transactions

back/persistance/data/relations/UserRelationEstablisher.cs

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+using back.DataModels;
+using Microsoft.EntityFrameworkCore;
+
+namespace back.persistance.data.relations;
+
+public class UserRelationEstablisher : IRelationEstablisher
+{
+    public void EstablishRelation(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<User>(entity =>
+        {
+            entity.HasOne(d => d.IdNavigation).WithOne(p => p.User)
+                .HasForeignKey<User>(d => d.Id)
+                .OnDelete(DeleteBehavior.ClientSetNull);
+
+            entity.HasMany(d => d.Roles).WithMany(p => p.Users)
+                .UsingEntity<Dictionary<string, object>>(
+                    "UserRole",
+                    r => r.HasOne<Role>().WithMany()
+                        .HasForeignKey("RoleId")
+                        .OnDelete(DeleteBehavior.ClientSetNull),
+                    l => l.HasOne<User>().WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.ClientSetNull),
+                    j =>
+                    {
+                        j.HasKey("UserId", "RoleId");
+                        j.ToTable("UserRoles");
+                    });
+        });
+    }
+}