From 20e8b93c15a9d3e5070d8edff99b12bd1b3784a6 Mon Sep 17 00:00:00 2001
From: Frans Saris <frans@beech.it>
Date: Fri, 20 Sep 2019 16:01:31 +0200
Subject: [PATCH] [BUGFIX] #244 Fix removing belongsTo relations

---
 src/services/json-api-datastore.service.ts | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/services/json-api-datastore.service.ts b/src/services/json-api-datastore.service.ts
index 3c0493c3..3f729eb0 100644
--- a/src/services/json-api-datastore.service.ts
+++ b/src/services/json-api-datastore.service.ts
@@ -246,6 +246,16 @@ export class JsonApiDatastore {
               data: relationshipData
             };
           }
+        }  else if (data[key] === null) {
+          const entity = belongsToMetadata.find((entity: any) => entity.propertyName === key);
+
+          if (entity) {
+            relationships = relationships || {};
+
+            relationships[entity.relationship] = {
+              data: null
+            };
+          }
         }
       }
     }
@@ -448,7 +458,7 @@ export class JsonApiDatastore {
     const modelsTypes: any = Reflect.getMetadata('JsonApiDatastoreConfig', this.constructor).models;
 
     for (const relationship in relationships) {
-      if (relationships.hasOwnProperty(relationship) && model.hasOwnProperty(relationship)) {
+      if (relationships.hasOwnProperty(relationship) && model.hasOwnProperty(relationship) && model[relationship]) {
         const relationshipModel: JsonApiModel = model[relationship];
         const hasMany: any[] = Reflect.getMetadata('HasMany', relationshipModel);
         const propertyHasMany: any = find(hasMany, (property) => {