BuecherwurmAPI.DTOs
+{
+    public class LendReadDTO
+    {
+        public int ItemId { get; set;}
+        public DateTime ReturnDate { get; set; }
+        public string Customer { get; set;  }
+        public bool Returned { get; set; }
+    }
+}

Data/ILendRepo.cs

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+using System.Collections.Generic;
+using BuecherwurmAPI.Models;
+
+namespace BuecherwurmAPI.Data
+{
+    public interface ILendRepo
+    {
+        IEnumerable<Lend> GetAllLends();
+        Lend GetLendById(int id);
+    }
+}

Data/MockLendRepo.cs

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+using System;
+using System.Collections.Generic;
+using BuecherwurmAPI.Models;
+
+namespace BuecherwurmAPI.Data
+{
+    public class MockLendRepo : ILendRepo
+    {
+        public IEnumerable<Lend> GetAllLends()
+        {
+            var lends = new List<Lend>
+            {
+                new Lend{Id = 1, Customer = "Nek0", ItemId = 1337, Returned = false, ReturnDate = DateTime.Now},
+                new Lend{Id = 2, Customer = "Shrubbery", ItemId = 1975, Returned = false, ReturnDate = DateTime.Now},
+                new Lend{Id = 3, Customer = "Felix", ItemId = 42, Returned = true, ReturnDate = DateTime.Now}
+            };
+
+            return lends;
+        }
+
+        public Lend GetLendById(int id)
+        {
+            return new Lend{Id = 1, Customer = "Nek0", ItemId = 1337, Returned = false, ReturnDate = DateTime.Now};
+        }
+    }
+}

Profiles/LendProfile.cs

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+using AutoMapper;
+using BuecherwurmAPI.DTOs;
+using BuecherwurmAPI.Models;
+
+namespace BuecherwurmAPI.Profiles
+{
+    public class LendProfile : Profile
+    {
+        public LendProfile()
+        {
+            CreateMap<Lend, LendReadDTO>();
+        }
+    }
+}

Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace BuecherwurmAPI
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(webBuilder =>
+                {
+                    webBuilder.UseStartup<Startup>();
+                });
+    }
+}

Properties/launchSettings.json

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+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:5975",
+      "sslPort": 44376
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "api",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "BuecherwurmAPI": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "launchUrl": "api",
+      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

Startup.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using AutoMapper;
+using BuecherwurmAPI.Data;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.HttpsPolicy;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace BuecherwurmAPI
+{
+    public class Startup
+    {
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public IConfiguration Configuration { get; }
+
+        // This method gets called by the runtime. Use this method to add services to the container.
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.AddControllers();
+            
+            // Adds a service that is created once per connection.
+            // It takes an interface and a specific implementation.
+            // That allows to swap the implementation easily.
+            services.AddScoped<ILendRepo, MockLendRepo>();
+
+            services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+
+            app.UseHttpsRedirection();
+
+            app.UseRouting();
+
+            app.UseAuthorization();
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapControllers();
+            });
+        }
+    }
+}

appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}

appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  },
+  "AllowedHosts": "*"
+}