Moved resolving inverse relationships to configuration phase.

Author: Bart Koelman

src/JsonApiDotNetCore/Builders/JsonApiApplicationBuilder.cs

@@ -62,16 +62,22 @@ public void ConfigureMvc(Type dbContextType)
         {
             RegisterJsonApiStartupServices();
 
-            var intermediateProvider = _services.BuildServiceProvider();
-            _resourceGraphBuilder = intermediateProvider.GetRequiredService<IResourceGraphBuilder>();
-            _serviceDiscoveryFacade = intermediateProvider.GetRequiredService<IServiceDiscoveryFacade>();
-            _dbContextType = dbContextType;
+            IJsonApiExceptionFilterProvider exceptionFilterProvider;
+            IJsonApiTypeMatchFilterProvider typeMatchFilterProvider;
+            IJsonApiRoutingConvention routingConvention;
 
-            AddResourceTypesFromDbContext(intermediateProvider);
+            using (var intermediateProvider = _services.BuildServiceProvider())
+            {
+                _resourceGraphBuilder = intermediateProvider.GetRequiredService<IResourceGraphBuilder>();
+                _serviceDiscoveryFacade = intermediateProvider.GetRequiredService<IServiceDiscoveryFacade>();
+                _dbContextType = dbContextType;
+
+                AddResourceTypesFromDbContext(intermediateProvider);
 
-            var exceptionFilterProvider = intermediateProvider.GetRequiredService<IJsonApiExceptionFilterProvider>();
-            var typeMatchFilterProvider = intermediateProvider.GetRequiredService<IJsonApiTypeMatchFilterProvider>();
-            var routingConvention = intermediateProvider.GetRequiredService<IJsonApiRoutingConvention>();
+                exceptionFilterProvider = intermediateProvider.GetRequiredService<IJsonApiExceptionFilterProvider>();
+                typeMatchFilterProvider = intermediateProvider.GetRequiredService<IJsonApiTypeMatchFilterProvider>();
+                routingConvention = intermediateProvider.GetRequiredService<IJsonApiRoutingConvention>();
+            }
 
             _mvcBuilder.AddMvcOptions(options =>
             {

src/JsonApiDotNetCore/Extensions/ApplicationBuilderExtensions.cs

@@ -29,12 +29,6 @@ public static class ApplicationBuilderExtensions
         /// </example>
         public static void UseJsonApi(this IApplicationBuilder app, bool skipRegisterMiddleware = false, bool useAuthentication = false, bool useAuthorization = false)
         {
-            using (var scope = app.ApplicationServices.CreateScope())
-            {
-                var inverseRelationshipResolver = scope.ServiceProvider.GetService<IInverseRelationships>();
-                inverseRelationshipResolver?.Resolve();
-            }
-
             if (!skipRegisterMiddleware) 
             {
                 // An endpoint is selected and set on the HttpContext if a match is found

src/JsonApiDotNetCore/Extensions/ServiceCollectionExtensions.cs

@@ -26,6 +26,8 @@ public static IServiceCollection AddJsonApi(this IServiceCollection services,
             IMvcCoreBuilder mvcBuilder = null)
         {
             SetupApplicationBuilder(services, options, discovery, resources, mvcBuilder, null);
+            ResolveInverseRelationships(services);
+
             return services;
         }
 
@@ -40,6 +42,8 @@ public static IServiceCollection AddJsonApi<TDbContext>(this IServiceCollection
             where TDbContext : DbContext
         {
             SetupApplicationBuilder(services, options, discovery, resources, mvcBuilder, typeof(TDbContext));
+            ResolveInverseRelationships(services);
+
             return services;
         }
 
@@ -56,6 +60,15 @@ private static void SetupApplicationBuilder(IServiceCollection services, Action<
             applicationBuilder.ConfigureServices();
         }
 
+        private static void ResolveInverseRelationships(IServiceCollection services)
+        {
+            using var intermediateProvider = services.BuildServiceProvider();
+            using var scope = intermediateProvider.CreateScope();
+
+            var inverseRelationshipResolver = scope.ServiceProvider.GetService<IInverseRelationships>();
+            inverseRelationshipResolver?.Resolve();
+        }
+
         /// <summary>
         /// Enables client serializers for sending requests and receiving responses
         /// in json:api format. Internally only used for testing.