Find documents in mongoengine with dict object

query.py

from mongoengine.queryset.visitor import Q


class Query():
    
    def _parse(queries):
        this = Query()
        this._or = queries.get('or', [])
        this._and = queries.get('and', [])

        attr = next(iter(queries))
        this.q = Q()
        this.q.query = {attr: queries[attr]}

        return this

    def execute(query):
        query = Query._parse(query)
        if (not query._or and not query._and):
            return query.q
        result = query.q
        if (query._and):
            for q in query._and:
                result = result & Query.execute(q)
        if (query._or):
            for q in query._or:
                result = result | Query.execute(q)
        return result