forms.py

from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField, SelectField, DateField
from wtforms.validators import DataRequired, Length
from datetime import datetime, timedelta

today = datetime.today().date()
default_depart = today + timedelta(days=1)
default_return = today + timedelta(days=3)

class FlightSearchForm(FlaskForm):
    departure_city = StringField("Departure City", render_kw={"placeholder": "From where?"},
                                      validators=[DataRequired(), Length(min=3, max=30)])
    destination_city = StringField("Destination City", render_kw={"placeholder": "To where?"},
                                      validators=[DataRequired(), Length(min=3, max=30)])
    adults = SelectField("Adults", choices=[(1, 1), (2, 2), (3, 3), (4, 4), (5, 5), (6, 6), (7, 7), (8, 8), (9, 9)],
                           validators=[DataRequired()])
    children = SelectField("Children", choices=[(0, 0), (1, 1), (2, 2), (3, 3), (4, 4), (5, 5), (6, 6), (7, 7), (8, 8), (9, 9)],
                           validators=[DataRequired()])
    infants = SelectField("Infants", choices=[(0, 0), (1, 1), (2, 2), (3, 3), (4, 4), (5, 5), (6, 6), (7, 7), (8, 8), (9, 9)],
                           validators=[DataRequired()])
    date_from = DateField("Depart", validators=[DataRequired()], default=default_depart)
    date_to = DateField("Return", validators=[DataRequired()], default=default_return)
    currency = SelectField("Currency", choices=[("CAD", "CAD"), ("USD", "USD"), ("EUR", "EUR")],
                           validators=[DataRequired()])
    submit = SubmitField("Search Flights")