Correctness of File attachment on child table row

Why this is a good first issue

The issue involves fixing file attachment references in child tables which requires modifying the File doctype.

AI Summary

The problem is that file attachments in child tables lose their backward reference to the parent row. The solution involves adding new fields to the File doctype to maintain these references. The main blocker is ensuring the changes don't break existing functionality.

Issue Description

Information about bug

This image is a background image which is already linked in the Web-page. Since it needs to show in the website, it cannot be private, hence trying to chance it to public

Module

other

Version

version 15 all

Installation method

FrappeCloud

Relevant log output / Stack trace / Full Error Message.

### App Versions

{
	"erpnext": "15.0.0",
	"frappe": "15.1.0",
	"hrms": "15.2.0"
}

Route

Form/File/0bc47a91f8

Traceback

Traceback (most recent call last):
  File "apps/frappe/frappe/app.py", line 110, in application
    response = frappe.api.handle(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/api/__init__.py", line 49, in handle
    data = endpoint(**arguments)
           ^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/api/v1.py", line 36, in handle_rpc_call
    return frappe.handler.handle()
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/handler.py", line 49, in handle
    data = execute_cmd(cmd)
           ^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/handler.py", line 85, in execute_cmd
    return frappe.call(method, **frappe.form_dict)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/__init__.py", line 1683, in call
    return fn(*args, **newargs)
           ^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/utils/typing_validations.py", line 31, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/desk/form/save.py", line 39, in savedocs
    doc.save()
  File "apps/frappe/frappe/model/document.py", line 334, in save
    return self._save(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/model/document.py", line 369, in _save
    self.run_before_save_methods()
  File "apps/frappe/frappe/model/document.py", line 1081, in run_before_save_methods
    self.run_method("validate")
  File "apps/frap

GitHub Labels

bug