Check Guide

The Check concept is a part of the Validation API. You can create a custom Check to be used as part of resource or package validation.

Check Example

Python

from frictionless import Check, errors

class duplicate_row(Check):

code = "duplicate-row"

Errors = [errors.DuplicateRowError]

def __init__(self, descriptor=None):

super().__init__(descriptor)

self.__memory = {}

def validate_row(self, row):

text = ",".join(map(str, row.values()))

hash = hashlib.sha256(text.encode("utf-8")).hexdigest()

match = self.__memory.get(hash)

if match:

note = 'the same as row at position "%s"' % match

yield errors.DuplicateRowError.from_row(row, note=note)

self.__memory[hash] = row.row_position

# Metadata

metadata_profile = { # type: ignore

"type": "object",

"properties": {},

}

It's usuall to create a custom Error along side with a Custom Check.