Moved projects to their own separate subdirectories

API/YABA.Data/Extensions/GenericDbSetExtensions.cs

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+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.ChangeTracking;
+using System.Collections.Generic;
+using System.Linq;
+using YABA.Models.Interfaces;
+
+namespace YABA.Data.Extensions
+{
+    public static class GenericDbSetExtensions
+    {
+        public static void Upsert<T>(this DbSet<T> dbSet, T entity) where T : class, IIdentifiable
+        {
+            var entityInList = new List<T>() { entity };
+            dbSet.UpsertRange(entityInList);
+        }
+
+        public static void UpsertRange<T>(this DbSet<T> dbSet, IEnumerable<T> entities) where T : class, IIdentifiable
+        {
+            foreach (var entity in entities)
+            {
+                var entityExists = dbSet.Any(x => x.Id == entity.Id);
+
+                if (entityExists)
+                {
+                    EntityEntry<T> attachedEntity = dbSet.Attach(entity);
+                    attachedEntity.State = EntityState.Modified;
+                }
+                else
+                {
+                    dbSet.Add(entity);
+                }
+            }
+        }
+    }
+}

API/YABA.Data/Extensions/UsersDbSetExtensions.cs

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+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using YABA.Models;
+
+namespace YABA.Data.Extensions
+{
+    public static  class UsersDbSetExtensions
+    {
+        public static async Task<bool> UserExistsAsync(this DbSet<User> userDbSet, int userId)
+        {
+            return await userDbSet.AnyAsync(x => x.Id == userId);
+        }
+
+        public static bool UserExists(this DbSet<User> userDbSet, int userId)
+        {
+            return userDbSet.Any(x => x.Id == userId);
+        }
+    }
+}