Allow add previous exception in ConversionException

[peter-gribanov]

Q	A
Type	feature
BC Break	no
Fixed issues	-

Summary

I often use Value Object, and the code of DBAL type looks something like this:

final class MoneyType extends Type
{
    public function convertToPHPValue($value, AbstractPlatform $platform)
    {
        if ($value === null || $value instanceof Money) {
            return $value;
        }

        try {
            return new Money($value, new Currency('EUR'));
        } catch (\Exception $e) {
            throw ConversionException::conversionFailed($value, $this->getName());
        }
    }

    // ...

}

In this case, it would be convenient to add the previous exception to ConversionException.

[greg0ire]

Please update tests/Doctrine/Tests/DBAL/Types/ConversionExceptionTest.php

[peter-gribanov]

@greg0ire sorry, but why did you close this PR?

[greg0ire]

I deleted branch 2.10, and it closed the PR, and I missed the notification, sorry, I'm going to try to fix this.

The base branch was changed.

[peter-gribanov]

Travis CI no see files in ./tests/travis/ folder.
https://travis-ci.org/doctrine/dbal/builds/657018720

$ bash ./tests/travis/install-mysql-8.0.sh
bash: ./tests/travis/install-mysql-8.0.sh: No such file or directory

$ if [[ "$DB" == "mysql" || "$DB" == "mysqli" || "$DB" == *"mariadb"* ]]; then mysql < tests/travis/create-mysql-schema.sql; fi;
/home/travis/.travis/functions: line 109: tests/travis/create-mysql-schema.sql: No such file or directory

try rebuild

[greg0ire]

Thanks @peter-gribanov