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django-mongodb / django_mongodb / djangopatch.py

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#-*- coding:utf-8 -*-

# Copyright (c) 2009, Kirill Mavreshko (kimavr@gmail.com)
# All rights reserved.

# Redistribution and use in source and binary forms, with or without 
# modification, are permitted provided that the following conditions are met:

#    * Redistributions of source code must retain the above copyright notice, 
#      this list of conditions and the following disclaimer.
#    * Redistributions in binary form must reproduce the above copyright notice,
#      this list of conditions and the following disclaimer in the documentation
#      and/or other materials provided with the distribution.
#    * The name of the author may not be used to endorse or promote products
#      derived from this software without specific prior written permission.

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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"""
django_mongodb.djangopatch -- Collection of MongoDB-related monkey patches for Django ORM.
"""

from pymongo.objectid import ObjectId

_django_is_patched = False

INVALID_DJANGO_COMMANDS = ("sqlclear","sqlall",)


def AutoField_to_python(self, value):
    return value

def AutoField_get_db_prep_value(self, value):
    return value

def apply_mongo_patch():
    global _django_is_patched
    if not _django_is_patched:
        from django.db.models import fields
        from django.db.models.sql import subqueries
        from django_mongodb import query
        from django.core import management
        fields.AutoField.to_python = AutoField_to_python
        fields.AutoField.get_db_prep_value = AutoField_get_db_prep_value
        
        subqueries.UpdateQuery.execute_sql = query.UpdateQuery_execute_sql
        subqueries.DeleteQuery.execute_sql = query.DeleteQuery_execute_sql
        subqueries.InsertQuery.execute_sql = query.InsertQuery_execute_sql

        django_commands = management.get_commands()
        for cmd in INVALID_DJANGO_COMMANDS:
            del django_commands[cmd]

        _django_is_patched = True