old_contents: # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
  # MIT License. See license.txt
  
  from __future__ import unicode_literals
  
  from frappe.model.document import Document
  
  class DocField(Document):
  	pass
  
new_contents: # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
  # MIT License. See license.txt
  
  from __future__ import unicode_literals
  
  import frappe
  from frappe.model.document import Document
  
  class DocField(Document):
  	def get_link_doctype(self):
  		'''Returns the Link doctype for the docfield (if applicable)
  		if fieldtype is Link: Returns "options"
  		if fieldtype is Table MultiSelect: Returns "options" of the Link field in the Child Table
  		'''
  		if self.fieldtype == 'Link':
  			return self.options
  
  		if self.fieldtype == 'Table MultiSelect':
  			table_doctype = self.options
  
  			link_doctype = frappe.db.get_value('DocField', {
  				'fieldtype': 'Link',
  				'parenttype': 'DocType',
  				'parent': table_doctype,
  				'in_list_view': 1
  			}, 'options')
  
  			return link_doctype
  
subject: Add get_link_doctype method in DocField