Refactored DB to be Series->Volumes->Chapters instead. All functionality that previously worked still works. Cleanup still needed.

API/Data/VolumeRepository.cs

@@ -0,0 +1,61 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using API.DTOs;
+using API.Entities;
+using API.Interfaces;
+using AutoMapper;
+using AutoMapper.QueryableExtensions;
+using Microsoft.EntityFrameworkCore;
+
+namespace API.Data
+{
+    public class VolumeRepository : IVolumeRepository
+    {
+        private readonly DataContext _context;
+        private readonly IMapper _mapper;
+
+        public VolumeRepository(DataContext context, IMapper mapper)
+        {
+            _context = context;
+            _mapper = mapper;
+        }
+        
+        public void Update(Volume volume)
+        {
+            _context.Entry(volume).State = EntityState.Modified;
+        }
+
+        /// <summary>
+        /// Returns a Chapter for an Id. Includes linked <see cref="MangaFile"/>s.
+        /// </summary>
+        /// <param name="chapterId"></param>
+        /// <returns></returns>
+        public async Task<Chapter> GetChapterAsync(int chapterId)
+        {
+            return await _context.Chapter
+                .Include(c => c.Files)
+                .AsNoTracking()
+                .SingleOrDefaultAsync(c => c.Id == chapterId);
+        }
+
+        public async Task<ChapterDto> GetChapterDtoAsync(int chapterId)
+        {
+            var chapter = await _context.Chapter
+                .Include(c => c.Files)
+                .ProjectTo<ChapterDto>(_mapper.ConfigurationProvider)
+                .AsNoTracking()
+                .SingleOrDefaultAsync(c => c.Id == chapterId);
+
+            return chapter;
+        }
+
+        public async Task<IList<MangaFile>> GetFilesForChapter(int chapterId)
+        {
+            return await _context.MangaFile
+                .Where(c => chapterId == c.Id)
+                .AsNoTracking()
+                .ToListAsync();
+        }
+    }
+}