使用wtforms和sqlalchemy生成數據庫中的用戶下拉列表

Question

我想生成一個下拉列表中的所有用戶在我的數據庫中，因此我可以稍後分配管理員可以編輯他們的信息。我不斷從我的模板，得到以下錯誤：

AttributeError: 'QueryAllUsers' object has no attribute '_fields' 

views.py

@app.route('/mobility_add_users', methods=['GET', 'POST']) 
@login_required 
def mobility_add_users(): 
    #users=User.query.all() 
    form=QueryAllUsers(request.form) 
    return render_template('mobility_add_users.html',title='Mobility Add Users', form=form) 

forms.py

class QueryAllUsers(Form): 
    print("In QueryAll") 
    #users=User.query.all() 
    user_list = SelectField(u'Choose') 

    def __init__(self, *args, **kwargs): 
     self.user_list.choices=[(obj.id, obj.username) for obj in User.query.order_by('username')] 
    print("Query all done") 

models.py

class User(db.Model): 
    id = db.Column(db.Integer, primary_key=True) 
    username = db.Column(db.String(32), index=True, unique=True) 
    password_hash = db.Column(db.String(128)) 
    email = db.Column(db.String(120), index=True, unique=True) 
    posts = db.relationship('Post', backref='author', lazy='dynamic') 
    #mobilitys = db.relationship('Mobility', backref='username', lazy='dynamic') 
    about_me = db.Column(db.String(140)) 
    last_seen = db.Column(db.DateTime) 

mobility_add_users.html

<!-- extend base layout --> 
{% extends "base.html" %} 

{% block content %} 
    {% from "_formhelpers.html" import render_field %} 
    <form method=post> 
     <dl> 
      {{ form.hidden_tag() }} 
     {{ render_field(form.query) }} 
     </dl> 
     <p><input type=submit value=Register></p> 
    </form> 
{% endblock %} 

更多錯誤的回讀

File "/home/jsnyder10/Documents/45/app/templates/mobility_add_users.html", line 8, in block "content" 

{{ form.hidden_tag() }} 

File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask_wtf/form.py", line 135, in hidden_tag 

u'\n'.join(text_type(f) for f in hidden_fields(fields or self)) 

File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask_wtf/form.py", line 135, in <genexpr> 

u'\n'.join(text_type(f) for f in hidden_fields(fields or self)) 

File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/flask_wtf/form.py", line 125, in hidden_fields 

for f in fields: 

File "/home/jsnyder10/Documents/45/flask/lib/python2.7/site-packages/wtforms/form.py", line 57, in __iter__ 

return iter(itervalues(self._fields)) 

我還是新來這個，所以請去容易在我身上。

Answer 1

希望這會有所幫助。

from wtforms.ext.sqlalchemy.fields import QuerySelectField 


class QueryAllUsers(Form): 
    user_list = QuerySelectField(
     'Choose', 
     query_factory=lambda: User.query, // you can add order_by(I am not sure) 
     allow_blank=False 
    ) 


class User(db.Model): 
    // add below lines to your model. you can refactor this as per your need. 
    def __repr__(self): 
     return "<User(id='%s', name='%s')>" % (self.id, self.name) 

Answer 2

形式不正確的意見進行初始化，應該是：

@app.route('/mobility_add_users', methods=['GET', 'POST']) 
@login_required 
def mobility_add_users(): 
    #users=User.query.all() 
    form=QueryAllUsers(request.form) 
    return render_template('mobility_add_users.html',title='Mobility Add Users', form=form) 

參考wtforms文檔。