[英]Flask-sqlalchemy with Blueprints - RuntimeError: No application found. Either work inside a view function or push an application context
There are a lot of questions regarding this but none of them are using Flask Blueprints.有很多关于此的问题,但没有一个使用 Flask 蓝图。
I am trying to set up a QuerySelectField with a sqlite3 lookup.我正在尝试使用 sqlite3 查找设置 QuerySelectField。 But I get then error:
但我得到了错误:
RuntimeError: No application found. Either work inside a view function or push an application context.
Here is my application structure:这是我的应用程序结构:
My init .py我的初始化.py
from flask import Flask, render_template, current_app
from flask_mail import Mail
from flask_login import LoginManager
from flask_bootstrap import Bootstrap
from flask_ckeditor import CKEditor
from instance.config import app_config
from app.views.ticket import ticket as ticket_blueprint
from app.views.users import users as user_blueprint
from app.views.main import main as main_blueprint
from app.models import User, db
login_manager = LoginManager()
def page_not_found(e):
return render_template('404.html'), 404
def register_blueprints_on_app(app):
app.register_blueprint(user_blueprint)
app.register_blueprint(ticket_blueprint)
app.register_blueprint(main_blueprint)
def login_manager_init(app):
login_manager.login_view = 'users.login'
login_manager.init_app(app)
# associate id in the cookie with the User object
@login_manager.user_loader
def load_user(user_id):
print(user_id)
return User.query.get(user_id)
# application factory
def create_app(config):
# create application instance
app = Flask(__name__, instance_relative_config=True)
app.register_error_handler(404, page_not_found)
app.config.from_object(app_config[config])
app.config.from_pyfile('config.py')
Bootstrap(app)
mail = Mail()
mail.init_app(app)
db.init_app(app)
ckeditor = CKEditor()
ckeditor.init_app(app)
login_manager_init(app)
register_blueprints_on_app(app)
return app
And here is the problematic forms.py which is under ticket/views/这是有问题的 forms.py,它位于 ticket/views/ 下
from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField, TextAreaField, FieldList, DateTimeField, SelectField
from wtforms_sqlalchemy.fields import QuerySelectField
from wtforms.fields.html5 import EmailField, TelField
from wtforms.validators import InputRequired, Email
from flask_ckeditor import CKEditorField
from app.models import User
def user_query():
query = User.query()
return query
class TicketForm(FlaskForm):
requested_by = QuerySelectField(label='Requested by',
query_factory=user_query(),
allow_blank=False,
get_label='fullname')
department = SelectField(label='Department')
phone = TelField(label='Phone')
email = EmailField(label='Email', validators=[Email('Enter a valid email address')])
short_desc = StringField(label='Short Description', validators=[InputRequired('Must enter a short description')])
description = CKEditorField(label='Description')
classification = StringField(label='Classification')
priority = StringField(label='Priority')
sla_respond_by = DateTimeField(label='Respond by', render_kw={'readonly': True})
sla_resolve_by = DateTimeField(label='Resolve by', render_kw={'readonly': True})
sla_status = StringField(label='SLA Status', render_kw={'readonly': True})
related_tickets = FieldList(StringField(label='Ticker #'))
client_journal = TextAreaField(label='Client Area')
work_notes = TextAreaField(label='Work Notes')
closed_at = DateTimeField(label='Closed')
closed_by = StringField(label='Closed by')
followed_by = StringField(label='Followed by')
submit = SubmitField('Save')
The problem part is when this runs问题部分是什么时候运行
def user_query():
query = User.query()
return query
I get the error.我得到了错误。
For context here is the routes file under ticket/view这里的上下文是票证/视图下的路由文件
from flask import render_template
from app.views.ticket.forms import TicketForm
from flask_login import login_required
from . import ticket
@ticket.get('/ticket')
@ticket.put('/ticket')
@login_required
def ticket():
form = TicketForm()
return render_template('ticket.html', form=form)
And in ticket/view/ init .py并在票证/视图/ init .py
from flask import Blueprint
ticket = Blueprint('ticket', __name__, static_folder='static', template_folder='templates')
from . import routes
I read the doc here but it was no help.我在这里阅读了文档,但没有帮助。 https://flask-sqlalchemy.palletsprojects.com/en/2.x/contexts/
https://flask-sqlalchemy.palletsprojects.com/en/2.x/contexts/
I can't work out how to pass the application context so this function works.我无法弄清楚如何传递应用程序上下文以使此函数起作用。
I got around this by not using a query_factory in the QuerySelectfield.我通过在 QuerySelectfield 中不使用 query_factory 来解决这个问题。
I changed the field declaration from this:我从此更改了字段声明:
class TicketForm(FlaskForm):
requested_by = QuerySelectField(label='Requested by',
query_factory=user_query(),
allow_blank=False,
get_label='full_name')
To this:对此:
class TicketForm(FlaskForm):
requested_by = QuerySelectField(label='Requested by',
allow_blank=False,
get_label='full_name')
(so, just removed query_factory=user_query(),) (所以,刚刚删除了 query_factory=user_query(),)
I deleted this:我删除了这个:
def user_query():
query = User.query()
return query
Then added this to the route in my Blueprint:然后将其添加到我的蓝图中的路线中:
@ticket.get('/ticket')
@ticket.put('/ticket')
@login_required
def ticket():
form = TicketForm()
form.requested_by.query = User.query.all() # Added this
print(current_app.app_context())
return render_template('ticket.html', form=form)
I hope that helps someone as it was doing my head in. I'd still like to know how to do it the other way with a query_factory as I'm sure there is a way.我希望这对我的头脑有所帮助。我仍然想知道如何使用 query_factory 以另一种方式做到这一点,因为我确定有一种方法。 So if anyone knows please share!
所以如果有人知道请分享!
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