feat(relationship-attr): make setValue abstract

allows setting of has-one relationship by Id

Author: jaredcnance

src/JsonApiDotNetCore/Models/HasManyAttribute.cs

@@ -1,4 +1,4 @@
-using System;
+using System.Reflection;
 
 namespace JsonApiDotNetCore.Models
 {
@@ -9,5 +9,14 @@ public HasManyAttribute(string publicName)
         {
             PublicRelationshipName = publicName;
         }
+
+        public override void SetValue(object entity, object newValue)
+        {
+            var propertyInfo = entity
+                .GetType()
+                .GetProperty(InternalRelationshipName);
+            
+            propertyInfo.SetValue(entity, newValue);        
+        }
     }
 }

src/JsonApiDotNetCore/Models/HasOneAttribute.cs

@@ -1,3 +1,5 @@
+using System.Reflection;
+
 namespace JsonApiDotNetCore.Models
 {
     public class HasOneAttribute : RelationshipAttribute
@@ -7,5 +9,18 @@ public HasOneAttribute(string publicName)
         {
             PublicRelationshipName = publicName;
         }
+
+        public override void SetValue(object entity, object newValue)
+        {
+            var propertyName = (newValue.GetType() == Type) 
+                ? InternalRelationshipName 
+                : $"{InternalRelationshipName}Id";
+                
+            var propertyInfo = entity
+                .GetType()
+                .GetProperty(propertyName);
+            
+            propertyInfo.SetValue(entity, newValue);
+        }
     }
 }

src/JsonApiDotNetCore/Models/RelationshipAttribute.cs

@@ -1,9 +1,8 @@
 using System;
-using System.Reflection;
 
 namespace JsonApiDotNetCore.Models
 {
-    public class RelationshipAttribute : Attribute
+    public abstract class RelationshipAttribute : Attribute
     {
         protected RelationshipAttribute(string publicName)
         {
@@ -16,13 +15,6 @@ protected RelationshipAttribute(string publicName)
         public bool IsHasMany { get { return this.GetType() == typeof(HasManyAttribute); } }
         public bool IsHasOne { get { return this.GetType() == typeof(HasOneAttribute); } }
 
-        public void SetValue(object entity, object newValue)
-        {
-            var propertyInfo = entity
-                .GetType()
-                .GetProperty(InternalRelationshipName);
-            
-            propertyInfo.SetValue(entity, newValue);        
-        }
+        public abstract void SetValue(object entity, object newValue);
     }
 }