fix: unwind of nested fields (#357)

Author: juanjoDiaz

lib/JSON2CSVBase.js

@@ -2,7 +2,13 @@
 
 const os = require('os');
 const lodashGet = require('lodash.get');
-const lodashSet = require('lodash.set');
+
+const setProp = (obj, path, value) => {
+  const pathArray = Array.isArray(path) ? path : path.split('.');
+  const key = pathArray[0];
+  const newValue = pathArray.length > 1 ? setProp(obj[key] || {}, pathArray.slice(1), value) : value;
+  return Object.assign({}, obj, { [key]: newValue });
+};
 
 class JSON2CSVBase {
   constructor(opts) {
@@ -255,15 +261,6 @@ class JSON2CSVBase {
   */
   unwindData(dataRow, unwindPaths) {
     const unwind = (rows, unwindPath) => {
-      const pathAndField = unwindPath.split(/\.(?=[^.]+$)/);
-      const setUnwoundValue = pathAndField.length === 2
-        ? (() => {
-          const parentPath = pathAndField[0];
-          const unwindField = pathAndField[1];
-          return (row, value) => lodashSet(Object.assign({}, row), parentPath, Object.assign({}, lodashGet(row, parentPath), { [unwindField]: value }));
-        })()
-        : (row, value) => Object.assign({}, row, { [unwindPath]: value });
-
       return rows
         .map(row => {
           const unwindArray = lodashGet(row, unwindPath);
@@ -273,15 +270,15 @@ class JSON2CSVBase {
           }
 
           if (!unwindArray.length) {
-            return setUnwoundValue(row, undefined);
+            return setProp(row, unwindPath, undefined);
           }
 
           return unwindArray.map((unwindRow, index) => {
             const clonedRow = (this.opts.unwindBlank && index > 0)
               ? {}
               : row;
 
-            return setUnwoundValue(clonedRow, unwindRow);
+            return setProp(clonedRow, unwindPath, unwindRow);
           });
         })
         .reduce((a, e) => a.concat(e), []);