nested form object population

home.html

<form method="post" action="">
    {{ form.hidden_tag() }}
    {{ form.id }}
    {{ form.name }}
    {% for entry in form.players %}
        {{ entry() }}
    {% endfor %}
    <input type="submit"/>
</form>

quick_mk2.py

from flask import Flask, render_template
from flask_wtf import FlaskForm
from wtforms import StringField, FormField, FieldList, IntegerField


app = Flask(__name__)
app.secret_key = "SCRATCH"


# Our pretend object data (I'd use SQLAlchemy to do this in reality).


class TeamObj(object):
    id = 0
    name = ""


class PlayerObj(object):
    id = 0
    name = ""


pa = PlayerObj()
pa.name = "Carol"
pa.id = 1

pb = PlayerObj()
pb.name = "Jane"
pb.id = 2

# SQLAlchemy might be: team = Team.query.get(2)

team = TeamObj()
team.name = "Bombers"
team.id = 2
team.players = [pa, pb]


class PlayerForm(FlaskForm):
    name = StringField("Player Name")
    id = IntegerField("id")


class TeamForm(FlaskForm):
    id = IntegerField("Team ID")
    name = StringField("Team Name")
    players = FieldList(
        FormField(PlayerForm, default=PlayerObj), min_entries=7, max_entries=7
    )


@app.route("/", methods=["post", "get"])
def home():
    results = []
    form = TeamForm(obj=team)
    if form.validate_on_submit():
        results = []
        for idx, data in enumerate(form.players.data):
            results.append(data)
        results.append(form.name.data)
        return render_template("results.html", results=results)
    print(form.errors)
    return render_template("home.html", form=form)


if __name__ == "__main__":
    app.run(debug=True)

results.html

<ul>
{% for line in results %}
    <li>{{ line }}</li>
{% endfor %}
</ul>

Yeah, I think I end up in the same place pretty much-- feels like there's improvements to be had though, will be pondering it for a while 😄 🤔

if form.validate_on_submit():
    team = Team(name=form.name.data)
    for player_data in form.players.data:
        # maybe some validation here to trim any 'default' entries.
        if len(player_data["name"]):
            p = Player(
                name=player_data["name"],
                age=player_data["age"],
                team=team
            )
    db.session.add(team)
    db.session.commit()