我使用 Flask 制作了一个学费支付应用程序,并使用 Flask-admin 来管理付款。
Flask-Admin 通过我在 models.py 上声明的 SQLAlchemy 自动生成表行
这是我的桌子的图片: 现在我想在每个总帐单号码旁边提供一个按钮,以便结帐帐单。
我知道如何使用 ModelView 提供的 column_list 方法添加列,正如我尝试使用下面的代码:
column_list = ('student_id', 'total_bill', 'Pay Now')
它会给出这样的视图显示: 现在我希望“立即付款”列为每一行都有一个按钮,就像我使用 HTML 手动编码一样,如下所示: 每行都有结帐按钮,正如我上面提到的,这个目的是为了结帐按钮。 那么,该怎么做..?,任何帮助将不胜感激
。 例如,每行“结帐”按钮可以呈现为带有提交按钮的 HTML 表单,并且学生 ID 呈现为表单内的隐藏字段。
下面的简单示例(Python 2.7),文件全部驻留在根目录中。
views.py
包含重要的代码,其余的都是简单的 Flask 内容。
StudentView
定义了一个方法
_format_pay_now
,如果模型的 is_paid
值为 True
,则呈现字符串“Paid”,否则呈现 HTML 表单。类
StudentView
还通过方法
'/admin/student/checkout'
公开了路线checkout_view
来处理提交的表单。在此特定实例中,is_paid
列设置为 True,并且列表视图重新呈现。views.py
from flask import redirect, flash, url_for
from flask_admin import expose
from flask_admin.contrib import sqla
from flask_admin.helpers import get_form_data
from flask_admin.babel import gettext
from markupsafe import Markup
class StudentView(sqla.ModelView):
page_size = 5
column_list = ('id', 'cost', 'Pay Now')
column_editable_list = ['cost']
# override the column labels
column_labels = {
'id': 'Student ID',
'cost': 'Total Bill',
}
def _format_pay_now(view, context, model, name):
if model.is_paid:
return 'Paid'
# render a form with a submit button for student, include a hidden field for the student id
# note how checkout_view method is exposed as a route below
checkout_url = url_for('.checkout_view')
_html = '''
<form action="{checkout_url}" method="POST">
<input id="student_id" name="student_id" type="hidden" value="{student_id}">
<button type='submit'>Checkout</button>
</form
'''.format(checkout_url=checkout_url, student_id=model.id)
return Markup(_html)
column_formatters = {
'Pay Now': _format_pay_now
}
@expose('checkout', methods=['POST'])
def checkout_view(self):
return_url = self.get_url('.index_view')
form = get_form_data()
if not form:
flash(gettext('Could not get form from request.'), 'error')
return redirect(return_url)
# Form is an ImmutableMultiDict
student_id = form['student_id']
# Get the model from the database
model = self.get_one(student_id)
if model is None:
flash(gettext('Student not not found.'), 'error')
return redirect(return_url)
# process the model
model.is_paid = True
try:
self.session.commit()
flash(gettext('Student, ID: {student_id}, set as paid'.format(student_id=student_id)))
except Exception as ex:
if not self.handle_view_exception(ex):
raise
flash(gettext('Failed to set student, ID: {student_id}, as paid'.format(student_id=student_id), error=str(ex)), 'error')
return redirect(return_url)
from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()
class Student(db.Model):
id = db.Column(db.Integer, primary_key=True)
cost = db.Column(db.Integer(), nullable=False)
is_paid = db.Column(db.Boolean(), nullable=False)
def __str__(self):
return unicode(self).encode('utf-8')
def __unicode__(self):
return "ID: {id}; Cost : {cost}".format(id=self.id, cost=self.cost)
使用
flask create-database
生成 SQLite 数据库。
import random
from flask.cli import click, with_appcontext
from models import db, Student
@click.command('create-database')
@with_appcontext
def create_database():
# Create 100 students
db.drop_all()
db.create_all()
for _ in range(0, 100):
_project = Student(
cost=random.randrange(10, 200),
is_paid=False
)
db.session.add(_project)
db.session.commit()
app.py
from flask import Flask
from flask_admin import Admin
from models import db, Student
from commands import create_database
app = Flask(__name__)
# Create dummy secrey key so we can use sessions
app.config['SECRET_KEY'] = '123456790'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
# Create in-memory database
app.config['DATABASE_FILE'] = 'sample_db.sqlite'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + app.config['DATABASE_FILE']
db.init_app(app)
app.cli.add_command(create_database)
# Flask views
@app.route('/')
def index():
return '<a href="/admin/">Click me to get to Admin!</a>'
from views import StudentView
admin = Admin(app, template_mode="bootstrap3")
admin.add_view(StudentView(Student, db.session))
if __name__ == '__main__':
app.run()
Click==7.0
enum34==1.1.6
Flask==1.0.2
Flask-Admin==1.5.3
Flask-SQLAlchemy==2.3.2
itsdangerous==1.1.0
Jinja2==2.10
MarkupSafe==1.1.0
SQLAlchemy==1.2.17
Werkzeug==0.14.1
WTForms==2.2.1
class BaseProductsView(AuthMixin, ModelView):
edit_modal = True
column_extra_row_actions = [
LinkRowAction(
'glyphicon glyphicon-search',
'/similar-products/?product_id={row_id}',
title='Show similar list'
)
]