Squashed commit of the following:

commit d155f8fb5b
Author: Jonas Schönbach <jonas.schoenbach@yahoo.de>
Date:   Wed May 27 15:47:14 2020 +0200

    LendController um DTO ergänzt

commit 4afdb44e92
Author: Jonas Schönbach <jonas.schoenbach@yahoo.de>
Date:   Wed May 27 14:31:46 2020 +0200

    LendController um weitere Methoden ergänzt

commit 1c8ec4b517
Author: Jonas Schönbach <jonas.schoenbach@yahoo.de>
Date:   Wed May 27 11:22:29 2020 +0200

    flexiblere Umsetzung des LendControllers durch Depedency-Injection

commit d07c82f749
Author: Jonas Schönbach <jonas.schoenbach@yahoo.de>
Date:   Wed May 27 10:42:15 2020 +0200

    Überflüssige Dateien entfernt

commit e22296617c
Author: Jonas Schönbach <jonas.schoenbach@yahoo.de>
Date:   Wed May 27 10:38:00 2020 +0200

    Überflüssige Dateien entfernt

commit 774c7be7a9
Author: Jonas Schönbach <jonas.schoenbach@yahoo.de>
Date:   Wed May 27 10:33:53 2020 +0200

    .gitignore-Datei berichtigt

commit f00ecd5034
Author: Jonas Schönbach <jonas.schoenbach@yahoo.de>
Date:   Wed May 27 10:30:19 2020 +0200

    .gitignore-Datei hinzugefügt

commit fbe1e58a47
Author: Jonas Schönbach <jonas.schoenbach@yahoo.de>
Date:   Wed May 27 10:08:52 2020 +0200

    Erster Zwischenstand für die Ausleihe-Schnittstelle (mit Mock-Data)
    api/leihvorgang  -- gibt Liste aller Leihvorgänge zurück
    api/leihvorgang/{id} -- gibt bestimmten Leihvorgang zurück

.gitignore

@@ -586,6 +586,7 @@ fabric.properties
 # Android studio 3.1+ serialized cache file
 .idea/caches/build_file_checksums.ser
 
+<<<<<<< HEAD
 ### VisualStudioCode ###
 .vscode/*
 !.vscode/settings.json
@@ -780,4 +781,7 @@ $RECYCLE.BIN/
 # Backup folder for Package Reference Convert tool in Visual Studio 2017
 
 # End of https://www.gitignore.io/api/git,rider,linux,csharp,windows,dotnetcore,aspnetcore,visualstudio,visualstudiocode
+=======
+# End of https://www.gitignore.io/api/git,rider,linux,csharp,aspnetcore
+>>>>>>> ControllerJonas
 

BuecherwurmAPI.csproj

@@ -4,5 +4,10 @@
     <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>

Controllers/LendController.cs

@@ -0,0 +1,84 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using AutoMapper;
+using BuecherwurmAPI.Data;
+using BuecherwurmAPI.DTOs;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.JsonPatch;
+using Microsoft.Extensions.Logging;
+using BuecherwurmAPI.Models;
+
+namespace BuecherwurmAPI.Controllers
+{
+    [Route("api/leihvorgang")]
+    [ApiController]
+    public class LendController : ControllerBase
+    {
+        private readonly ILendRepo _repository;
+        private readonly IMapper _mapper;
+        
+        public LendController(ILendRepo repository, IMapper mapper)
+        {
+            _repository = repository;
+            _mapper = mapper;
+        }
+        
+        //GET api/leihvorgang
+        [HttpGet]
+        public ActionResult<IEnumerable<Lend>> LendsGet()
+        {
+            return Ok(_repository.GetAllLends());
+        }
+        
+        //POST api/leihvorgang
+        [HttpPost]
+        public ActionResult<LendReadDTO> LendsPost(Lend lend)
+        {
+            /*
+                Internally a lend is stored with an id
+                but the client shouldn't be allowed to set or change it
+                therefore the package 'AutoMapper' is used to prevent errors
+                that could happen when doing this task manually.
+                It takes the information from the client and maps it to the
+                corresponding internal object which then will be returned.
+                Furthermore it could be used to keep some attributes secret.
+                Another nice effect of this is that the implementation could be changed 
+                while the interface could be retained by some minor changes in the code.
+                
+                DTO stands for Data Transfer Object
+            */
+            var item = new Lend
+            {
+                Id = 256,
+                Customer = lend.Customer,
+                Returned = lend.Returned,
+                ItemId = lend.ItemId,
+                ReturnDate = lend.ReturnDate
+            };
+            return Ok(item);
+            //return Ok(_mapper.Map<LendReadDTO>(item));
+        }
+
+        //GET api/leihvorgang/{id}
+        [HttpGet("{id}")]
+        public ActionResult<Lend> LendById(int id)
+        {
+            var lend = _repository.GetLendById(id);
+            return Ok(lend);
+        }
+
+        //PATCH api/leihvorgang/{id}
+        [HttpPatch("{id}")]
+        public ActionResult LendPatchById(int id, JsonPatchDocument<Lend> patchDocument)
+        {
+            var lend = _repository.GetLendById(id);
+            if (lend == null)
+            {
+                return NotFound();
+            }
+            return Ok();
+        }
+    }
+}

Controllers/WeatherForecastController.cs

@@ -1,39 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Mvc;
-using Microsoft.Extensions.Logging;
-
-namespace BuecherwurmAPI.Controllers
-{
-    [ApiController]
-    [Route("[controller]")]
-    public class WeatherForecastController : ControllerBase
-    {
-        private static readonly string[] Summaries = new[]
-        {
-            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
-        };
-
-        private readonly ILogger<WeatherForecastController> _logger;
-
-        public WeatherForecastController(ILogger<WeatherForecastController> logger)
-        {
-            _logger = logger;
-        }
-
-        [HttpGet]
-        public IEnumerable<WeatherForecast> Get()
-        {
-            var rng = new Random();
-            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
-            {
-                Date = DateTime.Now.AddDays(index),
-                TemperatureC = rng.Next(-20, 55),
-                Summary = Summaries[rng.Next(Summaries.Length)]
-            })
-            .ToArray();
-        }
-    }
-}

DTOs/LendRead.cs

@@ -0,0 +1,12 @@
+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

@@ -0,0 +1,11 @@
+using System.Collections.Generic;
+using BuecherwurmAPI.Models;
+
+namespace BuecherwurmAPI.Data
+{
+    public interface ILendRepo
+    {
+        IEnumerable<Lend> GetAllLends();
+        Lend GetLendById(int id);
+    }
+}

Data/MockLendRepo.cs

@@ -0,0 +1,26 @@
+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};
+        }
+    }
+}

Models/Lend.cs

@@ -0,0 +1,13 @@
+using System;
+
+namespace BuecherwurmAPI.Models
+{
+    public class Lend
+    {
+        public int Id { get; set; }
+        public int ItemId { get; set;}
+        public DateTime ReturnDate { get; set; }
+        public string Customer { get; set;  }
+        public bool Returned { get; set; }
+    }
+}

Profiles/LendProfile.cs

@@ -0,0 +1,14 @@
+using AutoMapper;
+using BuecherwurmAPI.DTOs;
+using BuecherwurmAPI.Models;
+
+namespace BuecherwurmAPI.Profiles
+{
+    public class LendProfile : Profile
+    {
+        public LendProfile()
+        {
+            CreateMap<Lend, LendReadDTO>();
+        }
+    }
+}

Properties/launchSettings.json

@@ -12,7 +12,7 @@
     "IIS Express": {
       "commandName": "IISExpress",
       "launchBrowser": true,
-      "launchUrl": "weatherforecast",
+      "launchUrl": "api",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
       }
@@ -20,7 +20,7 @@
     "BuecherwurmAPI": {
       "commandName": "Project",
       "launchBrowser": true,
-      "launchUrl": "weatherforecast",
+      "launchUrl": "api",
       "applicationUrl": "https://localhost:5001;http://localhost:5000",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"

Startup.cs

@@ -2,6 +2,8 @@ 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;
@@ -26,6 +28,13 @@ namespace BuecherwurmAPI
         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.

WeatherForecast.cs

@@ -1,15 +0,0 @@
-using System;
-
-namespace BuecherwurmAPI
-{
-    public class WeatherForecast
-    {
-        public DateTime Date { get; set; }
-
-        public int TemperatureC { get; set; }
-
-        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
-
-        public string Summary { get; set; }
-    }
-}