Question

我尝试使用提交的表单修改数据库中的现有数据行。此路由和模板正确地将数据加载到我的表单中：

@app.route('/match/<int:match_id>/edit', methods=['GET', 'POST'])
@login_required
def match_edit(match_id):
    match = db.session.query(MatchScore).get(match_id)
    if match is None:
        abort(404)
    form = MatchScoringForm(request.values, obj=match)
    form.team.choices = [
            (a.id, a.number) for a in Teams.query.filter(
            Teams.id == match.teams)]
    if request.method == 'POST' and form.validate_on_submit():
        form.populate_obj(match)
        db.session.commit()
        flash('Score Updated Successfully')
        return redirect(url_for('match'))
    elif request.method == 'GET':
        return render_template('match.html',
                               form=form,
                               match=match)

来自模板的表单控件行：

form action="{{ url_for('match_edit', match_id=match.id) }}" method="post"

但是，在尝试提交更新时，我在路线上方的form.populate_obj上收到错误：

AttributeError
AttributeError: 'int' object has no attribute '_sa_instance_state'

Traceback (most recent call last)
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/flask/app.py", line 2000, in __call__
return self.wsgi_app(environ, start_response)
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/flask/app.py", line 1991, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/flask/app.py", line 1567, in handle_exception
reraise(exc_type, exc_value, tb)
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/flask/app.py", line 1988, in wsgi_app
response = self.full_dispatch_request()
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/flask/app.py", line 1641, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/flask/app.py", line 1544, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/flask/app.py", line 1639, in full_dispatch_request
rv = self.dispatch_request()
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/flask/app.py", line 1625, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/flask_login/utils.py", line 228, in decorated_view
return func(*args, **kwargs)
File "/Users/rahm/PycharmProjects/VVScouting/app/views.py", line 341, in match_edit
form.populate_obj(match)
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/wtforms/form.py", line 96, in populate_obj
field.populate_obj(obj, name)
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/wtforms/fields/core.py", line 327, in populate_obj
setattr(obj, name, self.data)
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 224, in __set__
instance_dict(instance), value, None)
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 812, in set
value = self.fire_replace_event(state, dict_, value, old, initiator)
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 834, in fire_replace_event
self._replace_token or self._init_append_or_replace_token())
File "/Users/rahm/PycharmProjects/VVScouting/env/lib/python2.7/site-packages/sqlalchemy/orm/unitofwork.py", line 86, in set_
newvalue_state = attributes.instance_state(newvalue)
AttributeError: 'int' object has no attribute '_sa_instance_state'

但是，如果我只是强制执行sql，它可以正常工作：

@app.route('/match/<int:match_id>/edit', methods=['GET', 'POST'])
@login_required
def match_edit(match_id):
    match = db.session.query(MatchScore).get(match_id)
    if match is None:
        abort(404)
    form = MatchScoringForm(request.values, obj=match)
    form.team.choices = [
            (a.id, a.number) for a in Teams.query.filter(
            Teams.id == match.teams)]
    if request.method == 'POST' and form.validate_on_submit():
        postdata = request.values
        t_capball_tried = True if 't_capball' in request.form else False
        sql_text = '''update MatchScore set match_number="%s", \
                        a_center_vortex=%d, \
                        a_center_vortex_miss=%d, \
                        a_beacon=%d, \
                        a_beacon_miss=%d, \
                        a_capball=%d, \
                        a_park=%d, \
                        t_center_vortex=%d, \
                        t_center_vortex_miss=%d, \
                        t_beacon=%d, \
                        t_beacons_pushed=%d, \
                        t_capball=%d, \
                        t_capball_tried=%d, \
                        a_score=%d, \
                        t_score=%d, \
                        total_score=%d, \
                        match_notes="%s" where id = %d''' % (
            str(postdata['match_number']),
            int(postdata['a_center_vortex']),
            int(postdata['a_center_vortex_miss']),
            int(postdata['a_beacon']),
            int(postdata['a_beacon_miss']),
            int(postdata['a_capball']),
            int(postdata['a_park']),
            int(postdata['t_center_vortex']),
            int(postdata['t_center_vortex_miss']),
            int(postdata['t_beacon']),
            int(postdata['t_beacons_pushed']),
            int(postdata['t_capball']),
            t_capball_tried,
            int(postdata['a_score']),
            int(postdata['t_score']),
            int(postdata['total_score']),
            str(postdata['match_notes']),
            match_id)
        result = db.engine.execute(sql_text)
        # form.populate_obj(match)
        # db.session.commit()
        flash('Score Updated Successfully')
        return redirect(url_for('match_edit', match_id=match_id))

任何有关修复我的方法或更好方法的指示都会有所帮助。

使用现有的Flask WTF表单编辑数据

0 个答案: