MangoDB using JavaScript Pattern with $in operator

Question

Trying to create a MongoDB query with the Pymongo driver that search a database for some dog breeds, but I need to do pattern matching due to data being of differing quality. I know I cannot use Regex in a $in style query so I am using JS patterns.

I have this so far:

df = shelter.getRecords({
    "breed": {"$in": [/labrador/i, /chesa/i, /newfound/i]}
    })

But I get syntax errors. Command seems to work in Mongo shell….is this a limitation of Pymongo?

Asked By: Brandon Hobbs

||

Source

Answer 1

You could use "$regex" like this.

N.B.: Your pymongo query filter could be a python dictionary like {'breed': {'$regex': '(labrador)|(chesa)|(newfound)', '$options': 'i'}}.

db.shelter.find({
  "breed": {
    "$regex": "(labrador)|(chesa)|(newfound)",
    "$options": "i"
  }
})

Example output:

[
  {
    "_id": 21,
    "breed": "Chesapeake Retriever"
  },
  {
    "_id": 80,
    "breed": "Newfoundland"
  }
]

Try it on mongoplayground.net.

Answered By: rickhg12hs

Answer 2

In the end this was my hybrid approach…

           labRegex = re.compile(".*lab.*", re.IGNORECASE)
           chesaRegex = re.compile(".*chesa.*", re.IGNORECASE)
           newRegex = re.compile(".*newf.*", re.IGNORECASE)
           
           df = pd.DataFrame.from_records(shelter.getRecordCriteria({
               '$or':[ #Regex isn't allowed in an $in helper so use $or
                   {"breed": {'$regex': newRegex}}, #pass the regex to the filter
                   {"breed": {'$regex': chesaRegex}},
                   {"breed": {'$regex': labRegex}},
               ],
               "sex_upon_outcome": "Intact Female",
               "age_upon_outcome_in_weeks": {"$gte":26.0, "$lte":156.0}
           }))

Answered By: Brandon Hobbs

MangoDB using JavaScript Pattern with $in operator

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