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  • Additional form validation

    Hi,

    Forgive me if this seems like a silly question. However, I have been googling for some time on this subject.

    I was wondering about the best way to add additional form validation and error message handling. For example, if I have a column that is a number, what is the best way to present a pretty error message if the user enters characters?

    I looked into custom validation through the ConstraintValidator interface. For this kind of validation, this does not appear to be the correct methodology.

    I am looking to do add pretty user error messages if:
    • Entry in form should be a number and user enters characters
    • Unique constraint violations
    • Database issues such as connection errors
    • User tries to delete a child that has a parent assigned

    What is the best methology for adding these kinds of validations?
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