我创建了一个带有SQLAlchemy后端的Flask应用程序,该应用程序非常简单。但是,在使用Flask Admin扩展程序时遇到了一个问题。尽管它对于大多数模型都适用,但其中一些给了我以下错误:
TypeError: 'unicode' object is not callable
这是问题模型之一的示例:
class Trade(db.Model):
__tablename__ = 'trade'
id = db.Column(db.Integer, primary_key=True)
issuer_id = db.Column(db.Integer,
db.ForeignKey('issuer.id'), primary_key=True)
obligation_id = db.Column(db.Integer,
db.ForeignKey('obligation.id'))
obligation = db.relationship('Obligation', backref='trades')
type = db.Column(db.String(50))
purpose = db.Column(db.String(50))
date = db.Column(db.Date)
currency = db.Column(db.Text)
amount = db.Column(db.Float)
__mapper_args__ = {
'polymorphic_on': purpose,
'polymorphic_identity': 'trade',
'with_polymorphic': '*'
}
def __str__(self):
return self.obligation + ' ' + self.date.strftime('%y-%m-%d')
为了提供有关扩展如何调用它的上下文,我有一些代码为所有sqlalchemy模型创建管理页面。
from test_app import app
from flask.ext.admin import Admin
from test_app.db import db, get_model, models_list
from flask.ext.admin.contrib import sqla
admin = Admin(app, name='Test App')
for model in sorted(models_list()):
admin_cls = type(model, (sqla.ModelView,), {'column_display_pk': False})
admin_view = admin_cls(get_model(model), db.session)
admin.add_view(admin_view)
最终结果是,当我导航到该模型的管理页面时,出现以下错误,该错误并没有为导致该问题的代码行提供太多上下文。
File "/home/user/app/venv/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
return self.wsgi_app(environ, start_response)
File "/home/user/app/venv/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/home/user/app/venv/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
reraise(exc_type, exc_value, tb)
File "/home/user/app/venv/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
response = self.full_dispatch_request()
File "/home/user/app/venv/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/user/app/venv/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/home/user/app/venv/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
rv = self.dispatch_request()
File "/home/user/app/venv/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/base.py", line 60, in inner
return f(self, *args, **kwargs)
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/base.py", line 60, in inner
return f(self, *args, **kwargs)
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/base.py", line 60, in inner
return f(self, *args, **kwargs)
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/model/base.py", line 1182, in index_view
actions_confirmation=actions_confirmation)
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/base.py", line 254, in render
return render_template(template, **kwargs)
File "/home/user/app/venv/lib/python2.7/site-packages/flask/templating.py", line 128, in render_template
context, ctx.app)
File "/home/user/app/venv/lib/python2.7/site-packages/flask/templating.py", line 110, in _render
rv = template.render(context)
File "/home/user/app/venv/lib/python2.7/site-packages/jinja2/environment.py", line 969, in render
return self.environment.handle_exception(exc_info, True)
File "/home/user/app/venv/lib/python2.7/site-packages/jinja2/environment.py", line 742, in handle_exception
reraise(exc_type, exc_value, tb)
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/templates/admin/model/list.html", line 4, in top-level template code
{% import 'admin/actions.html' as actionlib with context %}
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/templates/admin/master.html", line 1, in top-level template code
{% extends admin_base_template %}
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/templates/admin/base.html", line 22, in top-level template code
{% block page_body %}
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/templates/admin/base.html", line 50, in block "page_body"
{% block body %}{% endblock %}
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/templates/admin/model/list.html", line 49, in block "body"
{% block model_list_table %}
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/templates/admin/model/list.html", line 95, in block "model_list_table"
{% block list_row scoped %}
File "/home/user/app/venv/lib/python2.7/site-packages/flask_admin/templates/admin/model/list.html", line 118, in block "list_row"
<td>{{ get_value(row, c) }}</td>
TypeError: 'unicode' object is not callable
任何有关如何调试此建议将不胜感激。
非常感谢。
更新:
我发现了错误。它与@property装饰器有关。在模型定义中,我有两个属性。
@property
def issue(self):
return str(self.description)
@property
def __str__(self):
return self.issue
如果删除str上方的@property,则该错误消失。
之所以发生这种情况,是因为Flask-Admin需要__unicode__
Python 2上的模型中的字符串。
尝试将您的模型更改__str__
为__unicode__
,应用程序将起作用。同时,我将更新示例以使其与Python 2更兼容。
在python 3上,__str__
不应具有@property
装饰器。
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