传递并使用 FlaskForm (WTForms) 中的变量

Question

代码非常不言自明 - 我想将变量传递给 FlaskForm 子类以供进一步使用。

from flask import Flask, render_template_string
from flask_wtf import FlaskForm
from wtforms import StringField
from flask_wtf.csrf import CSRFProtect


app = Flask(__name__)
spam = 'bar'
app.secret_key = 'secret'
csrf = CSRFProtect(app)

@app.route('/')
def index():
    eggs = spam
    form = FooForm(eggs)
    return render_template_string(
    '''
    {{ form.bar_field.label }} {{ form.bar_field }}
    ''',form = form)

class FooForm(FlaskForm):
    def __init__(self, bar):
        super(FooForm, self).__init__()
        self.bar = bar
    bar_field = StringField("Label's last word is 'bar': {0}".format(self.bar))

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

我得到的是

line 22, in FooForm
    bar_field = StringField("Label's last word is 'bar': {0}".format(self.bar))
NameError: name 'self' is not defined

我如何达到期望？

Answer 1

我遇到了与此非常相似的问题，我花了一段时间才弄清楚。你想做的事情可以这样完成：

from wtforms.fields.core import Label

class FooForm(FlaskForm):
    bar_field = StringField("Label does not matter")


@app.route('/')
def index():
    eggs = 'bar'
    form = FooForm()
    form.bar_field.label = Label("bar_field", "Label's last word is 'bar': {0}".format(eggs))

    return render_template_string(
    '''
    {{ form.bar_field.label }} {{ form.bar_field }}
    ''',form = form)

在此处查看我提出的问题和我的回答：flaskform pass a variable (WTForms)

Answer 2

将您的 bar_field = StringField("Label's last word is 'bar': {0}".format(self.bar)) 放入 init() 方法中。 使用这个：

class FooForm(FlaskForm):
def __init__(self, bar):
    super(FooForm, self).__init__()
    self.bar = bar
    self.bar_field = StringField("Label's last word is 'bar': {0}".format(self.bar))