时间戳

首页 > 解决方案 > 如何在 Flaks wtform DecimalField 上设置 use_locale？

python - 如何在 Flaks wtform DecimalField 上设置 use_locale？

问题描述

我一直在尝试为 wtform DecimalField 设置“use_locale”参数，但似乎没有任何效果，而且几乎没有任何关于如何设置“use_locale”的示例。我已经阅读了 Babel 和 WTForm DecimalField 的文档，但到目前为止我一无所获。

这是相关的代码片段：

初始化.py：

from flask import Flask, request
from config import Config
from flask_babel import Babel, Locale

app = Flask(__name__)
app.config.from_object(Config)

babel = Babel(app)
locale = Locale('pt', 'BR')

表格.py：

from flask_wtf import FlaskForm
from app import app, db, locale
from wtforms import StringField, BooleanField, SubmitField, TextAreaField, IntegerField, SelectField, DecimalField
from wtforms.validators import ValidationError, DataRequired, EqualTo, Length

class Alterar(FlaskForm):
     valor = DecimalField('ValorTotal', validators=[DataRequired(),Length(min = 1)], use_locale = True)

路线.py

from flask import render_template, flash, redirect, url_for, request
from app import app, db
from app.forms import Alterar
from app.models import Orders
@app.route('/v_info/<id_order>', methods=['GET, POST'])
    def v_info(id_order):
    table = db.session.query(Orders).filter(Orders.id_ord == id_order).first()
    form = Alterar(request.form, obj=table)
    return render_template('v_info.html', data = table, form = form)

最后，我得到的错误是：

Traceback (most recent call last):
  File "c:\anaconda3\lib\site-packages\flask\app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "c:\anaconda3\lib\site-packages\flask\app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "c:\anaconda3\lib\site-packages\flask\app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "c:\anaconda3\lib\site-packages\flask\_compat.py", line 39, in reraise
    raise value
  File "c:\anaconda3\lib\site-packages\flask\app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "c:\anaconda3\lib\site-packages\flask\app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "C:\Users\MS\websiteProject\app\routes.py", line 78, in v_info
    form = Alterar(request.form, obj=table)
  File "c:\anaconda3\lib\site-packages\wtforms\form.py", line 208, in __call__
    return type.__call__(cls, *args, **kwargs)
  File "c:\anaconda3\lib\site-packages\flask_wtf\form.py", line 87, in __init__
    super(FlaskForm, self).__init__(formdata=formdata, **kwargs)
  File "c:\anaconda3\lib\site-packages\wtforms\form.py", line 268, in __init__
    super(Form, self).__init__(self._unbound_fields, meta=meta_obj, prefix=prefix)
  File "c:\anaconda3\lib\site-packages\wtforms\form.py", line 51, in __init__
    field = meta.bind_field(self, unbound_field, options)
  File "c:\anaconda3\lib\site-packages\wtforms\meta.py", line 27, in bind_field
    return unbound_field.bind(form=form, **options)
  File "c:\anaconda3\lib\site-packages\wtforms\fields\core.py", line 376, in bind
    return self.field_class(*self.args, **kw)
  File "c:\anaconda3\lib\site-packages\wtforms\fields\core.py", line 663, in __init__
    super(DecimalField, self).__init__(label, validators, **kwargs)
  File "c:\anaconda3\lib\site-packages\wtforms\fields\core.py", line 588, in __init__
    self.locale = kwargs['_form'].meta.locales[0]
TypeError: 'bool' object is not subscriptable
127.0.0.1 - - [26/Sep/2020 07:42:48] "[35m[1mGET /v_info/1234 HTTP/1.1[0m" 500 -

我知道 bool 对象不可下标，但是，我应该在“use_locale”参数中传递什么？文档中有关课程的详细信息：

class wtforms.fields.DecimalField(default field arguments, places=2, rounding=None, use_locale=False, number_format=None)[source]¶

    A text field which displays and coerces data of the decimal.Decimal type.

    Parameters

            places – How many decimal places to quantize the value to for display on form. If None, does not quantize value.

            rounding – How to round the value during quantize, for example decimal.ROUND_UP. If unset, uses the rounding value from the current thread’s context.

            use_locale – If True, use locale-based number formatting. Locale-based number formatting requires the ‘babel’ package.

            number_format – Optional number format for locale. If omitted, use the default decimal format for the locale.

标签： pythonflaskflask-wtformspython-babel

解决方案

如果您只想查看格式化的值，您可以定义一个过滤器并将其应用于模板：

from babel.numbers import format_decimal

def FormatDecimal(value):
    return format_decimal(value, locale='de_DE')

jinja2.filters.FILTERS['FormatDecimal'] = FormatDecimal

{{ decimal_value | FormatDecimal }}

如果您想将其添加到输入字段，也许您可​​以尝试使用过滤器（不确定是否有效）：

DecimalField('ValorTotal', validators=[DataRequired(),Length(min = 1)], filters=[lambda x: format_decimal(x, locale='de_DE')])

推荐阅读