save collection page size (#157)

ErsatzTV.Application/MediaCollections/PagedMediaCollectionsViewModel.cs

@@ -0,0 +1,6 @@
+using System.Collections.Generic;
+
+namespace ErsatzTV.Application.MediaCollections
+{
+    public record PagedMediaCollectionsViewModel(int TotalCount, List<MediaCollectionViewModel> Page);
+}

ErsatzTV.Application/MediaCollections/Queries/GetPagedCollections.cs

@@ -0,0 +1,6 @@
+using MediatR;
+
+namespace ErsatzTV.Application.MediaCollections.Queries
+{
+    public record GetPagedCollections(int PageNum, int PageSize) : IRequest<PagedMediaCollectionsViewModel>;
+}

ErsatzTV.Application/MediaCollections/Queries/GetPagedCollectionsHandler.cs

@@ -0,0 +1,32 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Core.Interfaces.Repositories;
+using LanguageExt;
+using MediatR;
+using static ErsatzTV.Application.MediaCollections.Mapper;
+
+namespace ErsatzTV.Application.MediaCollections.Queries
+{
+    public class GetPagedCollectionsHandler : IRequestHandler<GetPagedCollections, PagedMediaCollectionsViewModel>
+    {
+        private readonly IMediaCollectionRepository _mediaCollectionRepository;
+
+        public GetPagedCollectionsHandler(IMediaCollectionRepository mediaCollectionRepository) =>
+            _mediaCollectionRepository = mediaCollectionRepository;
+
+        public async Task<PagedMediaCollectionsViewModel> Handle(
+            GetPagedCollections request,
+            CancellationToken cancellationToken)
+        {
+            int count = await _mediaCollectionRepository.CountAllCollections();
+
+            List<MediaCollectionViewModel> page = await _mediaCollectionRepository
+                .GetPagedCollections(request.PageNum, request.PageSize)
+                .Map(list => list.Map(ProjectToViewModel).ToList());
+
+            return new PagedMediaCollectionsViewModel(count, page);
+        }
+    }
+}

ErsatzTV.Core.Tests/Fakes/FakeMediaCollectionRepository.cs

@@ -26,6 +26,11 @@ namespace ErsatzTV.Core.Tests.Fakes
             throw new NotSupportedException();
 
         public Task<List<Collection>> GetAll() => throw new NotSupportedException();
+        public Task<int> CountAllCollections() => throw new NotSupportedException();
+
+        public Task<List<Collection>> GetPagedCollections(int pageNumber, int pageSize) =>
+            throw new NotSupportedException();
+
         public Task<Option<List<MediaItem>>> GetItems(int id) => Some(_data[id].ToList()).AsTask();
         Task<bool> IMediaCollectionRepository.Update(Collection collection) => throw new NotSupportedException();
         public Task Delete(int collectionId) => throw new NotSupportedException();

ErsatzTV.Core/Interfaces/Repositories/IMediaCollectionRepository.cs

@@ -15,6 +15,8 @@ namespace ErsatzTV.Core.Interfaces.Repositories
         Task<Option<Collection>> GetCollectionWithItemsUntracked(int id);
         Task<Option<Collection>> GetCollectionWithCollectionItemsUntracked(int id);
         Task<List<Collection>> GetAll();
+        Task<int> CountAllCollections();
+        Task<List<Collection>> GetPagedCollections(int pageNumber, int pageSize);
         Task<Option<List<MediaItem>>> GetItems(int id);
         Task<bool> Update(Collection collection);
         Task Delete(int collectionId);

ErsatzTV.Infrastructure/Data/Repositories/MediaCollectionRepository.cs

@@ -15,10 +15,15 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
     {
         private readonly IDbConnection _dbConnection;
         private readonly TvContext _dbContext;
+        private readonly IDbContextFactory<TvContext> _dbContextFactory;
 
-        public MediaCollectionRepository(TvContext dbContext, IDbConnection dbConnection)
+        public MediaCollectionRepository(
+            TvContext dbContext,
+            IDbContextFactory<TvContext> dbContextFactory,
+            IDbConnection dbConnection)
         {
             _dbContext = dbContext;
+            _dbContextFactory = dbContextFactory;
             _dbConnection = dbConnection;
         }
 
@@ -29,7 +34,6 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
             return collection;
         }
 
-
         public async Task<bool> AddMediaItem(int collectionId, int mediaItemId)
         {
             var modified = false;
@@ -168,6 +172,22 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
         public Task<List<Collection>> GetAll() =>
             _dbContext.Collections.ToListAsync();
 
+        public Task<int> CountAllCollections() =>
+            _dbConnection.QuerySingleAsync<int>(@"SELECT COUNT (*) FROM Collection");
+
+        public async Task<List<Collection>> GetPagedCollections(int pageNumber, int pageSize)
+        {
+            await using TvContext dbContext = _dbContextFactory.CreateDbContext();
+            return await dbContext.Collections.FromSqlRaw(
+                    @"SELECT * FROM Collection
+                    ORDER BY Name
+                    LIMIT {0} OFFSET {1}",
+                    pageSize,
+                    (pageNumber - 1) * pageSize)
+                .AsNoTracking()
+                .ToListAsync();
+        }
+
         public Task<Option<List<MediaItem>>> GetItems(int id) =>
             Get(id).MapT(GetItemsForCollection).Bind(x => x.Sequence());
 
@@ -227,7 +247,7 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                 .Filter(m => ids.Contains(m.Id))
                 .ToListAsync();
         }
-        
+
         private async Task<List<MusicVideo>> GetArtistItems(Collection collection)
         {
             IEnumerable<int> ids = await _dbConnection.QueryAsync<int>(

ErsatzTV/ErsatzTV.csproj

@@ -16,6 +16,7 @@
         <PrivateAssets>all</PrivateAssets>
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       </PackageReference>
+      <PackageReference Include="Blazored.LocalStorage" Version="3.0.0" />
       <PackageReference Include="FluentValidation" Version="9.5.3" />
       <PackageReference Include="FluentValidation.AspNetCore" Version="9.5.3" />
       <PackageReference Include="LanguageExt.Core" Version="3.4.15" />

ErsatzTV/Pages/Collections.razor

@@ -1,13 +1,20 @@
 @page "/media/collections"
+@using Microsoft.Extensions.Caching.Memory
+@using Blazored.LocalStorage
 @using ErsatzTV.Application.MediaCollections
 @using ErsatzTV.Application.MediaCollections.Commands
 @using ErsatzTV.Application.MediaCollections.Queries
 @using ErsatzTV.Application.MediaCards
 @inject IDialogService Dialog
 @inject IMediator Mediator
+@inject IMemoryCache MemoryCache
+@inject ILocalStorageService LocalStorage
 
 <MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
-    <MudTable Hover="true" Items="_data" Dense="true">
+    <MudTable Hover="true"
+              ServerData="@(new Func<TableState, Task<TableData<MediaCollectionViewModel>>>(ServerReload))"
+              Dense="true"
+              @ref="                    _table">
         <ToolBarContent>
             <MudText Typo="Typo.h6">Collections</MudText>
         </ToolBarContent>
@@ -16,11 +23,7 @@
             <col style="width: 120px;"/>
         </ColGroup>
         <HeaderContent>
-            <MudTh>
+            <MudTh>Name</MudTh>
-                <MudTableSortLabel SortBy="new Func<MediaCollectionViewModel, object>(x => x.Name)">
-                    Name
-                </MudTableSortLabel>
-            </MudTh>
             <MudTh/>
         </HeaderContent>
         <RowTemplate>
@@ -50,12 +53,14 @@
 </MudContainer>
 
 @code {
-    private List<MediaCollectionViewModel> _data;
+    private MudTable<MediaCollectionViewModel> _table;
 
-    protected override Task OnParametersSetAsync() => RefreshData();
+    protected override async Task OnAfterRenderAsync(bool firstRender)
-
+    {
-    private async Task RefreshData() =>
+        int rowsPerPage = await LocalStorage.GetItemAsync<int?>("pages.collections.rows_per_page") ?? 10;
-        _data = await Mediator.Send(new GetAllCollections()).Map(list => list.OrderBy(vm => vm.Name).ToList());
+        _table.RowsPerPage = rowsPerPage;
+        await _table.ReloadServerData();
+    }
 
     private async Task DeleteMediaCollection(MediaCardViewModel vm)
     {
@@ -69,9 +74,18 @@
             if (!result.Cancelled)
             {
                 await Mediator.Send(new DeleteCollection(collection.Id));
-                await RefreshData();
+                await _table.ReloadServerData();
             }
         }
     }
 
+
+    private async Task<TableData<MediaCollectionViewModel>> ServerReload(TableState state)
+    {
+        await LocalStorage.SetItemAsync<int?>("pages.collections.rows_per_page", state.PageSize);
+
+        PagedMediaCollectionsViewModel data = await Mediator.Send(new GetPagedCollections(state.Page, state.PageSize));
+        return new TableData<MediaCollectionViewModel> { TotalItems = data.TotalCount, Items = data.Page };
+    }
+
 }

ErsatzTV/Startup.cs

@@ -3,6 +3,7 @@ using System.Data;
 using System.IO;
 using System.Reflection;
 using System.Threading.Channels;
+using Blazored.LocalStorage;
 using Dapper;
 using ErsatzTV.Application;
 using ErsatzTV.Application.Channels.Queries;
@@ -90,6 +91,7 @@ namespace ErsatzTV
 
             services.AddMudServices();
             services.AddCourier(Assembly.GetAssembly(typeof(LibraryScanProgress)));
+            services.AddBlazoredLocalStorage();
 
             Log.Logger.Information(
                 "ErsatzTV version {Version}",