Fixing issue where total-records was 0 on POST and PATCH calls.

src/JsonApiDotNetCore/Builders/DocumentBuilder.cs

@@ -68,21 +68,20 @@ public Documents Build(IEnumerable<IIdentifiable> entities)
 
         private Dictionary<string, object> GetMeta(IIdentifiable entity)
         {
-            if (entity == null) return null;
-
             var builder = _jsonApiContext.MetaBuilder;
-
-            if (entity is IHasMeta metaEntity)
-                builder.Add(metaEntity.GetMeta(_jsonApiContext));
-
-            if (_jsonApiContext.Options.IncludeTotalRecordCount)
+            if (_jsonApiContext.Options.IncludeTotalRecordCount && _jsonApiContext.PageManager.TotalRecords != null)
                 builder.Add("total-records", _jsonApiContext.PageManager.TotalRecords);
 
             if (_requestMeta != null)
                 builder.Add(_requestMeta.GetMeta());
 
+            if (entity != null && entity is IHasMeta metaEntity)
+                builder.Add(metaEntity.GetMeta(_jsonApiContext));
+
             var meta = builder.Build();
-            if (meta.Count > 0) return meta;
+            if (meta.Count > 0)
+                return meta;
+
             return null;
         }
 

src/JsonApiDotNetCore/Internal/PageManager.cs

@@ -6,12 +6,12 @@ namespace JsonApiDotNetCore.Internal
 {
     public class PageManager
     {
-        public int TotalRecords { get; set; }
+        public int? TotalRecords { get; set; }
         public int PageSize { get; set; }
         public int DefaultPageSize { get; set; }
         public int CurrentPage { get; set; }
         public bool IsPaginated => PageSize > 0;
-        public int TotalPages => (TotalRecords == 0) ? -1 : (int)Math.Ceiling(decimal.Divide(TotalRecords, PageSize));
+        public int TotalPages => (TotalRecords == null) ? -1 : (int)Math.Ceiling(decimal.Divide(TotalRecords.Value, PageSize));
 
         public RootLinks GetPageLinks(LinkBuilder linkBuilder)
         {

src/JsonApiDotNetCore/JsonApiDotNetCore.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <VersionPrefix>2.3.0</VersionPrefix>
+    <VersionPrefix>2.3.1</VersionPrefix>
     <TargetFrameworks>$(NetStandardVersion)</TargetFrameworks>
     <AssemblyName>JsonApiDotNetCore</AssemblyName>
     <PackageId>JsonApiDotNetCore</PackageId>

src/JsonApiDotNetCore/Services/JsonApiContext.cs

@@ -86,20 +86,20 @@ internal static bool PathIsRelationship(string requestPath)
             const char pathSegmentDelimiter = '/';
 
             var span = requestPath.AsSpan();
-            
+
             // we need to iterate over the string, from the end,
             // checking whether or not the 2nd to last path segment
             // is "relationships"
             // -2 is chosen in case the path ends with '/'
-            for(var i = requestPath.Length - 2; i >= 0; i--)
+            for (var i = requestPath.Length - 2; i >= 0; i--)
             {
                 // if there are not enough characters left in the path to 
                 // contain "relationships"
-                if(i < relationships.Length) 
+                if (i < relationships.Length)
                     return false;
 
                 // we have found the first instance of '/'
-                if(span[i] == pathSegmentDelimiter)
+                if (span[i] == pathSegmentDelimiter)
                 {
                     // in the case of a "relationships" route, the next
                     // path segment will be "relationships"
@@ -112,7 +112,7 @@ internal static bool PathIsRelationship(string requestPath)
 
             return false;
         }
-        
+
         private PageManager GetPageManager()
         {
             if (Options.DefaultPageSize == 0 && (QuerySet == null || QuerySet.PageQuery.PageSize == 0))

test/JsonApiDotNetCoreExampleTests/Acceptance/Spec/DocumentTests/Meta.cs

@@ -1,6 +1,7 @@
 using System.Collections;
 using System.Net;
 using System.Net.Http;
+using System.Net.Http.Headers;
 using System.Threading.Tasks;
 using JsonApiDotNetCore.Models;
 using JsonApiDotNetCoreExample;
@@ -47,13 +48,123 @@ public async Task Total_Record_Count_Included()
             var response = await client.SendAsync(request);
             var responseBody = await response.Content.ReadAsStringAsync();
             var documents = JsonConvert.DeserializeObject<Documents>(responseBody);
-            
+
             // assert
             Assert.Equal(HttpStatusCode.OK, response.StatusCode);
             Assert.NotNull(documents.Meta);
             Assert.Equal((long)expectedCount, (long)documents.Meta["total-records"]);
         }
 
+        [Fact]
+        public async Task Total_Record_Count_Included_When_None()
+        {
+            // arrange
+            _context.TodoItems.RemoveRange(_context.TodoItems);
+            _context.SaveChanges();
+            var builder = new WebHostBuilder()
+                .UseStartup<MetaStartup>();
+
+            var httpMethod = new HttpMethod("GET");
+            var route = $"/api/v1/todo-items";
+
+            var server = new TestServer(builder);
+            var client = server.CreateClient();
+            var request = new HttpRequestMessage(httpMethod, route);
+
+            // act
+            var response = await client.SendAsync(request);
+            var responseBody = await response.Content.ReadAsStringAsync();
+            var documents = JsonConvert.DeserializeObject<Documents>(responseBody);
+
+            // assert
+            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+            Assert.NotNull(documents.Meta);
+            Assert.Equal(0, (long)documents.Meta["total-records"]);
+        }
+
+        [Fact]
+        public async Task Total_Record_Count_Not_Included_In_POST_Response()
+        {
+            // arrange
+            _context.TodoItems.RemoveRange(_context.TodoItems);
+            _context.SaveChanges();
+            var builder = new WebHostBuilder()
+                .UseStartup<MetaStartup>();
+
+            var httpMethod = new HttpMethod("POST");
+            var route = $"/api/v1/todo-items";
+
+            var server = new TestServer(builder);
+            var client = server.CreateClient();
+            var request = new HttpRequestMessage(httpMethod, route);
+            var content = new
+            {
+                data = new
+                {
+                    type = "todo-items",
+                    attributes = new
+                    {
+                        description = "New Description",
+                    }
+                }
+            };
+
+            request.Content = new StringContent(JsonConvert.SerializeObject(content));
+            request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/vnd.api+json");
+
+            // act
+            var response = await client.SendAsync(request);
+            var responseBody = await response.Content.ReadAsStringAsync();
+            var documents = JsonConvert.DeserializeObject<Document>(responseBody);
+
+            // assert
+            Assert.Equal(HttpStatusCode.Created, response.StatusCode);
+            Assert.False(documents.Meta.ContainsKey("total-records"));
+        }
+
+        [Fact]
+        public async Task Total_Record_Count_Not_Included_In_PATCH_Response()
+        {
+            // arrange
+            _context.TodoItems.RemoveRange(_context.TodoItems);
+            TodoItem todoItem = new TodoItem();
+            _context.TodoItems.Add(todoItem);
+            _context.SaveChanges();
+            var builder = new WebHostBuilder()
+                .UseStartup<MetaStartup>();
+
+            var httpMethod = new HttpMethod("PATCH");
+            var route = $"/api/v1/todo-items/{todoItem.Id}";
+
+            var server = new TestServer(builder);
+            var client = server.CreateClient();
+            var request = new HttpRequestMessage(httpMethod, route);
+            var content = new
+            {
+                data = new
+                {
+                    type = "todo-items",
+                    id = todoItem.Id,
+                    attributes = new
+                    {
+                        description = "New Description",
+                    }
+                }
+            };
+
+            request.Content = new StringContent(JsonConvert.SerializeObject(content));
+            request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/vnd.api+json");
+
+            // act
+            var response = await client.SendAsync(request);
+            var responseBody = await response.Content.ReadAsStringAsync();
+            var documents = JsonConvert.DeserializeObject<Document>(responseBody);
+
+            // assert
+            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+            Assert.False(documents.Meta.ContainsKey("total-records"));
+        }
+
         [Fact]
         public async Task EntityThatImplements_IHasMeta_Contains_MetaData()
         {
@@ -73,26 +184,26 @@ public async Task EntityThatImplements_IHasMeta_Contains_MetaData()
             // act
             var response = await client.SendAsync(request);
             var documents = JsonConvert.DeserializeObject<Documents>(await response.Content.ReadAsStringAsync());
-            
+
             // assert
             Assert.Equal(HttpStatusCode.OK, response.StatusCode);
             Assert.NotNull(documents.Meta);
             Assert.NotNull(expectedMeta);
             Assert.NotEmpty(expectedMeta);
-            
-            foreach(var hash in expectedMeta)
+
+            foreach (var hash in expectedMeta)
             {
-                if(hash.Value is IList)
+                if (hash.Value is IList)
                 {
                     var listValue = (IList)hash.Value;
-                    for(var i=0; i < listValue.Count; i++)
+                    for (var i = 0; i < listValue.Count; i++)
                         Assert.Equal(listValue[i].ToString(), ((IList)documents.Meta[hash.Key])[i].ToString());
                 }
                 else
                 {
                     Assert.Equal(hash.Value, documents.Meta[hash.Key]);
                 }
-            }                
+            }
         }
     }
 }

test/JsonApiDotNetCoreExampleTests/Acceptance/Spec/FetchingDataTests.cs

@@ -53,8 +53,10 @@ public async Task Request_ForEmptyCollection_Returns_EmptyDataCollection()
             var server = new TestServer(builder);
             var client = server.CreateClient();
             var request = new HttpRequestMessage(httpMethod, route);
-            var expectedBody = JsonConvert.SerializeObject(new {
-                data = new List<object>()
+            var expectedBody = JsonConvert.SerializeObject(new
+            {
+                data = new List<object>(),
+                meta = new Dictionary<string, int> { { "total-records", 0 } }
             });
 
             // act