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from wtforms.validators import ValidationError
from ..widgets import SelectWidget
from .select import SelectField
class SelectMultipleField(SelectField):
"""
No different from a normal select field, except this one can take (and
validate) multiple choices. You'll need to specify the HTML `rows`
attribute to the select field when rendering.
"""
widget = SelectWidget(multiple=True)
def process_data(self, value):
try:
self.data = list(self.coerce(v) for v in value)
except (ValueError, TypeError):
self.data = None
def process_formdata(self, valuelist):
try:
self.data = list(self.coerce(x) for x in valuelist)
except ValueError:
raise ValueError(
self.gettext(
"Invalid choice(s): one or more data inputs " "could not be coerced"
)
)
def pre_validate(self, form):
if self.data:
values = self.choice_values
for value in self.data:
if value not in values:
raise ValidationError(
self.gettext(
"'%(value)s' is not a valid" " choice for this field"
)
% dict(value=value)
)
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