Allow attributes not specified in entity to be passed through

Author: omichowdhury

__tests__/formatItem.unit.test.js

@@ -83,4 +83,9 @@ describe('formatItem', () => {
     expect(result).toEqual({ linked1: 'test1' })
   })
 
+  it('passes through attribute not specified in entity', () => {
+    let result = formatItem(DocumentClient)(DefaultTable.User.schema.attributes,DefaultTable.User.linked,{ unspecified: 'value' })  
+    expect(result).toEqual({ unspecified: 'value' })
+  })
+
 })

lib/formatItem.js

@@ -19,7 +19,7 @@ module.exports = (DocumentClient) => (attributes,linked,item,include=[]) => {
 
   return Object.keys(item).reduce((acc,field) => {
 
-    if (linked[field] || linked[attributes[field].alias]) {
+    if (linked[field] || attributes[field] && linked[attributes[field]] && linked[attributes[field]].alias) {
       Object.assign(acc, (linked[field] || linked[attributes[field].alias]).reduce((acc,f,i) => {
         if (attributes[f].save || attributes[f].hidden || (include.length > 0 && !include.includes(f))) return acc    
         return Object.assign(acc,{
@@ -38,7 +38,7 @@ module.exports = (DocumentClient) => (attributes,linked,item,include=[]) => {
     if (attributes[field] && attributes[field].type === 'set' && Array.isArray(item[field].values)) { item[field] = item[field].values } 
     return Object.assign(acc,{
       [(attributes[field] && attributes[field].alias) || field]: (
-        attributes[field].prefix || attributes[field].suffix
+        attributes[field] && (attributes[field].prefix || attributes[field].suffix)
           ? item[field]
             .replace(new RegExp(`^${escapeRegExp(attributes[field].prefix)}`),'')
             .replace(new RegExp(`${escapeRegExp(attributes[field].suffix)}$`),'')