old_contents: # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
  # MIT License. See license.txt
  
  from __future__ import unicode_literals
  
  import frappe
  from frappe import _
  import json
  
  @frappe.whitelist()
  def update_event(args, field_map):
  	"""Updates Event (called via calendar) based on passed `field_map`"""
  	args = frappe._dict(json.loads(args))
  	field_map = frappe._dict(json.loads(field_map))
  	w = frappe.get_doc(args.doctype, args.name)
  	w.set(field_map.start, args[field_map.start])
  	w.set(field_map.end, args.get(field_map.end))
  	w.save()
  
  def get_event_conditions(doctype, filters=None):
  	"""Returns SQL conditions with user permissions and filters for event queries"""
  	from frappe.desk.reportview import build_match_conditions
  	if not frappe.has_permission(doctype):
  		frappe.throw(_("Not Permitted"), frappe.PermissionError)
  
  	conditions = build_match_conditions(doctype)
  	conditions = conditions and (" and " + conditions) or ""
  	if filters:
  		filters = json.loads(filters)
  		for key in filters:
  			if filters[key]:
  				conditions += " and " + key + ' = "' + filters[key].replace('"', '\"') + '"'
  
  	return conditions
  
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 import _
  import json
  
  @frappe.whitelist()
  def update_event(args, field_map):
  	"""Updates Event (called via calendar) based on passed `field_map`"""
  	args = frappe._dict(json.loads(args))
  	field_map = frappe._dict(json.loads(field_map))
  	w = frappe.get_doc(args.doctype, args.name)
  	w.set(field_map.start, args[field_map.start])
  	w.set(field_map.end, args.get(field_map.end))
  	w.save()
  
  def get_event_conditions(doctype, filters=None):
  	"""Returns SQL conditions with user permissions and filters for event queries"""
  	from frappe.desk.reportview import build_match_conditions
  	if not frappe.has_permission(doctype):
  		frappe.throw(_("Not Permitted"), frappe.PermissionError)
  
  	conditions = build_match_conditions(doctype)
  	conditions = conditions and (" and " + conditions) or ""
  	if filters:
  		filters = json.loads(filters)
  		for key in filters:
  			if filters[key]:
  				conditions += 'and `{0}` = "{1}"'.format(frappe.db.escape(key), frappe.db.escape(filters[key]))
  
  	return conditions
  
subject: exclude double quotes while creating event conditions