visgraph: prepare PATCH relationship when submitting (wip)

src/Bundle/ChillPersonBundle/Resources/public/vuejs/VisGraph/api.js

@@ -139,10 +139,35 @@ const postRelationship = (fromPerson, toPerson, relation, reverse) => {
     )
 }
 
+/**
+ * @function patchRelationship
+ * @param relationship
+ * @returns {Promise<Response>}
+ */
+const patchRelationship = (relationship) => {
+    return patchFetch(
+        `/api/1.0/relations/relationship/${relationship._id}.json`,
+        {
+            type: 'relationship',
+            fromPerson: { type: 'person',
+                id: fromPerson._id
+            },
+            toPerson: { type: 'person',
+                id: toPerson._id
+            },
+            relation: { type: 'relation',
+                id: relation.id
+            },
+            reverse: reverse
+        }
+    )
+}
+
 export {
     getHouseholdByPerson,
     getCoursesByPerson,
     getRelationshipsByPerson,
     getRelationsList,
     postRelationship,
+    patchRelationship
 }