[sqlalchemy] Getting error while using MapperExtension
Hi,
In a project, I am using MapperExtension this way:
class TaskExtension(MapperExtension):
def populate_instance(self, mapper, selectcontext, row, instance,
**flags):
mapper.populate_instance(selectcontext, row, instance,
**flags)
instance.on_load() # does some custom initialization
It gives me the following exception:
TypeError: ('Task' object is unsubscriptable...
Needing help.
thanks
Sanjay
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[sqlalchemy] Re: Querying for the existence of an object in the database
Thanks Michael. The classmethod code worked a treat. I see merge() has changed in the new release of SA. Does this affect the solution? --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] PostgreSQL Schema
Hi, How to set schema in sqlalchemy ?.(Set search_path To neithal,public) #neithal.login_f #select([func.login_f(username,password,lang)]) Thanks Madhu Alagu --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: PostgreSQL Schema
On Apr 8, 2008, at 10:33 AM, Madhu Alagu wrote: Hi, How to set schema in sqlalchemy ?.(Set search_path To neithal,public) #neithal.login_f #select([func.login_f(username,password,lang)]) try func.neithal.login_f(xxx) --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Merging Objects Issue
Pardon my probably misuse of terminology in my question below. I've just begun to use SA and am still learning what to call everything :) Overview: I want to create an object in one HTTP request and then retrieve it in a second HTTP request, update it, and finally insert it all to the DB. Yes, this is in a Django app, but the model History() below is an Elixir entity. OK, so I am creating an object, modifying it, and saving it to the session like this: # History is an Elixir object subclassed from Entity history = History() history.account_id = account_id session.save(history) # pickle the object history_pickle = pickle.dumps(history) # pickle is then stored in the HTTP session request.session['history_object'] = history_pickle Now, in a subsequent HTTP request, I take that object out of the session and depickle it. history = pickle.loads(request.session['history_object']) # merge the existing object back into the session session.merge(history) # make further modifications to object history.user_id = user_id ... session.save(history) session.flush() When I do this, I receive this error that seems to occur on the merge(): Class 'History' entity name 'None' has no mapper associated with it. I've tried supplying an entity name in the merge() call, but I'm unsure what that name should be. I also toyed with the dont_load=True attribute since (if I understand save() correctly) this history object will not exist as a row in the DB. Can someone point in the right direction here with what I am trying to do? Thanks! /alex --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Merging Objects Issue
On Apr 8, 11:05 am, Alex Ezell [EMAIL PROTECTED] wrote: When I do this, I receive this error that seems to occur on the merge(): Class 'History' entity name 'None' has no mapper associated with it. I've tried supplying an entity name in the merge() call, but I'm unsure what that name should be. I also toyed with the dont_load=True attribute since (if I understand save() correctly) this history object will not exist as a row in the DB. Can someone point in the right direction here with what I am trying to do? this situation occurs because there is no mapper configured for the History class when it is deserialized into the new HTTP process. the entity_name part of the error is not significant here and I should probably not have it say anything about entity name in the usual case. as to why theres no mapper, for a straight SA application it would be because the module which configures the mappings hasn't yet been imported in that process; for elixir, you might need to do their setup_all() call to ensure their stuff is set up. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Merging Objects Issue
On Apr 8, 10:12 am, Michael Bayer [EMAIL PROTECTED] wrote:
On Apr 8, 11:05 am, Alex Ezell [EMAIL PROTECTED] wrote:
When I do this, I receive this error that seems to occur on the merge():
Class 'History' entity name 'None' has no mapper associated with it.
I've tried supplying an entity name in the merge() call, but I'm
unsure what that name should be. I also toyed with the dont_load=True
attribute since (if I understand save() correctly) this history object
will not exist as a row in the DB.
Can someone point in the right direction here with what I am trying to do?
this situation occurs because there is no mapper configured for the
History class when it is deserialized into the new HTTP process.
the entity_name part of the error is not significant here and I
should probably not have it say anything about entity name in the
usual case.
Thanks for the clarification.
as to why theres no mapper, for a straight SA application it would be
because the module which configures the mappings hasn't yet been
imported in that process; for elixir, you might need to do their
setup_all() call to ensure their stuff is set up.
The setup_all() call seemed to solve the issue with the mapper. Now,
I'm getting an error like:
'ColumnProperty' object has no attribute 'key'
when I attempt the session.merge(). The column it seems to happen with
is defined as:
id = Field(Integer,
PassiveDefault(text(nextval(('history_seq'::text)::regclass))),
colname='history_id', primary_key=True)
This could be because of the interesting PassiveDefault stuff or just
because this is the first field defined in the History() class.
Thanks again for your help. This is SA 0.4.5 in case it matters. ;)
/alex
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[sqlalchemy] Re: has() and multiple tables
On 4/7/08, Jonathan Ellis [EMAIL PROTECTED] wrote: I'm confused -- this sample does correlate actions with tasks, but not tasks with connections. Intuitively it seems that X.has(Y) should always add a clause to the the exists for y.y_id = x.y_id. No? Mike cleared this up for me in IRC: X.prop.has(criterion) just means, exists(select 1 from child where child.id=parent.x_id AND criterion) so the more elegant way to do this is session.query(Action).filter(Action.task.has(Task.connection.has(Connection.caller==caller1))) -Jonathan --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Sqlalchemy Stored Procedures
Would you please post the traceback that you're getting with this?
Note that you don't need the session.begin() and session.flush() with a
transactional sessions, the .begin() is implicit and the .flush() will be
issued by the .commit()
On Tue, Apr 8, 2008 at 1:51 AM, Madhu Alagu [EMAIL PROTECTED] wrote:
Hi,
I would like to use advantage of the Sqlalchemy Stored Procedures.
engine = create_engine('postgres://postgres:[EMAIL PROTECTED]:5432/
neithal', echo=True)
session =
scoped_session(sessionmaker(bind=eng,transaction=True,autoflush=False))
trans=session.begin()
sql = select([func.add_user_f(108,'kk','kk')])
result = session.execute(sql)
result.close()
session.flush()
session.commit()
Thanks
Madhu Alagu
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[sqlalchemy] Re: patch for mssql odbc
On Tue, Apr 8, 2008 at 7:02 PM, Rick Morrison [EMAIL PROTECTED] wrote: I'll reply here rather than on the ticket as I'm unable to stay logged into Trac from here (dual TCP/IP address problem). I see no objection as long as we can document it somewhere to say it will impact the AutoTranslate argument on the odbc connection... Florent. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: patch for mssql odbc
I'll reply here rather than on the ticket as I'm unable to stay logged into Trac from here (dual TCP/IP address problem). I have just posted a patch for the MSSQL_odbc dialect. The ticket number is #1005. The patch is certainly simple enough, but any objection if we call the key odbc_autotranslate instead of simply autotranslate? Thanks for the patch, Rick --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: has() and multiple tables
On Tue, Apr 8, 2008 at 1:00 PM, Jonathan Ellis [EMAIL PROTECTED] wrote: session.query(Action).filter(Action.task.has(Task.connection.has(Connection.caller==caller1))) Yep--that's what I'm doing now. It has the effect of creating another nested subselect, but I'm not too concerned about that as both are relatively cheap EXISTS queries. -- Tim Lesher [EMAIL PROTECTED] --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Merging Objects Issue
On Apr 8, 2008, at 12:50 PM, Alex Ezell wrote:
The setup_all() call seemed to solve the issue with the mapper. Now,
I'm getting an error like:
'ColumnProperty' object has no attribute 'key'
when I attempt the session.merge(). The column it seems to happen with
is defined as:
id = Field(Integer,
PassiveDefault(text(nextval(('history_seq'::text)::regclass))),
colname='history_id', primary_key=True)
a stack trace will help to debug this issue.
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[sqlalchemy] Re: Getting error while using MapperExtension
On Apr 8, 2008, at 6:56 AM, Sanjay wrote:
Hi,
In a project, I am using MapperExtension this way:
class TaskExtension(MapperExtension):
def populate_instance(self, mapper, selectcontext, row, instance,
**flags):
mapper.populate_instance(selectcontext, row, instance,
**flags)
instance.on_load() # does some custom initialization
It gives me the following exception:
TypeError: ('Task' object is unsubscriptable...
its a simple argument-passing error. would need to see a full stack
trace to see what argument is being mis-interpreted and by whom.
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[sqlalchemy] Re: Getting error while using MapperExtension
For your call to mapper.populate_instance, you have the arguments for 'row'
and 'instance' reversed.
On Tue, Apr 8, 2008 at 6:56 AM, Sanjay [EMAIL PROTECTED] wrote:
Hi,
In a project, I am using MapperExtension this way:
class TaskExtension(MapperExtension):
def populate_instance(self, mapper, selectcontext, row, instance,
**flags):
mapper.populate_instance(selectcontext, row, instance,
**flags)
instance.on_load() # does some custom initialization
It gives me the following exception:
TypeError: ('Task' object is unsubscriptable...
Needing help.
thanks
Sanjay
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[sqlalchemy] Re: Merging Objects Issue
On Apr 8, 1:20 pm, Michael Bayer [EMAIL PROTECTED] wrote:
On Apr 8, 2008, at 12:50 PM, Alex Ezell wrote:
The setup_all() call seemed to solve the issue with the mapper. Now,
I'm getting an error like:
'ColumnProperty' object has no attribute 'key'
when I attempt the session.merge(). The column it seems to happen with
is defined as:
id = Field(Integer,
PassiveDefault(text(nextval(('history_seq'::text)::regclass))),
colname='history_id', primary_key=True)
a stack trace will help to debug this issue.
Good point ;)
I've pasted it here: http://dpaste.com/43794/
Thanks for taking a look.
/alex
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[sqlalchemy] Re: patch for mssql odbc
r4479 has the new 'odbc_autotranslate' flag Currently documented only in the CHANGES file, more docs will follow later. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Merging Objects Issue
On Apr 8, 2008, at 3:02 PM, Alex Ezell wrote:
On Apr 8, 1:20 pm, Michael Bayer [EMAIL PROTECTED] wrote:
On Apr 8, 2008, at 12:50 PM, Alex Ezell wrote:
The setup_all() call seemed to solve the issue with the mapper. Now,
I'm getting an error like:
'ColumnProperty' object has no attribute 'key'
when I attempt the session.merge(). The column it seems to happen
with
is defined as:
id = Field(Integer,
PassiveDefault(text(nextval(('history_seq'::text)::regclass))),
colname='history_id', primary_key=True)
a stack trace will help to debug this issue.
Good point ;)
I've pasted it here: http://dpaste.com/43794/
Thanks for taking a look.
thats really weird. mappers still aren't compiled, or at least that
property isn't. try saying compile_mappers(). i think we need to
see how you're doing all this, though. your elixir/ORM everything
should be fully imported and setup before you do any pickle activity.
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[sqlalchemy] Re: Merging Objects Issue
Good point ;) I've pasted it here:http://dpaste.com/43794/ Thanks for taking a look. thats really weird. mappers still aren't compiled, or at least that property isn't. try saying compile_mappers(). i think we need to see how you're doing all this, though. your elixir/ORM everything should be fully imported and setup before you do any pickle activity. I'll try that with compile_mappers() and try to abstract out what seems to be issue so I can do a paste for all to see without all the other gibberish that I'm doing :) I did have to delete the paste above. There was a URL in there that didn't really need to be all over Google (though it's probably too late). Thanks for your patience. /alex --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: ORM as a view
jason kirtland [EMAIL PROTECTED] writes: A couple approaches come to mind: - map Obj to a select() with the restrictions baked in I adapted the example the manual: http://www.sqlalchemy.org/docs/04/mappers.html#advdatamapping_mapper_selects It works great! The only thing that wasn't explicit from the example was that the properties of the mapped objected has to use the columns of the select object instead of the tables ones: -_next_join = (po_details_table.c.status_code_next +_pod_select = select([po_details_table], + and_(po_details_table.c.line_type == J , + po_details_table.c.line_no 0) + ).alias(pod_select) + +_next_join = (_pod_select.c.status_code_next == order_rules_table.c.status_code) -_last_join = (po_details_table.c.status_code_last +_last_join = (_pod_select.c.status_code_last == order_rules_table.c.status_code) -mapper(PODetail, po_details_table, + +mapper(PODetail, _pod_select, properties=dict(status_rule_next=relation(OrderRule, primaryjoin=_next_join), status_rule_last=relation(OrderRule, It would be nice if the example could illustrate this subtlety. Otherwise, I love it. Thanks! -- Yannick Gingras --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] lazy loaders and None / NULL
Is there a reason that lazy loaders for a 1-many relationship with an underlying FK column value of NULL still try to load instances with a query when an access is made to the mapped attribute? You know it's going to be an empty collection, right? --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: has() and multiple tables
On 4/8/08, Tim Lesher [EMAIL PROTECTED] wrote: Yep--that's what I'm doing now. It has the effect of creating another nested subselect, but I'm not too concerned about that as both are relatively cheap EXISTS queries. I wouldn't be surprised if PG's optimizer can inline it anyway. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: lazy loaders and None / NULL
On Apr 8, 2008, at 6:56 PM, Rick Morrison wrote: Is there a reason that lazy loaders for a 1-many relationship with an underlying FK column value of NULL still try to load instances with a query when an access is made to the mapped attribute? You know it's going to be an empty collection, right? the lazy loader is not supposed to fire off unless the instance has an _instance_key on it (and therefore has a primary key).So theres a little bit of an assumption that the collection is keyed off the primary key of the parent instance (with 1-many the FK is on the remote table so I assume thats what you meant). I guess thats not the case with your test case, so lazy_clause() could be enhanced to return None if no binds get a value (theres some other mechanics regarding deferred loading of attributes in that function which LoadLazyAttribute could send in a flag to disable). --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Merging Objects Issue
any chance an actual Mapper is getting pickled and unpickled in that process ? the stack trace indicates a mapper in a state that it should never be in. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Sharing metadata between modules...
Hi everybody, I was hoping to ask for a bit of help... I've been trying various ways to share metadata between modules so that one module I import can use and improve upon the models I've created in a different module, and I can't seem to get it quite right... Files within the same module could always just import metadata from a single-shared location, but since they're different modules, I can't seem to find another solution than metaprogramming... If I'm outside of both of the modules, I can import one, and then monkeypatch it using the other, but I wasn't too happy about that. The other solution I imagined was having a function in one module return a bunch of class objects representing the models, but I can't figure out how to import those into the current module.. Has anyone else already come across this? Thanks, Douglas Mayle --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: PostgreSQL Schema
db.engine = engine
sm = sessionmaker(autoflush=True,
transactional=True,bind=db.engine)
db.Session =scoped_session(sm)
trans=db.Session.begin()
db.Session.execute('set search_path to neithal,public')
trans.commit()
db.Session.commit()
_f = select([func.login_f(xxx)])
rs = db.Session.execute(_f)
Now,It's working fine.
Thanks
Madhu Alagu
On Apr 8, 5:41 pm, Michael Bayer [EMAIL PROTECTED] wrote:
On Apr 8, 2008, at 10:33 AM, Madhu Alagu wrote:
Hi,
How to set schema in sqlalchemy ?.(Set search_path To neithal,public)
#neithal.login_f
#select([func.login_f(username,password,lang)])
try func.neithal.login_f(xxx)
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[sqlalchemy] Re: Getting error while using MapperExtension
For your call to mapper.populate_instance, you have the arguments for 'row' and 'instance' reversed. Yes! reversing it works perfectly. I had guessed the argument sequence from the MapperExtension.populate_instance, which happens to be reverse. thanks a lot! Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
