fix(transformation): Fix the problem where the file field is empty af…

…ter asset transformation

the sync tool was not able to process assets correctly due to a wrong transformation done the asset

closes #68

lib/transform/transformers.js

@@ -1,6 +1,5 @@
 import { omit, pick } from 'lodash/object'
 import { find, reduce } from 'lodash/collection'
-
 /**
  * Default transformer methods for each kind of entity.
  *
@@ -17,17 +16,19 @@ export function entries (entry) {
 }
 
 export function assets (asset) {
-  asset.fields = pick(asset.fields, 'title', 'description')
-  asset.fields.file = reduce(
+  const transformedAsset = omit(asset, 'sys')
+  transformedAsset.sys = pick(asset.sys, 'id')
+  transformedAsset.fields = pick(asset.fields, 'title', 'description')
+  transformedAsset.fields.file = reduce(
     asset.fields.file,
-    (newFile, file, locale) => {
-      newFile[locale] = omit(file, 'url', 'details')
-      newFile[locale].upload = 'https:' + file.url
-      return newFile
-    },
-    {}
-  )
-  return asset
+     (newFile, file, locale) => {
+       newFile[locale] = omit(file, 'url', 'details')
+       newFile[locale].upload = 'http:' + file.url
+       return newFile
+     },
+     {}
+   )
+  return transformedAsset
 }
 
 export function locales (locale, destinationLocales) {