Just changes.

imports/api/locations.js

@@ -12,5 +12,29 @@ Locations.allow({
 });
 
 Meteor.methods({
+    async 'add.location' (locName, locDesc, locTypeName, locTypeId, isChild, parentName, parentId) {
+        check(locName, String);
+        check(locDesc, String);
+        check(locTypeName, String);
+        check(locTypeId, String);
+        check(isChild, Boolean);
+        check(parentName, String);
+        check(parentId, String);
 
+        if (!this.userId) {
+            throw new Meteor.Error('You are not allowed to add locations. Make sure you are logged in with valid user credentials.');
+        }
+                
+        return await Locations.insertAsync({
+            locationName: locName,
+            locationDesc: locDesc,
+            locationTypeName: locTypeName,
+            locationTypeId: locTypeId,
+            isChild: isChild,
+            parentName: parentName,
+            parentId: parentId,
+            addedOn: new Date(),
+            addedBy: this.userId,
+        });
+    },
 });