flask-sqlalchemy

Flask SQL-Alchemy | MySql - Multiple Foreign Keys issues

由 我的梦境 提交于 2019-12-06 07:40:13
class Role(db.Model): __tablename__ = 'roles' id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(64), unique=True) default = db.Column(db.Boolean, default=False, index=True) permissions = db.Column(db.Integer) class Devices(db.Model): __tablename__ = 'devices' id = db.Column(db.Integer, primary_key=True) purpose = db.Column('purpose', db.String(64)) type = db.Column('type', db.String(64)) name = db.Column('name', db.String(64)) channel = db.Column('channel', db.Integer) role_id = db.Column('role_id', db.Integer) role_permissions = db.Column('role_permissions', db.Integer)

Populate second dropdown based on the value selected in the first dropdown in flask using ajax and jQuery

由 不打扰是莪最后的温柔 提交于 2019-12-06 07:20:01
问题 I am not getting anywhere on this. Any help regarding this would be greatly appreciated! I have two dropdowns for Managers and Employees. Managers dropdown contains a list of Managers by default. I want to populate Employees dropdown with the employees name by querying a SQL Server database with the Manager name a user selects in Managers dropdown. So for e.g. if a person selects Tom as the Manager in the Managers dropdown then the Employees dropdown should populate with the Employees name

Sort by Count of Many to Many Relationship - SQLAlchemy

由 北慕城南 提交于 2019-12-06 06:40:25
I am using Flask-SQLAlchemy to to query my Postgres database. I am currently trying to query for suggestions of titles with the following query: res = Title.query.filter(Titles.name.ilike(searchstring)).limit(20) So far so good. Now I would like to order the results by the number of "subscribers" each Title object has. I am aware of the following SO question: SQLAlchemy ordering by count on a many to many relationship however its solution did not work for me. I am receiving the following error: ProgrammingError: (ProgrammingError) column "publishers_1.id" must appear in the GROUP BY clause or

Reset id count after table delete()

由 不打扰是莪最后的温柔 提交于 2019-12-06 05:39:54
问题 For testing purposes, I clear (delete) every table before executing code. for table in reversed(db.metadata.sorted_tables): engine.execute(table.delete()) do_stuff() However, the new data's id values start from where the previous id 's left off: First iteration: id | value -----+--------- 1 | hi 2 | there Second iteration (delete table, insert new data): id | value -----+--------- 3 | good 4 | day Is there any way to reset the id count when I delete the table? EDIT: seems I broke it, table is

Using different binds in the same class in Flask-SQLAlchemy

由 末鹿安然 提交于 2019-12-06 05:19:10
问题 I currently have multiple databases with identical Tables and Columns (but different data inside). So clearly I need to use binds to access all of them, but it's apparently not as simple as doing this: class WhateverTable(db.Model): __tablename__ = 'whatevertable' whatever = db.Column(db.String(255)) def __init__(self, bind=None): self.__bind_key__ = bind and then later calling: WhateverTable(bind='bind_key_here').query.filter_by(whatever='whatever').first() Is there a way I can do this

How to access the orm with celery tasks?

由 三世轮回 提交于 2019-12-06 05:16:31
问题 I'm trying to flip a boolean flag for particular types of objects in my database using sqlalchemy+celery beats. But how do I access my orm from the tasks.py file? from models import Book from celery.decorators import periodic_task from application import create_celery_app celery = create_celery_app() # Create celery: http://flask.pocoo.org/docs/0.10/patterns/celery/ # This task works fine @celery.task def celery_send_email(to,subject,template): with current_app.app_context(): msg = Message(

How do I get the number of rows affected with SQL Alchemy?

由 怎甘沉沦 提交于 2019-12-06 04:22:36
问题 How do I get the number of rows affected for an update statement with sqlalchemy? (I am using mysql and python/pyramid): from sqlalchemy.engine.base import ResultProxy @classmethod def myupdate(cls, id, myvalue): DBSession.query(cls).filter(cls.id == id).update({'mycolumn': myvalue}) if ResultProxy.rowcount == 1: return True else: return False Note: I saw this post but according to the docs: "The ‘rowcount’ reports the number of rows matched by the WHERE criterion of an UPDATE or DELETE

Flask-sqlalchemy query datetime intervals

由 限于喜欢 提交于 2019-12-06 03:49:58
I have defined a table with flask-sqlalchemy. Displayed below. class Notes(db.Model): id = db.Column(db.Integer, primary_key=True) notes = db.Column(db.Text, nullable=False) user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False) added_at = db.Column(db.DateTime, default=db.func.now()) @staticmethod def newest(num): return Notes.query.order_by(desc(Notes.added_at)).limit(num) I'm attempting to write a query that is to replace and already existing direct query, which looks like this. select notes,user,added_at from notes where added_at >= now() - INTERVAL 8 HOUR; However based

SQLAlchemy raises QueuePool limit of size 10 overflow 10 reached, connection timed out after some time

由 和自甴很熟 提交于 2019-12-06 03:22:47
While using Flask-SQLAlchemy I get the error 'QueuePool limit of size 10 overflow 10 reached, connection timed out' consistently, after some time. I tried to increase connection pool size, but it only deferred the problem. def create_app(config_name): app = Flask(__name__) app.config.from_object(config[config_name]) config[config_name].init_app(app) initialize_db(app) db = SQLAlchemy() def initialize_db(app): db.init_app(app) SQLALCHEMY_POOL_SIZE = 100 I figured out the problem. The issue was sometimes database connection was going to lost state, which is causing pool size to be Exhausted

Ordering by subquery in SQLAlchemy

由 橙三吉。 提交于 2019-12-06 03:05:53
I'm trying to select the newest threads (Thread) ordered descending by the time of the most recent reply to them (the reply is a Post model, that's a standard forum query). In SQL I'd write it like this: SELECT * FROM thread AS t ORDER BY (SELECT MAX(posted_at) FROM post WHERE thread_id = t.id) DESC How do I do such thing in SQLAlchemy? I tried something like this: scalar = db.select[func.max(Post.posted_at)].where(Post.thread_id == Thread.id).as_scalar() threads = Thread.query.order_by(scalar.desc()).all() But it seems that I don't understand how scalars work. Reading docs for the 5th time
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