When both $options and $regex are BSON strings the order they appear in the query does not seem to matter. However $options appears to be ignored when it appears first and $regex is a BSON regular expression.
import pymongo import re from bson import SON client = pymongo.MongoClient() coll = client.test.test coll.drop() coll.insert_one({'array': [re.compile(b'62', 0), 'no options']}) coll.insert_one({'array': [re.compile(b'62', re.IGNORECASE), 'IGNORECASE']}) for q in [ {'array': SON([('$options', 'i'), ('$regex', '62')])}, {'array': SON([('$regex', '62'), ('$options', 'i')])}, {'array': SON([('$regex', re.compile(b'62', re.IGNORECASE))])}, {'array': SON([('$regex', re.compile(b'62')), ('$options', 'i')])}, {'array': SON([('$options', 'i'), ('$regex', re.compile(b'62'))])}]: res = list(coll.find(q, projection={'_id': False})) print('>>> list(coll.find(%r)):\n%r' % (q, res))
Expected output:
>>> list(coll.find({'array': SON([('$options', 'i'), ('$regex', '62')])})): [{'array': [Regex('62', 2), 'IGNORECASE']}] >>> list(coll.find({'array': SON([('$regex', '62'), ('$options', 'i')])})): [{'array': [Regex('62', 2), 'IGNORECASE']}] >>> list(coll.find({'array': SON([('$regex', re.compile(b'62', re.IGNORECASE))])})): [{'array': [Regex('62', 2), 'IGNORECASE']}] >>> list(coll.find({'array': SON([('$regex', re.compile(b'62')), ('$options', 'i')])})): [{'array': [Regex('62', 2), 'IGNORECASE']}] >>> list(coll.find({'array': SON([('$options', 'i'), ('$regex', re.compile(b'62'))])})): [{'array': [Regex('62', 0), 'IGNORECASE']}]
Actual output (notice the difference in the final query):
>>> list(coll.find({'array': SON([('$options', 'i'), ('$regex', '62')])})): [{'array': [Regex('62', 2), 'IGNORECASE']}] >>> list(coll.find({'array': SON([('$regex', '62'), ('$options', 'i')])})): [{'array': [Regex('62', 2), 'IGNORECASE']}] >>> list(coll.find({'array': SON([('$regex', re.compile(b'62', re.IGNORECASE))])})): [{'array': [Regex('62', 2), 'IGNORECASE']}] >>> list(coll.find({'array': SON([('$regex', re.compile(b'62')), ('$options', 'i')])})): [{'array': [Regex('62', 2), 'IGNORECASE']}] >>> list(coll.find({'array': SON([('$options', 'i'), ('$regex', re.compile(b'62'))])})): [{'array': [Regex('62', 0), 'no options']}]
- causes
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PYTHON-1681 Query returns different results depending on order of items in query dictionary
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- Closed
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