first pass at setting relationship Id on POST

Author: jaredcnance

JsonApiDotNetCore/Abstractions/ModelAccessor.cs

@@ -4,6 +4,7 @@
 using System.Reflection;
 using JsonApiDotNetCore.Extensions;
 using JsonApiDotNetCore.JsonApi;
+using Newtonsoft.Json.Linq;
 
 namespace JsonApiDotNetCore.Abstractions
 {
@@ -21,7 +22,7 @@ public static Type GetTypeFromModelRelationshipName(Type modelType, string relat
       return relationshipType;
     }
 
-    public static object SetValuesOnModelInstance(object model, Dictionary<string, object> jsonApiAttributes)
+    public static object SetValuesOnModelInstance(object model, Dictionary<string, object> jsonApiAttributes, Dictionary<string, object> jsonApiRelationships)
     {
       var modelProperties = model.GetType().GetProperties().ToList();
       foreach (var attribute in jsonApiAttributes)
@@ -35,6 +36,23 @@ public static object SetValuesOnModelInstance(object model, Dictionary<string, o
           }
         });
       }
+
+      foreach (var relationship in jsonApiRelationships)
+      {
+        var relationshipName = relationship.Key;
+        var relationshipId = ((JObject) relationship.Value)["data"]["id"];
+        var relationshipPropertyName = $"{relationshipName}Id";
+
+        modelProperties.ForEach(pI =>
+        {
+          if (pI.Name.ToProperCase() == relationshipPropertyName.ToProperCase())
+          {
+            var convertedValue = Convert.ChangeType(relationshipId, pI.PropertyType);
+            pI.SetValue(model, convertedValue);
+          }
+        });
+      }
+
       return model;
     }
   }

JsonApiDotNetCore/Services/JsonApiDeserializer.cs

@@ -21,7 +21,10 @@ public object GetEntityFromRequest()
       var body = GetRequestBody(_context.HttpContext.Request.Body);
       var document = JsonConvert.DeserializeObject<JsonApiDocument>(body);
       var entity = Activator.CreateInstance(_context.GetEntityType());
-      return ModelAccessor.SetValuesOnModelInstance(entity, ((JsonApiDatum)((JObject)document.Data).ToObject(typeof(JsonApiDatum))).Attributes);
+      var datum = ((JsonApiDatum) ((JObject) document.Data).ToObject(typeof(JsonApiDatum)));
+      var attributes = datum.Attributes;
+      var relationships = datum.Relationships;
+      return ModelAccessor.SetValuesOnModelInstance(entity, attributes, relationships);
     }
 
     private static string GetRequestBody(Stream body)