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Flask - (ProgrammingError) - Foreign key constraint when building postgresql database


Flask - (ProgrammingError) - Foreign key constraint when building postgresql database

By : leo3065
Date : November 16 2020, 06:23 AM
To fix the issue you can do Type mismatch problem: You defined the foreign key as String type for Role table:
user_id = db.Column(db.String, db.ForeignKey('user.id'))
code :


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sqlalchemy.exc.ProgrammingError: (ProgrammingError) there is no unique constraint matching given keys for referenced tab

sqlalchemy.exc.ProgrammingError: (ProgrammingError) there is no unique constraint matching given keys for referenced tab


By : Bharan Kumar Yeluru
Date : March 29 2020, 07:55 AM
around this issue I just figured out, in this case I need to have a multicolumn foreig key constraints: Changed my section model to be:
code :
class Section(Base):
    __tablename__ = 'section'
    course_id = Column(String(256), ForeignKey('course.course_id'), primary_key = True)
    building = Column(String(256))
    room_no = Column(String(256))
    __table_args__ = (ForeignKeyConstraint([building, room_no],[Classroom.building, Classroom.room_no]), {})
Can't compare datetime in Postgresql sqlalchemy.exc.ProgrammingError ProgrammingError: (ProgrammingError) can't adapt ty

Can't compare datetime in Postgresql sqlalchemy.exc.ProgrammingError ProgrammingError: (ProgrammingError) can't adapt ty


By : mahidhar
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Datetime columns in Flask-SQLAlchemy are datetime objects. You're using time module to parse.
Try:
code :
from_date = datetime.datetime.strptime(request.args['from_attendance'],'%m/%d/%Y')
Flask Foreign Key Constraint

Flask Foreign Key Constraint


By : Roy Herzel
Date : March 29 2020, 07:55 AM
hop of those help? So I find how to do it with this stackoverflow question , I find how to force foreign Key Constraint.
I juste add this in __init__.py and change nothing to models.py
code :
@event.listens_for(Engine, "connect")
    def _set_sqlite_pragma(dbapi_connection, connection_record):
         if isinstance(dbapi_connection, SQLite3Connection):
              cursor = dbapi_connection.cursor()
              cursor.execute("PRAGMA foreign_keys=ON;")
              cursor.close()
How to insert data to postgresql database with flask - sqlalchemy.exc.ProgrammingError?

How to insert data to postgresql database with flask - sqlalchemy.exc.ProgrammingError?


By : sajidrs
Date : March 29 2020, 07:55 AM
will be helpful for those in need I wouldn't use id as a class attribute name. You are assigning the id global function to self.id in the initializer which is the cause of the traceback.
Sqlalchemy/Flask/Postgres ProgrammingError: <unprintable ProgrammingError object>

Sqlalchemy/Flask/Postgres ProgrammingError: <unprintable ProgrammingError object>


By : Avocado
Date : March 29 2020, 07:55 AM
I wish this help you I'm setting up an app in Flask and I just introduced a new table "StudyGroup" to my database schema. I'm still testing so I'm just drop-create-loading the database until everything works. I'm using Flask-Security in my user models which is where the UserMixin part comes from. , The error is probably happening where you do
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