fix: Add check if model dependency is string (#3)

Co-authored-by: Filipe <filipe.pacheco@mercury.co.nz>

Author: mingchuno

src/models.js

@@ -63,7 +63,9 @@ module.exports = {
 
   addModelDependencies: function addModelDependencies(models, resource) {
     Object.keys(models).forEach(contentType => {
-      resource.DependsOn.add(`${models[contentType]}Model`);
+      if (typeof models[contentType] === 'string') {
+        resource.DependsOn.add(`${models[contentType]}Model`);
+      }
     });
   },