Customize

Custom Error Message

We can custom error messages for all validators. Here is an example of how to customize error messages for the Password validator.

# common ways custom error messages
Numeric(message="Value should be a number").validate(5.2,'data')
# example Password
Password(messages={"numbers": "one number"})

Note

Only the password rule has different ways to customize error messages.

Custom Rule

• We can create custom rules by create a class that has a validate method.
• in the validate method must has two parameters value and field_name.
• The value is the data that we want to validate and the field_name is the name of the field that we want to validate.
• The validate method must return None if the data is valid, otherwise return the error message (string).

# create a custom rules
class UniqueRule:
    def __init__(self, table, field):
        self.table = table
        self.field = field

    def validate(self, value, field_name):
        # validate data is unique or not
        if not unique:
            return f"{field_name} is not unique"
        return None

see at example how to use the custom rule.