forms.py

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"""Contains the logic to create cohesive forms on the explore view"""
from typing import List  # pylint: disable=unused-import

from flask_appbuilder.fieldwidgets import BS3TextFieldWidget
from wtforms import Field


class CommaSeparatedListField(Field):
    widget = BS3TextFieldWidget()
    data = []  # type: List[str]

    def _value(self):
        if self.data:
            return u", ".join(self.data)

        return u""

    def process_formdata(self, valuelist):
        if valuelist:
            self.data = [x.strip() for x in valuelist[0].split(",")]
        else:
            self.data = []


def filter_not_empty_values(value):
    """Returns a list of non empty values or None"""
    if not value:
        return None
    data = [x for x in value if x]
    if not data:
        return None
    return data