flask-sqlalchemy

SQLAlchemy cannot find referenced table via foreignkey in many-to-many relationship Question: I have already succeeded in adding one many-to-many relationship in my database. However, when trying to add another, I am met with: sqlalchemy.exc.NoReferencedTableError: Foreign key associated with column ‘user_shiftTemplate.template_id’ could not find table ‘shifttemplate’ with which to generate a foreign key to target column …

SQLAlchemy column passed as dropdown list in WTForm Flask Question: I want to take the values of a column named hotelName from Hotel model and populate with them a dropdown list. I have tried this as a way to put them in my wtform: class RoomForm(FlaskForm): hotel = SelectField(choices=[(h, h) for h in Hotel.hotelName.property.columns[0].type But …

Fetch two columns from db using SQLalchemy Question: I am learning python and trying to create a drop-down in my form with the data from another table. here is my code Models.py class empmasterModel(db.Model): __tablename__ = "empmaster" Empnum = db.Column(db.Integer, primary_key=True) Employee_Number = db.Column(db.Integer(),primary_key=True,unique = True) Employee_Name = db.Column(db.String()) Employee_Type = db.Column(db.String()) Coreid = db.Column(db.String()) …

Flask-Sqlalchemy pagination – how to paginate through a table when there are multiple tables on same page Question: I would like to have multiple tables on the same page and to be able to paginate through these tables individually. Currently if I click Next to go to the next page of results for a table …

understand setting up database using sqlalchamy and avoid errorAttributeError: type object 'User' has no attribute 'query' in flask app Question: I am a beginner writing a todo app in flask and in writing database application, at least I have never setup db for any production app myself. I have written this code (models.py) that uses …

How to using sum function with encrypted column in SQLAlchemy? Question: I have used EncryptedType from sqlalchemy_utils to encrypt data of the specific column which will make when inserting data into the table or selecting data, the data of encrypted column will be encrypted. This is the ORM structure of my database which have encrypted …

SQLAlchemy Joining 2 CTE Results in Ambiguous ON Clause Question: I’m attempting retrieve a max version for either a published version or, if a resource has no published versions, the highest version. I’m using 3 CTE to find these values, one to get the max version that is published, a second to get the max …

Checking value inside Sqlalchemy queried data Question: I am querying Tags table and storing its values into varialble all_tags = Tag.query.all() # <- Query all existing tags Output: >>> all_tags [<Tag>: STM32, <Tag>: Linux, <Tag>: Unix, <Tag>: Skype, <Tag>: MCU, <Tag>: CPU, <Tag>: Silk, <Tag>: WAN] I am receiving tag values from json client, after …

Strange error when trying to get data from database in another file Question: I was trying to get count of items in databases. Getting count with second database is working as planned, but the first one is giving me this error KeyError: <weakref at 0x000001E85C863330; to "Flask" at 0x000001E8397750D0> This program is a very simplified, …

Python flask not working with url containing "?" Question: I am new to flask and I was trying to make GET request for url containing "?" symbol but it look like my program is just skipping work with it. I am working with flask-sql alchemy, flask and flask-restful. Some simplified look of my program looks …