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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def run_query(self, query):
 """ method runs query on a specified collection and return a list of filtered Model records """

        collection = self.ds.connection(self.collection_name)

        cursor = collection.find(query)
        if cursor.count() == 0:
            raise LookupError('Collection {0} has no {1} records'
                              .format(self.collection_name, self.model_klass.__name__))
        return [self.model_klass.from_json(entry) for entry in cursor]