Many-to-Many Association Object SQLAlchemy Issues
0
I'm back with another SQL Alchemy question..
So I have a many-to-many relationship between two classes: Dataset and Column (ignore the obvious horrible names).
I was using an association table before and everything was working great. But I now need to add an extra column to that association table so I had to convert the table to an object.
I'm following the docs but I keep getting this error:
AssertionError: Attribute 'datasets' on class '<class 'test_models.Table'>' doesn't handle objects of type '<class 'test_models.Dataset'>'
My Setup
class Dataset(BASE):
__tablename__ = 'dataset'
dataset_id = Column(INTEGER(10), primary_key=True, unique=True, nullable=False)
dataset_name = Column(Text, nullable=False)
dataset_title = Column(Text)
dataset_comment = Column(Text)
tables = relationship('Dataset_Table',
back_populates='datasets')
class Table(BASE):
__tablename__ = 'table'
table_id = Column(INTEGER(11), primary_key=True, unique=True, nullable=False)
table_name = Column(Text, nullable=False)
table_group = Column(Text)
table_description = Column(Text)
table_longitudinal = Column(Enum('S', 'Y', 'N', 'L'))
datasets = relationship('Dataset_Table',
back_populates='tables')
Here's is a link to the full stack trace: https://pastebin.com/NHgLCWq6
Is my approach incorrect? What am I doing wrong? I simply want my many-to-many to work with the associative table as before with the Association Table but with an Association Object
EDIT:
I apologize, I didn't include the association table linking the two tables above together:
class Dataset_Table(BASE):
__tablename__ = 'dataset_table'
id = Column('id', INTEGER, primary_key=True, unique=True, nullable=False)
dataset_id = Column('dataset_id', INTEGER, ForeignKey('dataset.dataset_id'), nullable=False)
table_id = Column('table_id', INTEGER, ForeignKey('table.table_id'), nullable=False)
position = Column(INTEGER, nullable=False)
datasets = relationship('Dataset',
back_populates='tables')
tables = relationship('Table',
back_populates='datasets')
As you can see, this is a standard many-to-many with back population like this
Im putting the full stack trace below:
Traceback (most recent call last):
File "/Users/kevin.dasilva/SQL_tings/SQL_ingest.py", line 103, in <module>
sess.add_all(objs)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1785, in add_all
self.add(instance, _warn=False)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1776, in add
self._save_or_update_state(state)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1795, in
_save_or_update_state
halt_on=self._contains_state):
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/mapper.py", line 2870, in cascade_iterator
visited_states, halt_on))
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/relationships.py", line 1591, in
cascade_iterator
c.__class__
AssertionError: Attribute 'datasets' on class '<class
'test_models.Table'>' doesn't handle objects of type '<class
'test_models.Dataset'>'
EDIT:
I believe I am searching for a "bidirectional many to many" with an association object
python sqlalchemy
asked Nov 12 '18 at 22:45
Kevin DasilvaKevin Dasilva
112
add a comment |
0
I'm back with another SQL Alchemy question..
So I have a many-to-many relationship between two classes: Dataset and Column (ignore the obvious horrible names).
I was using an association table before and everything was working great. But I now need to add an extra column to that association table so I had to convert the table to an object.
I'm following the docs but I keep getting this error:
AssertionError: Attribute 'datasets' on class '<class 'test_models.Table'>' doesn't handle objects of type '<class 'test_models.Dataset'>'
My Setup
class Dataset(BASE):
__tablename__ = 'dataset'
dataset_id = Column(INTEGER(10), primary_key=True, unique=True, nullable=False)
dataset_name = Column(Text, nullable=False)
dataset_title = Column(Text)
dataset_comment = Column(Text)
tables = relationship('Dataset_Table',
back_populates='datasets')
class Table(BASE):
__tablename__ = 'table'
table_id = Column(INTEGER(11), primary_key=True, unique=True, nullable=False)
table_name = Column(Text, nullable=False)
table_group = Column(Text)
table_description = Column(Text)
table_longitudinal = Column(Enum('S', 'Y', 'N', 'L'))
datasets = relationship('Dataset_Table',
back_populates='tables')
Here's is a link to the full stack trace: https://pastebin.com/NHgLCWq6
Is my approach incorrect? What am I doing wrong? I simply want my many-to-many to work with the associative table as before with the Association Table but with an Association Object
EDIT:
I apologize, I didn't include the association table linking the two tables above together:
class Dataset_Table(BASE):
__tablename__ = 'dataset_table'
id = Column('id', INTEGER, primary_key=True, unique=True, nullable=False)
dataset_id = Column('dataset_id', INTEGER, ForeignKey('dataset.dataset_id'), nullable=False)
table_id = Column('table_id', INTEGER, ForeignKey('table.table_id'), nullable=False)
position = Column(INTEGER, nullable=False)
datasets = relationship('Dataset',
back_populates='tables')
tables = relationship('Table',
back_populates='datasets')
As you can see, this is a standard many-to-many with back population like this
Im putting the full stack trace below:
Traceback (most recent call last):
File "/Users/kevin.dasilva/SQL_tings/SQL_ingest.py", line 103, in <module>
sess.add_all(objs)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1785, in add_all
self.add(instance, _warn=False)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1776, in add
self._save_or_update_state(state)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1795, in
_save_or_update_state
halt_on=self._contains_state):
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/mapper.py", line 2870, in cascade_iterator
visited_states, halt_on))
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/relationships.py", line 1591, in
cascade_iterator
c.__class__
AssertionError: Attribute 'datasets' on class '<class
'test_models.Table'>' doesn't handle objects of type '<class
'test_models.Dataset'>'
EDIT:
I believe I am searching for a "bidirectional many to many" with an association object
python sqlalchemy
asked Nov 12 '18 at 22:45
Kevin DasilvaKevin Dasilva
112
Hi Kevin, I'd like to be able to help but you haven't included enough code for me to reproduce the issue. Please include a Minimal, Complete and Verifiable Example. From the error message it looks like you are trying to add instances oftest_models.DatasettoTable.datasetsbut that relationship is defined to handleDataset_Tableinstances (and that model isn't included in your example code). Also, include the stack trace in the body of your question as opposed to an external link (and the stack trace in the link doesn't look to be complete).
– SuperShoot
Nov 13 '18 at 9:04
Thank you for your feedback! I totally forgot a vital model there.. Im going to add everything now.
– Kevin Dasilva
Nov 13 '18 at 18:07
That’s still not a MCVE. Where is the code that includes this line:sess.add_all(objs)? That is where the error is originating from.
– SuperShoot
Nov 14 '18 at 0:48
add a comment |
0
0
0
I'm back with another SQL Alchemy question..
So I have a many-to-many relationship between two classes: Dataset and Column (ignore the obvious horrible names).
I was using an association table before and everything was working great. But I now need to add an extra column to that association table so I had to convert the table to an object.
I'm following the docs but I keep getting this error:
AssertionError: Attribute 'datasets' on class '<class 'test_models.Table'>' doesn't handle objects of type '<class 'test_models.Dataset'>'
My Setup
class Dataset(BASE):
__tablename__ = 'dataset'
dataset_id = Column(INTEGER(10), primary_key=True, unique=True, nullable=False)
dataset_name = Column(Text, nullable=False)
dataset_title = Column(Text)
dataset_comment = Column(Text)
tables = relationship('Dataset_Table',
back_populates='datasets')
class Table(BASE):
__tablename__ = 'table'
table_id = Column(INTEGER(11), primary_key=True, unique=True, nullable=False)
table_name = Column(Text, nullable=False)
table_group = Column(Text)
table_description = Column(Text)
table_longitudinal = Column(Enum('S', 'Y', 'N', 'L'))
datasets = relationship('Dataset_Table',
back_populates='tables')
Here's is a link to the full stack trace: https://pastebin.com/NHgLCWq6
Is my approach incorrect? What am I doing wrong? I simply want my many-to-many to work with the associative table as before with the Association Table but with an Association Object
EDIT:
I apologize, I didn't include the association table linking the two tables above together:
class Dataset_Table(BASE):
__tablename__ = 'dataset_table'
id = Column('id', INTEGER, primary_key=True, unique=True, nullable=False)
dataset_id = Column('dataset_id', INTEGER, ForeignKey('dataset.dataset_id'), nullable=False)
table_id = Column('table_id', INTEGER, ForeignKey('table.table_id'), nullable=False)
position = Column(INTEGER, nullable=False)
datasets = relationship('Dataset',
back_populates='tables')
tables = relationship('Table',
back_populates='datasets')
As you can see, this is a standard many-to-many with back population like this
Im putting the full stack trace below:
Traceback (most recent call last):
File "/Users/kevin.dasilva/SQL_tings/SQL_ingest.py", line 103, in <module>
sess.add_all(objs)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1785, in add_all
self.add(instance, _warn=False)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1776, in add
self._save_or_update_state(state)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1795, in
_save_or_update_state
halt_on=self._contains_state):
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/mapper.py", line 2870, in cascade_iterator
visited_states, halt_on))
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/relationships.py", line 1591, in
cascade_iterator
c.__class__
AssertionError: Attribute 'datasets' on class '<class
'test_models.Table'>' doesn't handle objects of type '<class
'test_models.Dataset'>'
EDIT:
I believe I am searching for a "bidirectional many to many" with an association object
python sqlalchemy
asked Nov 12 '18 at 22:45
Kevin DasilvaKevin Dasilva
112
I'm back with another SQL Alchemy question..
So I have a many-to-many relationship between two classes: Dataset and Column (ignore the obvious horrible names).
I was using an association table before and everything was working great. But I now need to add an extra column to that association table so I had to convert the table to an object.
I'm following the docs but I keep getting this error:
AssertionError: Attribute 'datasets' on class '<class 'test_models.Table'>' doesn't handle objects of type '<class 'test_models.Dataset'>'
My Setup
class Dataset(BASE):
__tablename__ = 'dataset'
dataset_id = Column(INTEGER(10), primary_key=True, unique=True, nullable=False)
dataset_name = Column(Text, nullable=False)
dataset_title = Column(Text)
dataset_comment = Column(Text)
tables = relationship('Dataset_Table',
back_populates='datasets')
class Table(BASE):
__tablename__ = 'table'
table_id = Column(INTEGER(11), primary_key=True, unique=True, nullable=False)
table_name = Column(Text, nullable=False)
table_group = Column(Text)
table_description = Column(Text)
table_longitudinal = Column(Enum('S', 'Y', 'N', 'L'))
datasets = relationship('Dataset_Table',
back_populates='tables')
Here's is a link to the full stack trace: https://pastebin.com/NHgLCWq6
Is my approach incorrect? What am I doing wrong? I simply want my many-to-many to work with the associative table as before with the Association Table but with an Association Object
EDIT:
I apologize, I didn't include the association table linking the two tables above together:
class Dataset_Table(BASE):
__tablename__ = 'dataset_table'
id = Column('id', INTEGER, primary_key=True, unique=True, nullable=False)
dataset_id = Column('dataset_id', INTEGER, ForeignKey('dataset.dataset_id'), nullable=False)
table_id = Column('table_id', INTEGER, ForeignKey('table.table_id'), nullable=False)
position = Column(INTEGER, nullable=False)
datasets = relationship('Dataset',
back_populates='tables')
tables = relationship('Table',
back_populates='datasets')
As you can see, this is a standard many-to-many with back population like this
Im putting the full stack trace below:
Traceback (most recent call last):
File "/Users/kevin.dasilva/SQL_tings/SQL_ingest.py", line 103, in <module>
sess.add_all(objs)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1785, in add_all
self.add(instance, _warn=False)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1776, in add
self._save_or_update_state(state)
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/session.py", line 1795, in
_save_or_update_state
halt_on=self._contains_state):
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/mapper.py", line 2870, in cascade_iterator
visited_states, halt_on))
File "/Users/kevin.dasilva/SQL_tings/SQL_env/lib/python3.6/site-
packages/sqlalchemy/orm/relationships.py", line 1591, in
cascade_iterator
c.__class__
AssertionError: Attribute 'datasets' on class '<class
'test_models.Table'>' doesn't handle objects of type '<class
'test_models.Dataset'>'
EDIT:
I believe I am searching for a "bidirectional many to many" with an association object
python sqlalchemy
python sqlalchemy
asked Nov 12 '18 at 22:45
Kevin DasilvaKevin Dasilva
112
asked Nov 12 '18 at 22:45
Kevin DasilvaKevin Dasilva
112
edited Nov 13 '18 at 19:35
Kevin Dasilva
asked Nov 12 '18 at 22:45
Kevin DasilvaKevin Dasilva
112
asked Nov 12 '18 at 22:45
Kevin DasilvaKevin Dasilva
112
asked Nov 12 '18 at 22:45
Kevin DasilvaKevin Dasilva
112
112
Hi Kevin, I'd like to be able to help but you haven't included enough code for me to reproduce the issue. Please include a Minimal, Complete and Verifiable Example. From the error message it looks like you are trying to add instances oftest_models.DatasettoTable.datasetsbut that relationship is defined to handleDataset_Tableinstances (and that model isn't included in your example code). Also, include the stack trace in the body of your question as opposed to an external link (and the stack trace in the link doesn't look to be complete).
– SuperShoot
Nov 13 '18 at 9:04
Thank you for your feedback! I totally forgot a vital model there.. Im going to add everything now.
– Kevin Dasilva
Nov 13 '18 at 18:07
That’s still not a MCVE. Where is the code that includes this line:sess.add_all(objs)? That is where the error is originating from.
– SuperShoot
Nov 14 '18 at 0:48
add a comment |
Hi Kevin, I'd like to be able to help but you haven't included enough code for me to reproduce the issue. Please include a Minimal, Complete and Verifiable Example. From the error message it looks like you are trying to add instances oftest_models.DatasettoTable.datasetsbut that relationship is defined to handleDataset_Tableinstances (and that model isn't included in your example code). Also, include the stack trace in the body of your question as opposed to an external link (and the stack trace in the link doesn't look to be complete).
– SuperShoot
Nov 13 '18 at 9:04
Thank you for your feedback! I totally forgot a vital model there.. Im going to add everything now.
– Kevin Dasilva
Nov 13 '18 at 18:07
That’s still not a MCVE. Where is the code that includes this line:sess.add_all(objs)? That is where the error is originating from.
– SuperShoot
Nov 14 '18 at 0:48
Hi Kevin, I'd like to be able to help but you haven't included enough code for me to reproduce the issue. Please include a Minimal, Complete and Verifiable Example. From the error message it looks like you are trying to add instances of
test_models.Dataset to Table.datasets but that relationship is defined to handle Dataset_Table instances (and that model isn't included in your example code). Also, include the stack trace in the body of your question as opposed to an external link (and the stack trace in the link doesn't look to be complete).– SuperShoot
Nov 13 '18 at 9:04
Hi Kevin, I'd like to be able to help but you haven't included enough code for me to reproduce the issue. Please include a Minimal, Complete and Verifiable Example. From the error message it looks like you are trying to add instances of
test_models.Dataset to Table.datasets but that relationship is defined to handle Dataset_Table instances (and that model isn't included in your example code). Also, include the stack trace in the body of your question as opposed to an external link (and the stack trace in the link doesn't look to be complete).– SuperShoot
Nov 13 '18 at 9:04
Thank you for your feedback! I totally forgot a vital model there.. Im going to add everything now.
– Kevin Dasilva
Nov 13 '18 at 18:07
Thank you for your feedback! I totally forgot a vital model there.. Im going to add everything now.
– Kevin Dasilva
Nov 13 '18 at 18:07
That’s still not a MCVE. Where is the code that includes this line:
sess.add_all(objs)? That is where the error is originating from.– SuperShoot
Nov 14 '18 at 0:48
That’s still not a MCVE. Where is the code that includes this line:
sess.add_all(objs)? That is where the error is originating from.– SuperShoot
Nov 14 '18 at 0:48
add a comment |
0
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Hi Kevin, I'd like to be able to help but you haven't included enough code for me to reproduce the issue. Please include a Minimal, Complete and Verifiable Example. From the error message it looks like you are trying to add instances of
test_models.DatasettoTable.datasetsbut that relationship is defined to handleDataset_Tableinstances (and that model isn't included in your example code). Also, include the stack trace in the body of your question as opposed to an external link (and the stack trace in the link doesn't look to be complete).– SuperShoot
Nov 13 '18 at 9:04
Thank you for your feedback! I totally forgot a vital model there.. Im going to add everything now.
– Kevin Dasilva
Nov 13 '18 at 18:07
That’s still not a MCVE. Where is the code that includes this line:
sess.add_all(objs)? That is where the error is originating from.– SuperShoot
Nov 14 '18 at 0:48