Fix sparse fields with DefaultEntityRepository.Get() override

JsonApiDotnetCore.sln

@@ -190,7 +190,7 @@ Global
 		{6DFA30D7-1679-4333-9779-6FB678E48EF5}.Release|x64.ActiveCfg = Release|Any CPU
 		{6DFA30D7-1679-4333-9779-6FB678E48EF5}.Release|x64.Build.0 = Release|Any CPU
 		{6DFA30D7-1679-4333-9779-6FB678E48EF5}.Release|x86.ActiveCfg = Release|Any CPU
-		{6DFA30D7-1679-4333-9779-6FB678E48EF5}.Release|x86.Build.0 = Release|Any CPU\
+		{6DFA30D7-1679-4333-9779-6FB678E48EF5}.Release|x86.Build.0 = Release|Any CPU
 		{09C0C8D8-B721-4955-8889-55CB149C3B5C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{09C0C8D8-B721-4955-8889-55CB149C3B5C}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{09C0C8D8-B721-4955-8889-55CB149C3B5C}.Debug|x64.ActiveCfg = Debug|Any CPU
@@ -203,6 +203,7 @@ Global
 		{09C0C8D8-B721-4955-8889-55CB149C3B5C}.Release|x64.Build.0 = Release|Any CPU
 		{09C0C8D8-B721-4955-8889-55CB149C3B5C}.Release|x86.ActiveCfg = Release|Any CPU
 		{09C0C8D8-B721-4955-8889-55CB149C3B5C}.Release|x86.Build.0 = Release|Any CPU
+		{DF9BFD82-D937-4907-B0B4-64670417115F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

src/JsonApiDotNetCore/Data/DefaultEntityRepository.cs

@@ -78,7 +78,8 @@ public DefaultEntityRepository(
             _resourceDefinition = resourceDefinition;
         }
 
-        /// <inheritdoc />
+
+
         public virtual IQueryable<TEntity> Get()
         {
             if (_jsonApiContext.QuerySet?.Fields != null && _jsonApiContext.QuerySet.Fields.Count > 0)
@@ -87,6 +88,18 @@ public virtual IQueryable<TEntity> Get()
             return _dbSet;
         }
 
+        /// <inheritdoc />
+        public virtual IQueryable<TEntity> GetQueryable() 
+            => _dbSet;
+
+        public virtual IQueryable<TEntity> Select(IQueryable<TEntity> entities, List<string> fields)
+        {
+            if (fields?.Count > 0)
+                return entities.Select(fields);
+
+            return entities;
+        }
+
         /// <inheritdoc />
         public virtual IQueryable<TEntity> Filter(IQueryable<TEntity> entities, FilterQuery filterQuery)
         {
@@ -127,15 +140,15 @@ public virtual IQueryable<TEntity> Sort(IQueryable<TEntity> entities, List<SortQ
         /// <inheritdoc />
         public virtual async Task<TEntity> GetAsync(TId id)
         {
-            return await Get().SingleOrDefaultAsync(e => e.Id.Equals(id));
+            return await GetQueryable().SingleOrDefaultAsync(e => e.Id.Equals(id));
         }
 
         /// <inheritdoc />
         public virtual async Task<TEntity> GetAndIncludeAsync(TId id, string relationshipName)
         {
             _logger?.LogDebug($"[JADN] GetAndIncludeAsync({id}, {relationshipName})");
 
-            var includedSet = Include(Get(), relationshipName);
+            var includedSet = Include(GetQueryable(), relationshipName);
             var result = await includedSet.SingleOrDefaultAsync(e => e.Id.Equals(id));
 
             return result;

src/JsonApiDotNetCore/Data/IEntityReadRepository.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
@@ -18,8 +19,16 @@ public interface IEntityReadRepository<TEntity, in TId>
         /// The base GET query. This is a good place to apply rules that should affect all reads, 
         /// such as authorization of resources.
         /// </summary>
+        IQueryable<TEntity> GetQueryable();
+
+        [Obsolete("This method has been deprecated, use GetQueryable() instead")]
         IQueryable<TEntity> Get();
 
+        /// <summary>
+        /// Apply fields to the provided queryable
+        /// </summary>
+        IQueryable<TEntity> Select(IQueryable<TEntity> entities,List<string> fields);
+
         /// <summary>
         /// Include a relationship in the query
         /// </summary>

src/JsonApiDotNetCore/Services/EntityResourceService.cs

@@ -98,7 +98,7 @@ public virtual async Task<bool> DeleteAsync(TId id)
 
         public virtual async Task<IEnumerable<TResource>> GetAsync()
         {
-            var entities = _entities.Get();
+            var entities = _entities.GetQueryable();
 
             entities = ApplySortAndFilterQuery(entities);
 
@@ -108,6 +108,9 @@ public virtual async Task<IEnumerable<TResource>> GetAsync()
             if (_jsonApiContext.Options.IncludeTotalRecordCount)
                 _jsonApiContext.PageManager.TotalRecords = await _entities.CountAsync(entities);
 
+            if (_jsonApiContext.QuerySet?.Fields?.Count > 0)
+                entities = _entities.Select(entities, _jsonApiContext.QuerySet.Fields);
+
             // pagination should be done last since it will execute the query
             var pagedEntities = await ApplyPageQueryAsync(entities);
             return pagedEntities;
@@ -240,7 +243,7 @@ protected virtual IQueryable<TEntity> IncludeRelationships(IQueryable<TEntity> e
 
         private async Task<TResource> GetWithRelationshipsAsync(TId id)
         {
-            var query = _entities.Get().Where(e => e.Id.Equals(id));
+            var query = _entities.GetQueryable().Where(e => e.Id.Equals(id));
 
             _jsonApiContext.QuerySet.IncludedRelationships.ForEach(r =>
             {

test/DiscoveryTests/ServiceDiscoveryFacadeTests.cs

@@ -1,4 +1,3 @@
-using System;
 using GettingStarted.Models;
 using GettingStarted.ResourceDefinitionExample;
 using JsonApiDotNetCore.Builders;
@@ -7,7 +6,6 @@
 using JsonApiDotNetCore.Models;
 using JsonApiDotNetCore.Services;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Logging;
 using Moq;
 using Xunit;
 

test/JsonApiDotNetCoreExampleTests/Acceptance/Extensibility/RepositoryOverrideTests.cs

@@ -61,5 +61,42 @@ public async Task Total_Record_Count_Included()
             foreach(var item in deserializedBody)
                 Assert.Equal(person.Id, item.OwnerId);
         }
+
+        [Fact]
+        public async Task Sparse_Fields_Works_With_Get_Override()
+        {
+            // arrange
+            var builder = new WebHostBuilder()
+                .UseStartup<AuthorizedStartup>();
+            var server = new TestServer(builder);
+            var client = server.CreateClient();
+            var context = (AppDbContext)server.Host.Services.GetService(typeof(AppDbContext));
+            var jsonApiContext = (IJsonApiContext)server.Host.Services.GetService(typeof(IJsonApiContext));
+
+            var person = new Person();
+            context.People.Add(person);
+            var todoItem = new TodoItem();
+            todoItem.Owner = person;
+            context.TodoItems.Add(todoItem);
+            context.SaveChanges();
+
+            var authService = (IAuthorizationService)server.Host.Services.GetService(typeof(IAuthorizationService));
+            authService.CurrentUserId = person.Id;
+
+            var httpMethod = new HttpMethod("GET");
+            var route = $"/api/v1/todo-items/{todoItem.Id}?fields[todo-items]=description";
+
+            var request = new HttpRequestMessage(httpMethod, route);
+
+            // act
+            var response = await client.SendAsync(request);
+            var responseBody = await response.Content.ReadAsStringAsync();
+            var deserializedBody = _fixture.GetService<IJsonApiDeSerializer>().Deserialize<TodoItem>(responseBody);
+
+            // assert
+            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+            Assert.Equal(todoItem.Description, deserializedBody.Description);
+
+        }
     }
 }

test/JsonApiDotNetCoreExampleTests/Helpers/Repositories/AuthorizedTodoItemsRepository.cs

@@ -23,9 +23,9 @@ public AuthorizedTodoItemsRepository(
             _authService = authService;
         }
 
-        public override IQueryable<TodoItem> Get()
+        public override IQueryable<TodoItem> GetQueryable()
         {
-            return base.Get().Where(todoItem => todoItem.OwnerId == _authService.CurrentUserId);
+            return base.GetQueryable().Where(todoItem => todoItem.OwnerId == _authService.CurrentUserId);
         }
     }
 }