added notBlank validator

[masseelch]

I myself needed it and i think many other will do too.

Tests are added.

[themisir]

I have changed .required logic yesterday which now checks if length > 0. It's now available as prerelease that you can get v0.1.6-next version here.

[masseelch]

Ha. How unfortunate 😄

I still think, you should split required into notNull and notBlank.

[themisir]

I still think, you should split required into notNull and notBlank.

I think value of TextFormField never equals to null.

[masseelch]

I think value of TextFormField never equals to null.

If one would create a custom form field (like i did with a signature-field), it can return null as value. In that case the required validator would not work. It now checks for length, my custom type in a custom form field might not have a length property.

[themisir]

I think value of TextFormField never equals to null.

If one would create a custom form field (like i did with a signature-field), it can return null as value. In that case the required validator would not work. It now checks for length, my custom type in a custom form field might not have a length property.

😅 may you reopen the PR? I'll merge it after changing a bit.

[masseelch]

I somehow managed to delete my fork from my account 😅.

I will fork again and create a new one. Still have a local copy.

[themisir]

Ok, don't worry I'll write myself. Btw thanks for PR. I will use ValidationBuilder(optional: true | false) parameter to validate not null and use required to validate value.length > 0.

[iksent]

Hello, @themisir!

When are you planning to release the new version?

"required"-validator does not work for TextEditingController, because it has an empty string as initial value, but "required"-validator checks for null.

UPD: But for now I use the extension and everything works. Thanks for the cool library!

extension CustomValidationBuilder on ValidationBuilder {
  ValidationBuilder notBlank() => add((value) {
    if (value == null || value.isEmpty) {
      return requiredMessage;
    }
    return null;
  });
}