Added tests for multi-tenancy

Author: Bart Koelman

src/JsonApiDotNetCore/Services/JsonApiResourceService.cs

@@ -201,7 +201,7 @@ public virtual async Task<TResource> CreateAsync(TResource resource, Cancellatio
 
             _resourceChangeTracker.SetInitiallyStoredAttributeValues(resourceForDatabase);
 
-            await _resourceDefinitionAccessor.OnInitializeResourceAsync(resourceForDatabase, cancellationToken);
+            await InitializeResourceAsync(resourceForDatabase, cancellationToken);
 
             try
             {
@@ -243,6 +243,11 @@ public virtual async Task<TResource> CreateAsync(TResource resource, Cancellatio
             return resourceFromDatabase;
         }
 
+        protected virtual async Task InitializeResourceAsync(TResource resourceForDatabase, CancellationToken cancellationToken)
+        {
+            await _resourceDefinitionAccessor.OnInitializeResourceAsync(resourceForDatabase, cancellationToken);
+        }
+
         protected async Task AssertResourcesToAssignInRelationshipsExistAsync(TResource primaryResource, CancellationToken cancellationToken)
         {
             var missingResources = new List<MissingResourceInRelationship>();

test/JsonApiDotNetCoreExampleTests/IntegrationTests/MultiTenancy/FakeTenantProvider.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace JsonApiDotNetCoreExampleTests.IntegrationTests.MultiTenancy
+{
+    internal sealed class FakeTenantProvider : ITenantProvider
+    {
+        public Guid TenantId { get; }
+
+        public FakeTenantProvider(Guid tenantId)
+        {
+            // A real implementation would be registered at request scope and obtain the tenant ID from the request, for example
+            // from the incoming authentication token, a custom HTTP header, the route or a query string parameter.
+
+            TenantId = tenantId;
+        }
+    }
+}

test/JsonApiDotNetCoreExampleTests/IntegrationTests/MultiTenancy/IHasTenant.cs

@@ -0,0 +1,11 @@
+using System;
+using JetBrains.Annotations;
+
+namespace JsonApiDotNetCoreExampleTests.IntegrationTests.MultiTenancy
+{
+    [UsedImplicitly(ImplicitUseTargetFlags.Members)]
+    public interface IHasTenant
+    {
+        Guid TenantId { get; set; }
+    }
+}

test/JsonApiDotNetCoreExampleTests/IntegrationTests/MultiTenancy/ITenantProvider.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace JsonApiDotNetCoreExampleTests.IntegrationTests.MultiTenancy
+{
+    public interface ITenantProvider
+    {
+        Guid TenantId { get; }
+    }
+}

test/JsonApiDotNetCoreExampleTests/IntegrationTests/MultiTenancy/MultiTenancyDbContext.cs

@@ -0,0 +1,36 @@
+using JetBrains.Annotations;
+using Microsoft.EntityFrameworkCore;
+
+// @formatter:wrap_chained_method_calls chop_always
+
+namespace JsonApiDotNetCoreExampleTests.IntegrationTests.MultiTenancy
+{
+    [UsedImplicitly(ImplicitUseTargetFlags.Members)]
+    public sealed class MultiTenancyDbContext : DbContext
+    {
+        private readonly ITenantProvider _tenantProvider;
+
+        public DbSet<WebShop> WebShops { get; set; }
+        public DbSet<WebProduct> WebProducts { get; set; }
+
+        public MultiTenancyDbContext(DbContextOptions<MultiTenancyDbContext> options, ITenantProvider tenantProvider)
+            : base(options)
+        {
+            _tenantProvider = tenantProvider;
+        }
+
+        protected override void OnModelCreating(ModelBuilder builder)
+        {
+            builder.Entity<WebShop>()
+                .HasMany(webShop => webShop.Products)
+                .WithOne(webProduct => webProduct.Shop)
+                .IsRequired();
+
+            builder.Entity<WebShop>()
+                .HasQueryFilter(webShop => webShop.TenantId == _tenantProvider.TenantId);
+
+            builder.Entity<WebProduct>()
+                .HasQueryFilter(webProduct => webProduct.Shop.TenantId == _tenantProvider.TenantId);
+        }
+    }
+}

test/JsonApiDotNetCoreExampleTests/IntegrationTests/MultiTenancy/MultiTenancyFakers.cs

@@ -0,0 +1,26 @@
+using System;
+using Bogus;
+using TestBuildingBlocks;
+
+// @formatter:wrap_chained_method_calls chop_always
+// @formatter:keep_existing_linebreaks true
+
+namespace JsonApiDotNetCoreExampleTests.IntegrationTests.MultiTenancy
+{
+    internal sealed class MultiTenancyFakers : FakerContainer
+    {
+        private readonly Lazy<Faker<WebShop>> _lazyWebShopFaker = new Lazy<Faker<WebShop>>(() =>
+            new Faker<WebShop>()
+                .UseSeed(GetFakerSeed())
+                .RuleFor(webShop => webShop.Url, faker => faker.Internet.Url()));
+
+        private readonly Lazy<Faker<WebProduct>> _lazyWebProductFaker = new Lazy<Faker<WebProduct>>(() =>
+            new Faker<WebProduct>()
+                .UseSeed(GetFakerSeed())
+                .RuleFor(webProduct => webProduct.Name, faker => faker.Commerce.ProductName())
+                .RuleFor(webProduct => webProduct.Price, faker => faker.Finance.Amount()));
+
+        public Faker<WebShop> WebShop => _lazyWebShopFaker.Value;
+        public Faker<WebProduct> WebProduct => _lazyWebProductFaker.Value;
+    }
+}