Flask 烧瓶形式-'；未绑定字段'；对象不可调用，动态字段赢了'；正确初始化

app.py

books.html

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

app = Flask(__name__)
app.config['SECRET_KEY'] = 'apple pie'


class BookForm(FlaskForm):
    book = StringField('book title')


class LibraryForm(FlaskForm):
    def __init__(self, min_entries=0, *args, **kwargs):
        super(LibraryForm, self).__init__(*args, **kwargs)
        self.books = FieldList(FormField(BookForm), min_entries=min_entries)

    library = StringField('Library name')
    books = FieldList(FormField(BookForm), min_entries=3)
    submit = SubmitField('Submit')


@app.route('/book', methods=['GET', 'POST'])
def book():
    form = LibraryForm(min_entries=5)
    if form.validate_on_submit():
        return 'aww yeah'
    return render_template('books.html', form=form)

当我注释掉init函数时，表单按照预期工作，除了不灵活的图书字段数量。我花了相当长的时间寻找答案，但找不到任何解决问题的方法

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任何帮助都是徒劳的

这不是一个理想的解决方案，但这是可行的

TypeError: 'UnboundField' object is not callable

TypeError: 'UnboundField' object is not callable

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

app = Flask(__name__)
app.config['SECRET_KEY'] = 'apple pie'


class BookForm(FlaskForm):
    book = StringField('book title')


class LibraryForm(FlaskForm):
    library = StringField('Library name')
    books = FieldList(FormField(BookForm))
    submit = SubmitField('Submit')


@app.route('/book', methods=['GET', 'POST'])
def book():
    form = LibraryForm()
    if form.validate_on_submit():
        return 'aww yeah'
    for i in range(6):
        form.books.append_entry()

    return render_template('books.html', form = form)