Merge pull request #1753 from anandpdoshi/fix/data-import-nestedset-sorting

[fix] Data Import Template with Data: Sort by  when nested set model

frappe/core/page/data_import_tool/data_import_tool.json

@@ -1,20 +1,19 @@
 {
- "creation": "2012-06-14 15:07:25.000000", 
+ "content": null, 
+ "creation": "2012-06-14 15:07:25", 
  "docstatus": 0, 
  "doctype": "Page", 
  "icon": "icon-upload", 
  "idx": 1, 
- "modified": "2014-02-13 16:09:27.000000", 
+ "modified": "2016-05-11 03:37:53.385693", 
  "modified_by": "Administrator", 
  "module": "Core", 
  "name": "data-import-tool", 
  "owner": "Administrator", 
  "page_name": "data-import-tool", 
- "roles": [
-  {
-   "role": "System Manager"
-  }
- ], 
+ "roles": [], 
+ "script": null, 
  "standard": "Yes", 
+ "style": null, 
  "title": "Data Import Tool"
 }

frappe/core/page/data_import_tool/exporter.py

@@ -177,8 +177,15 @@ def get_template(doctype=None, parent_doctype=None, all_doctypes="No", with_data
 		if with_data=='Yes':
 			frappe.permissions.can_export(parent_doctype, raise_exception=True)
 
+			# sort nested set doctypes by `lft asc`
+			order_by = None
+			table_columns = frappe.db.get_table_columns(parent_doctype)
+			if 'lft' in table_columns and 'rgt' in table_columns:
+				order_by = '`tab{doctype}`.`lft` asc'.format(doctype=parent_doctype)
+
 			# get permitted data only
-			data = frappe.get_list(doctype, fields=["*"], limit_page_length=None)
+			data = frappe.get_list(doctype, fields=["*"], limit_page_length=None, order_by=order_by)
+
 			for doc in data:
 				op = docs_to_export.get("op")
 				names = docs_to_export.get("name")