Question

我将网站部署到运行Postgresql的Heroku。以前，我在运行sqlite的flask开发环境中使用过它。使用计划视图时，该应用程序运行良好，但是当我从Heroku访问计划视图时，出现错误。

CLASS

class Task(db.Model):

id = db.Column(db.Integer, primary_key=True)

name = db.Column(db.String(80), index=True)

description = db.Column(db.String(200), index=True)

priority = db.Column(db.Integer)

is_complete = db.Column(db.Boolean)  ####might be trouble

url = db.Column(db.String(200), index=True)

est_dur = db.Column(db.Integer)
time_quad = db.Column(db.Integer)

timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)

user_id = db.Column(db.Integer, db.ForeignKey('user.id'))

路线

@bp.route('/schedule')
#@login_required
def schedule():


currentUser = current_user.id

q1 = Task.query.filter_by(time_quad=1).filter_by(user_id=currentUser).filter_by(is_complete=0).all()

q2 = Task.query.filter_by(time_quad=2).filter_by(user_id=currentUser).filter_by(is_complete=0).all()

q3 = Task.query.filter_by(time_quad=3).filter_by(user_id=currentUser).filter_by(is_complete=0).all()

q4 = Task.query.filter_by(time_quad=4).filter_by(user_id=currentUser).filter_by(is_complete=0).all()

taskAll = q1 + q2 + q3 + q4


print("current user" + str(currentUser))


return render_template('schedule.html', taskList = taskAll)

错误

Exception on /schedule [GET]
Traceback (most recent call last):
  File "/app/.heroku/python/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
    context)
  File "/app/.heroku/python/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 509, in do_execute
    cursor.execute(statement, parameters)
psycopg2.ProgrammingError: operator does not exist: boolean = integer
LINE 3: ....time_quad = 1 AND task.user_id = 1 AND task.is_complete = 0


HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
 [SQL: 'SELECT task.id AS task_id, task.name AS task_name, task.description AS task_description, task.priority AS task_priority, task.is_complete AS task_is_complete, task.url AS task_url, task.est_dur AS task_est_dur, task.time_quad AS task_time_quad, task.timestamp AS task_timestamp, task.user_id AS task_user_id \nFROM task \nWHERE task.time_quad = %(time_quad_1)s AND task.user_id = %(user_id_1)s AND task.is_complete = %(is_complete_1)s'] [parameters: {'time_quad_1': 1, 'user_id_1': 1, 'is_complete_1': 0}] (Background on this error at: http://sqlalche.me/e/f405)

Answer 1

PostgreSQL有一个真正的布尔类型，但SQLite没有，SQLite通常分别使用true和false分别为1和0。当你这样说：

filter_by(is_complete=0)

0将被SQLite解释为“假”，而被PostgreSQL解释为仅是零。因此，Heroku抱怨无法在task.is_complete = 0中比较布尔值和整数。如果您的意思是“假”，请这样说：

filter_by(is_complete=False)

与SQLite对话时应将其转换为零，与PostgreSQL对话时应将其转换为正确的布尔值'f'（或false）。

修复此问题后，强烈建议您在开发环境中安装PostgreSQL（如果这是要在其上进行部署的数据库）。如果您在同一堆栈上进行开发，测试和部署，那么您的工作时间将会大大缩短。

Heroku Postgresql运算符不存在

1 个答案: