fix: offload building DTOs to GUHF

DTO building allows for fully returning correct event's
skills and registrations

WebApp/DTOs/EventDetailsDto.cs

@@ -1,18 +1,21 @@
-using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations;
 using WebApp.Entities;
 
 namespace WebApp.DTOs;
 
 // Output values in JSON file
 public record class EventDetailsDto
-(
+{
-    int EventId,
+    public int EventId { get; set; }
-    [Required] int? OrganisationId,
+    [Required] public int? OrganisationId {  get; set; }
-    [Required] string? OrganisationName,
+    [Required] public string? OrganisationName { get; set; }
-    [Required][StringLength(50)] string Title,
+    [Required][StringLength(50)] public string Title { get; set; }
-    [StringLength(500)] string Description,
+    [StringLength(500)] public string Description { get; set; }
-    [Required][StringLength(100)] string Location,
+    [Required][StringLength(100)] public string Location { get; set; }
-    [Required] DateTime? EventDate,
+    [Required] public DateTime? EventDate { get; set; }
-    ICollection<EventSkill> EventSkills,
+    //ICollection<EventSkill> EventSkills,
-    ICollection<EventRegistration> EventRegistrations
+    public ICollection<SkillSummaryDto> EventSkills { get; set; }
-);
+    public ICollection<EventRegistrationDto> EventRegistrations { get; set; }
+
+    public EventDetailsDto() { }
+};

WebApp/DTOs/EventRegistrationDto.cs

@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+using WebApp.Entities;
+
+namespace WebApp.DTOs;
+
+public record class EventRegistrationDto
+{
+    public int EventId { get; set; }
+    public int UserId { get; set; }
+    public string UserName { get; set; }
+    public DateTime RegisteredAt { get; set; }
+
+    public EventRegistrationDto() { }
+
+};

WebApp/DTOs/EventSummaryDto.cs

@@ -1,17 +1,19 @@
-using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations;
 using WebApp.Entities;
 
 namespace WebApp.DTOs;
 
 // Output values in JSON file
-public record class EventSummaryDto(
+public record class EventSummaryDto {
-    int EventId,
+    public int EventId { get; set; }
-    [Required] string Organisation,
+    [Required] public string Organisation { get; set; }
-    [Required] int OrganisationId,
+    [Required] public int OrganisationId { get; set; }
-    [Required] [StringLength(50)] string Title,
+    [Required] [StringLength(50)] public string Title { get; set; }
-    [StringLength(500)] string Description,
+    [StringLength(500)] public string Description { get; set; }
-    [Required] [StringLength(100)] string Location,
+    [Required] [StringLength(100)] public string Location { get; set; }
-    [Required] DateTime? EventDate,
+    [Required] public DateTime? EventDate { get; set; }
-    ICollection<EventSkill> EventSkills,
+    public ICollection<EventSkill> EventSkills { get; set; }
-    ICollection<EventRegistration> EventRegistrations
+    public ICollection<EventRegistration> EventRegistrations { get; set; }
-    );
+
+
+};

WebApp/DTOs/EventSummaryNoErDto.cs

@@ -1,4 +1,4 @@
-using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations;
 using WebApp.Entities;
 
 namespace WebApp.DTOs;
@@ -13,4 +13,5 @@ public record class EventSummaryNoErDto(
     [Required][StringLength(100)] string Location,
     [Required] DateTime? EventDate,
     ICollection<EventSkill> EventSkills
+    // ICollection<SkillSummaryDto> EventSkills
 );

WebApp/DTOs/SkillSummaryDto.cs

@@ -1,9 +1,13 @@
-using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations;
+using WebApp.Entities;
 
 namespace WebApp.DTOs;
 
 public record class SkillSummaryDto
-(
+{
-    [Required] int SkillId,
+    public int? SkillId { get; set; }
-    [Required] string SkillName
+    public string? SkillName { get; set; }
-);
+
+    public SkillSummaryDto() { }
+
+};

WebApp/Endpoints/EventsEndpoints.cs

@@ -1,5 +1,7 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.EntityFrameworkCore;
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.Intrinsics.Arm;
 using WebApp.Data;
 using WebApp.DTOs;
 using WebApp.Entities;
@@ -40,14 +42,17 @@ namespace WebApp.Endpoints
                            .AsNoTracking()
                            .ToListAsync();
             });
-                
+
 
             // GET /events/1
-            group.MapGet("/{id}", 
+            group.MapGet("/{id}",
                 async (int id, ApplicationDbContext dbContext, HttpContext httpContext, GeneralUseHelpers guhf) =>
             {
-                Event? Eve = await dbContext.Events.FindAsync(id);
 
+                Event? Eve = await dbContext
+                    .Events
+                    .Include(e => e.Organisation)
+                    .FirstOrDefaultAsync(e => e.EventId == id);
                 if (Eve is null) return Results.NotFound();
 
                 // Sprawdź, czy token należy do organizacji, a jeżeli tak, to do której.
@@ -55,16 +60,14 @@ namespace WebApp.Endpoints
                 Organisation? org = await guhf.GetOrganisationFromToken(token);
 
                 // Jeśli token należy do organizacji, która utworzyła to wydarzenie,
-                // to zwróć także EventRegistrations. W przeciwnym razie usuń to pole
+                // to zwróć także EventRegistrations. W przeciwnym razie niech będzie to
-                // przed jego wysłaniem!
+                // puste pole.
-                if (org is null || org.OrganisationId != Eve.OrganisationId) Eve.EventRegistrations = [];
+                List<EventDetailsDto> result = await guhf.BuildDetailedEventsDto(
+                    dbContext,
+                    (org is not null && Eve.Organisation == org)
+                );
 
-                // DLACZEGO?
+                return Results.Ok(result.FirstOrDefault(e => e.EventId == id));
-                Eve.Organisation = await guhf.GetOrganisationFromId(Eve.OrganisationId);
-
-                EventDetailsDto EveDto = Eve.ToEventDetailsDto();
-
-                return Results.Ok(EveDto); //EventDetailsDto
             })
             .WithName(GetEventEndpointName);
 
@@ -214,6 +217,9 @@ namespace WebApp.Endpoints
 
                         // UWAGA! TO NIE POWINNO TAK DZIAŁAĆ!
                         // KTOKOLWIEK WIDZIAŁ, KTOKOLWIEK WIE CZEMU Organisation JEST null?
+                        //
+                        // Odpowiedź: Bo pobieramy dane bez .Include(e => e.Organisation),
+                        // co zapobiega masie innych problemów, m.in. rekurencyjnym importom.
                         e.Organisation = await guhf.GetOrganisationFromId(e.OrganisationId);
 
                         if (matchFound) SearchResults.Add(e.ToEventSummaryDto());

WebApp/Endpoints/GeneralUseHelperFunctions.cs

@@ -1,5 +1,6 @@
-using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore;
 using WebApp.Data;
+using WebApp.DTOs;
 using WebApp.Entities;
 
 namespace WebApp.Endpoints;
@@ -112,4 +113,49 @@ public class GeneralUseHelpers
         // Sprawdza, czy któreś ze słów pasuje (nawet częściowo) do searchTerm
         return words.Any(word => word.Contains(searchTerm, StringComparison.OrdinalIgnoreCase));
     }
+
+    public async Task<List<EventDetailsDto>> BuildDetailedEventsDto(ApplicationDbContext context, bool includeEventRegistrations = false)
+    {
+        // https://khalidabuhakmeh.com/ef-core-and-aspnet-core-cycle-issue-and-solution
+
+        // Jeśli token należy do organizacji, która utworzyła to wydarzenie,
+        // to zwróć także EventRegistrations. W przeciwnym razie niech będzie to
+        // puste pole.
+        ICollection<EventRegistrationDto> ERs = new List<EventRegistrationDto>();
+        if (includeEventRegistrations)
+        {
+            ERs = await context
+                .EventRegistrations
+                .Select(er => new EventRegistrationDto
+                {
+                    EventId = er.EventId,
+                    UserId = er.UserId,
+                    UserName = er.User.FirstName + " " + er.User.LastName,
+                    RegisteredAt = er.RegisteredAt
+                }).ToListAsync();
+        }
+
+        List<EventDetailsDto> result = await context
+                .Events
+                .Select(e => new EventDetailsDto
+                {
+                    EventId = e.EventId,
+                    OrganisationId = e.OrganisationId,
+                    OrganisationName = e.Organisation.Name,
+                    Title = e.Title,
+                    Description = e.Description,
+                    Location = e.Location,
+                    EventDate = e.EventDate,
+                    EventSkills = e
+                        .EventSkills
+                        .Select(es => new SkillSummaryDto
+                        {
+                            SkillId = es.SkillId,
+                            SkillName = es.Skill.Name
+                        }).ToList(),
+                    EventRegistrations = ERs
+                }).ToListAsync();
+
+        return result;
+    }
 }

WebApp/Mapping/EventMapping.cs

@@ -1,4 +1,4 @@
-using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore;
 using WebApp.DTOs;
 using WebApp.Entities;
 
@@ -34,20 +34,21 @@ public static class EventMapping
 
     public static EventSummaryDto ToEventSummaryDto(this Event myEvent)
     {
-        return new EventSummaryDto(
+        return new EventSummaryDto {
-            myEvent.EventId,
+            EventId            = myEvent.EventId,
-            myEvent.Organisation!.Name,
+            Organisation       = myEvent.Organisation!.Name,
-            myEvent.OrganisationId,
+            OrganisationId     = myEvent.OrganisationId,
-            myEvent.Title,
+            Title              = myEvent.Title,
-            myEvent.Description,
+            Description        = myEvent.Description,
-            myEvent.Location,
+            Location           = myEvent.Location,
-            myEvent.EventDate,
+            EventDate          = myEvent.EventDate,
-            myEvent.EventSkills,
+            EventSkills        = myEvent.EventSkills,
-            myEvent.EventRegistrations
+            EventRegistrations = myEvent.EventRegistrations
-        );
+        };
     }
     public static EventSummaryNoErDto ToEventSummaryNoErDto(this Event myEvent)
     {
+
         return new EventSummaryNoErDto(
             myEvent.EventId,
             myEvent.Organisation!.Name,
@@ -60,18 +61,42 @@ public static class EventMapping
         );
     }
 
+    public static EventRegistrationDto ToEventRegistrationDto(this EventRegistration myER)
+    {
+
+        return new EventRegistrationDto {
+            EventId      = myER.EventId,
+            UserId       = myER.UserId,
+            UserName     = myER.User.FirstName + " " + myER.User.LastName,
+            RegisteredAt = myER.RegisteredAt
+        };
+    }
+
     public static EventDetailsDto ToEventDetailsDto(this Event myEvent)
     {
-        return new EventDetailsDto(
+        List<SkillSummaryDto>      ssdto = new List<SkillSummaryDto>();
-            myEvent.EventId,
+        List<EventRegistrationDto> erdto = new List<EventRegistrationDto>();
-            myEvent.OrganisationId,
+
-            myEvent.Organisation.Name,
+        foreach (EventSkill es in myEvent.EventSkills)
-            myEvent.Title,
+        {
-            myEvent.Description,
+            ssdto.Add(es.ToSkillSummaryDto());
-            myEvent.Location,
+        }
-            myEvent.EventDate,
+
-            myEvent.EventSkills,
+        foreach (EventRegistration er in myEvent.EventRegistrations)
-            myEvent.EventRegistrations
+        {
-        );
+            erdto.Add(er.ToEventRegistrationDto());
+        }
+
+        return new EventDetailsDto {
+            EventId            = myEvent.EventId,
+            OrganisationId     = myEvent.OrganisationId,
+            OrganisationName   = myEvent.Organisation.Name,
+            Title              = myEvent.Title,
+            Description        = myEvent.Description,
+            Location           = myEvent.Location,
+            EventDate          = myEvent.EventDate,
+            EventSkills        = ssdto,
+            EventRegistrations = erdto
+        };
     }
-}
+}

WebApp/Mapping/EventSkillMapping.cs

@@ -13,4 +13,12 @@ public static class EventSkillMapping
             SkillId = SSDto.Skill,
         };
     }
+
+    public static SkillSummaryDto ToSkillSummaryDto(this EventSkill es)
+    {
+        return new SkillSummaryDto{
+            SkillId   = es.SkillId,
+            SkillName = es.Skill.Name
+        };
+    }
 }

WebApp/Mapping/SkillMapping.cs

@@ -1,4 +1,4 @@
-using WebApp.DTOs;
+using WebApp.DTOs;
 using WebApp.Entities;
 
 namespace WebApp.Mapping
@@ -16,10 +16,10 @@ namespace WebApp.Mapping
 
         public static SkillSummaryDto ToSkillSummaryDto(this Skill s)
         {
-            return new SkillSummaryDto(
+            return new SkillSummaryDto {
-                s.SkillId,
+                SkillId   = s.SkillId,
-                s.Name
+                SkillName = s.Name
-            );
+            };
         }
     }
 }