Jim, Thank you very much for your help,
This is a perfect solution for me. It just took me time to figure out what was going on. I don't think that this can be classified as a bug in web2py. It's just very confusing for anybody who encounters this situation. However, if I am the only one who has encountered it for the past 10 years, we can live with it :) Thank you! On Thu, Oct 8, 2020, 10:58 AM Jim S <ato.st...@gmail.com> wrote: > Vlad > > The behavior is exactly as you said it is. > > I don't know if I'd go as far as saying this is a problem with web2py. I > got around it by using this instead of the try/except in GetCartsGridLink > > id = row.cart.id if 'cart' in row else row.id > > I know it isn't ideal and isn't what you were looking for, but as you > found, it isn't that hard to get around. I'm just surprised that I haven't > run into this over the years I've been working with web2py because I do > similar linking in my apps all the time. > > Sorry I couldn't be of more help. > > Anyone else have any thoughts on this? > > -Jim > > > On Thursday, October 8, 2020 at 8:45:41 AM UTC-5, Vlad wrote: >> >> Just realized that there is another field, virtual one, referenced in the >> code. In case the problem doesn't reproduce without it, here is the >> definition (but I don't think that this would be necessary): >> >> db.cart.count = Field.Virtual(lambda row: db(db.cart_content.cart== >> row.cart.id >> ).select(db.cart_content.quantity.count()).first()[db.cart_content.quantity.count()]) >> >> And here is the model (and data attached): >> >> db.define_table('cart_content', >> Field('cart','reference cart'), >> Field('product','reference product'), >> Field('formula','reference formula'), >> Field('description','string',default=None), >> Field('flavor','reference flavor'), >> Field('quantity','integer',requires=[IS_NOT_EMPTY()],default=1), >> Field('price','integer',represent=lambda x, row: '$' + str(x/100)), >> Field('imported','boolean'), >> auth.signature) >> >> >> >> On Thursday, October 8, 2020 at 9:37:34 AM UTC-4 Vlad wrote: >> >>> Sure, the sample data attached (are these 2 tables enough?), and the >>> models are as follows: >>> >>> db.define_table('cart', >>> Field('description','string',default='My Cart (%s)' % >>> str((datetime.now().strftime("%m/%d/%Y %I:%M%p")))), >>> auth.signature) >>> >>> db.define_table('cart_ownership', >>> Field('description', 'string'), >>> Field('boss','reference auth_user'), >>> Field('cart', 'reference cart'), >>> Field('status', 'string', requires=IS_IN_SET(['current','onhold'])), >>> auth.signature) >>> >>> >>> On Thursday, October 8, 2020 at 9:18:53 AM UTC-4 Jim S wrote: >>> >>>> any chance you have a model and a small sample-set of data you could >>>> share that cause the inconsistencies to be shown? Just 3 records or so in >>>> each table that can show the inconsistency? >>>> >>>> >>>> On Thursday, October 8, 2020 at 7:38:48 AM UTC-5, Vlad wrote: >>>> >>>>> Yes, there is always a corresponding record in the second table >>>>> (doesn't have to be, but I do clean up ownerless carts, so when I am >>>>> testing things, the corresponding record is always there). >>>>> >>>>> Here is the complete creation of the grid (where GetCartsGridLink is >>>>> the function that now has try/except clause to flip between row.id >>>>> and row.cart.id): >>>>> >>>>> def show_carts(): >>>>>> query = db.cart >>>>>> headers = {'cart.id':'ID', 'cart.description':'Name', >>>>>> 'cart_ownership.boss':'Owner', 'cart_ownership.status':'Status', >>>>>> 'cart.count':'Items'} >>>>>> fields = [db.cart.id, db.cart.description, >>>>>> db.cart_ownership.boss, db.cart_ownership.status, db.cart.count] >>>>>> links = [dict(header='View', body=GetCartsGridLink)] >>>>>> >>>>>> grid = SQLFORM.grid(query, >>>>>> editable=True, >>>>>> details=True, >>>>>> create=True, >>>>>> links=links, >>>>>> fields=fields, >>>>>> headers=headers, >>>>>> orderby=[~db.cart.created_on], >>>>>> left = [db.cart_ownership.on(db.cart.id >>>>>> ==db.cart_ownership.cart)], >>>>>> formname='carts_grid', >>>>>> field_id=db.cart.id, >>>>>> ) >>>>>> >>>>>> return grid >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> On Wed, Oct 7, 2020 at 11:12 PM Jim Steil <ato....@gmail.com> wrote: >>>>> >>>> I will take a look tomorrow to see if I can code something up to >>>>>> reproduce the error. >>>>>> >>>>>> Which tackle are you setting as the 'primary' table, by that I mean >>>>>> what field are you specifying in the field_id parameter? And, is there >>>>>> ALWAYS a matching record in the secondary table? >>>>>> >>>>>> Oh, just thought of another thing. How about specifying db.cart.id >>>>>> in fields=[], and the also specifying it in hidden_fields=[]? >>>>>> >>>>>> Jim >>>>>> >>>>>> >>>>>> >>>>>> On Wed, Oct 7, 2020, 9:50 PM Eliezer (Vlad) Tseytkin < >>>>>> westga...@gmail.com> wrote: >>>>>> >>>>> Jom, you said " I'm having trouble understanding why you need the >>>>>>> try/except" - this is exactly the trouble I'm having too :) >>>>>>> >>>>>>> I do use the left join. So I should simply specify the table name - >>>>>>> correct? >>>>>>> >>>>>>> Well, if I do - then the grid itself works fine, but once I click >>>>>>> "view" or "edit" - it crashes. To fix that crash, I must specify >>>>>>> try/except clause in the function used by the "links". WIthout that >>>>>>> try/except the actions of view and edit don' work! >>>>>>> >>>>>>> That's exactly what I am saying - with the left join, the grid >>>>>>> expects the table name, but the view/edit actions of this grid expect no >>>>>>> table name and in fact crash when the table name is there. >>>>>>> >>>>>>> On Wed, Oct 7, 2020 at 10:38 PM Jim S <ato....@gmail.com> wrote: >>>>>>> >>>>>> I'm having trouble understanding why you need the try/except. To me >>>>>>>> it seems like "if you specify a left" -> you need to use the table >>>>>>>> name. >>>>>>>> "if you don't specify a left" -> omit the table name >>>>>>>> >>>>>>>> Do you have an occasion where sometimes different rows in the same >>>>>>>> grid require you to specify the field differently? >>>>>>>> >>>>>>>> -Jim >>>>>>>> >>>>>>>> On Wednesday, October 7, 2020 at 9:30:28 PM UTC-5, Vlad wrote: >>>>>>>>> >>>>>>>>> But shouldn't it be the same for the grid and for the record of >>>>>>>>> the grid? The difference confuses me - having to specify the table >>>>>>>>> should >>>>>>>>> be consistent when I use the grid for all the transactions of the >>>>>>>>> grid, including view/edit etc.. >>>>>>>>> >>>>>>>>> In other words, having to specify the table is perfectly fine - >>>>>>>>> but it should be consistent and I should as well specify the table >>>>>>>>> for the >>>>>>>>> view/edit action of the grid record. Different structures for the >>>>>>>>> gird and >>>>>>>>> fo the record of the grid seems inconsistent to me.It took me time to >>>>>>>>> figure this out - now that I know how this works, I simply have the >>>>>>>>> try/except to solve it - this makes practical sense, as it solves the >>>>>>>>> problem, but it makes no logical sense. Do you know what I mean? >>>>>>>>> Anybody >>>>>>>>> who encounters such a situation will presumably be messed up and have >>>>>>>>> to >>>>>>>>> spend time figuring out what's going on. >>>>>>>>> >>>>>>>>> On Wed, Oct 7, 2020 at 10:22 PM Jim Steil <ato....@gmail.com> >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> I think that is a result of having a left join specified. With >>>>>>>>>> the left join you now have to specify which table the field is in as >>>>>>>>>> well. >>>>>>>>>> >>>>>>>>>> Or, am I missing something? >>>>>>>>>> >>>>>>>>>> -Jim >>>>>>>>>> >>>>>>>>>> On Wed, Oct 7, 2020 at 9:13 PM Eliezer (Vlad) Tseytkin < >>>>>>>>>> westga...@gmail.com> wrote: >>>>>>>>>> >>>>>>>>>>> Jim, >>>>>>>>>>> >>>>>>>>>>> Thank you for the suggestions. >>>>>>>>>>> >>>>>>>>>>> I do specify field_id (it wasn't there in the simplified code, >>>>>>>>>>> but the complete code does have it). >>>>>>>>>>> >>>>>>>>>>> When I use a function, instead of the lambda, I indeed can have >>>>>>>>>>> a solution, but at the same time it emphasizes that something is >>>>>>>>>>> wrong: >>>>>>>>>>> >>>>>>>>>>> The links are now presented as such: >>>>>>>>>>> >>>>>>>>>>> links = [dict(header='View', body=GetCartsGridLink)] >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> And the GetCarrsGridLink function as follows: >>>>>>>>>>> >>>>>>>>>>> def GetCartsGridLink(row): >>>>>>>>>>>> >>>>>>>>>>>> id = None >>>>>>>>>>>> >>>>>>>>>>>> try: >>>>>>>>>>>> id = row.cart.id # this works for the grid itself >>>>>>>>>>>> except: >>>>>>>>>>>> id = row.id # this works for the view/edit of a record >>>>>>>>>>>> of the grid >>>>>>>>>>>> >>>>>>>>>>>> result = A(id, >>>>>>>>>>>> _href=URL('manage', 'view_cart', args=id, >>>>>>>>>>>> user_signature=True), >>>>>>>>>>>> _target='blank') >>>>>>>>>>>> >>>>>>>>>>>> return result >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> It does solve the problem, because try/except takes care of it, >>>>>>>>>>> setting up the id based on the context. >>>>>>>>>>> >>>>>>>>>>> I feel there is something wrong with the very necessity of >>>>>>>>>>> having to use try/except here. Why would it use different >>>>>>>>>>> structures in the >>>>>>>>>>> grid itself vs. view/edit a row of the grid??? >>>>>>>>>>> >>>>>>>>>>> The problem has been solved, but the mystery remains. I am still >>>>>>>>>>> missing something about it... >>>>>>>>>>> >>>>>>>>>>> On Wed, Oct 7, 2020 at 4:48 PM Jim S <ato....@gmail.com> wrote: >>>>>>>>>>> >>>>>>>>>>>> I have a couple of ideas, but none are tested >>>>>>>>>>>> >>>>>>>>>>>> First, can you try adding the field_id parameter to your >>>>>>>>>>>> SQLFORM.grid() call? I believe that tells this grid which is your >>>>>>>>>>>> 'primary' table. >>>>>>>>>>>> >>>>>>>>>>>> Secondly (this is the way I typically handle it) - instead of >>>>>>>>>>>> coding everything in a lambda, call a function to build your >>>>>>>>>>>> buttons and >>>>>>>>>>>> just pass it the id of the row. Then, in your function you can >>>>>>>>>>>> retrieve >>>>>>>>>>>> the entire row and get all the data you need even if it isn't >>>>>>>>>>>> included in >>>>>>>>>>>> the grid fields. >>>>>>>>>>>> >>>>>>>>>>>> Not sure that completely addresses your concern, but if you run >>>>>>>>>>>> through those ideas it might help you onto a solution. >>>>>>>>>>>> >>>>>>>>>>>> -Jim >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> On Wednesday, October 7, 2020 at 1:44:41 PM UTC-5, Vlad wrote: >>>>>>>>>>>>> >>>>>>>>>>>>> Seems to me this is an inconsistency in the way how grid >>>>>>>>>>>>> operates (which breaks it, as I show below, but, of course, most >>>>>>>>>>>>> probably I >>>>>>>>>>>>> am just missing something.) >>>>>>>>>>>>> >>>>>>>>>>>>> The following code crashes: >>>>>>>>>>>>> >>>>>>>>>>>>> query = db.cart >>>>>>>>>>>>> fields = [db.cart.id] >>>>>>>>>>>>> links = [dict(header='View', body=lambda row: str(*row.cart.id >>>>>>>>>>>>> <http://row.cart.id>*))] >>>>>>>>>>>>> grid = SQLFORM.grid(query, editable=True, details=True, >>>>>>>>>>>>> links=links, fields=fields) >>>>>>>>>>>>> >>>>>>>>>>>>> This is because row.cart is undefined in the links. Instead, >>>>>>>>>>>>> the links should be made as such: >>>>>>>>>>>>> >>>>>>>>>>>>> links = [dict(header='View', body=lambda row: str(*row.id >>>>>>>>>>>>> <http://row.id>*))] >>>>>>>>>>>>> >>>>>>>>>>>>> Now this works. >>>>>>>>>>>>> >>>>>>>>>>>>> However, when I add more fields in the code, like this: >>>>>>>>>>>>> >>>>>>>>>>>>> fields = [db.cart.id, db.cart.description, >>>>>>>>>>>>> db.cart_ownership.boss, db.cart_ownership.status, db.cart.count] >>>>>>>>>>>>> >>>>>>>>>>>>> Now in the links I can't use "row.id". It must be "row.cart.id >>>>>>>>>>>>> " >>>>>>>>>>>>> >>>>>>>>>>>>> This by itself would be fine, I could just use *row.id >>>>>>>>>>>>> <http://row.id>* or *row.card.id <http://row.card.id>* >>>>>>>>>>>>> accordingly, depending on the fields used (though I would like to >>>>>>>>>>>>> control >>>>>>>>>>>>> this structure), but I am having the following problem further on: >>>>>>>>>>>>> >>>>>>>>>>>>> The grid described by the code >>>>>>>>>>>>> >>>>>>>>>>>>> query = db.cart >>>>>>>>>>>>> fields = [db.cart.id, db.cart.description, >>>>>>>>>>>>> db.cart_ownership.boss, db.cart_ownership.status, db.cart.count] >>>>>>>>>>>>> links = [dict(header='View', body=lambda row: str( >>>>>>>>>>>>> row.cart.id))] >>>>>>>>>>>>> grid = SQLFORM.grid(query, editable=True, details=True, >>>>>>>>>>>>> links=links, fields=fields) >>>>>>>>>>>>> >>>>>>>>>>>>> crashes when I try to view or edit a row of the grid. This is >>>>>>>>>>>>> because the links takes row.cart.id in the grid itself, but >>>>>>>>>>>>> expects row.id in edit- or view- actions (i.e. when editing >>>>>>>>>>>>> or viewing a row). When viewing or editing a row, row.cart is >>>>>>>>>>>>> undefined in >>>>>>>>>>>>> the links, so row.cart.id crashes it (when "view" or "edit" >>>>>>>>>>>>> buttons are clicked), while in the grid itself row.cart.id >>>>>>>>>>>>> works just fine (and row.id would not work). >>>>>>>>>>>>> >>>>>>>>>>>>> What am I missing here? How do I control how this field should >>>>>>>>>>>>> be expected in the links in the grid vs. in the view/edit a row >>>>>>>>>>>>> of the >>>>>>>>>>>>> grid? >>>>>>>>>>>>> >>>>>>>>>>>>> Here is still simplified but more complete code, in case I >>>>>>>>>>>>> missed something important in a "shortcut" code above: >>>>>>>>>>>>> >>>>>>>>>>>>> query = db.cart >>>>>>>>>>>>> fields = [db.cart.id, db.cart.description, >>>>>>>>>>>>> db.cart_ownership.boss, db.cart_ownership.status, db.cart.count] >>>>>>>>>>>>> links = [dict(header='View', body=lambda row: str( >>>>>>>>>>>>> row.cart.id))] >>>>>>>>>>>>> grid = SQLFORM.grid(query, >>>>>>>>>>>>> editable=True, >>>>>>>>>>>>> details=True, >>>>>>>>>>>>> links=links, >>>>>>>>>>>>> fields=fields, >>>>>>>>>>>>> left = [db.cart_ownership.on( >>>>>>>>>>>>> db.cart.id==db.cart_ownership.cart)], >>>>>>>>>>>>> field_id=db.cart.id, >>>>>>>>>>>>> ) >>>>>>>>>>>>> >>>>>>>>>>>>> -- >>>>>>>>>>>> Resources: >>>>>>>>>>>> - http://web2py.com >>>>>>>>>>>> - http://web2py.com/book (Documentation) >>>>>>>>>>>> - http://github.com/web2py/web2py (Source code) >>>>>>>>>>>> - https://code.google.com/p/web2py/issues/list (Report Issues) >>>>>>>>>>>> --- >>>>>>>>>>>> You received this message because you are subscribed to a topic >>>>>>>>>>>> in the Google Groups "web2py-users" group. >>>>>>>>>>>> To unsubscribe from this topic, visit >>>>>>>>>>>> https://groups.google.com/d/topic/web2py/UGhYBMwmXec/unsubscribe >>>>>>>>>>>> . >>>>>>>>>>>> To unsubscribe from this group and all its topics, send an >>>>>>>>>>>> email to web...@googlegroups.com. >>>>>>>>>>>> To view this discussion on the web visit >>>>>>>>>>>> https://groups.google.com/d/msgid/web2py/257aa85d-41f2-4b2e-a59a-bd1980c83efco%40googlegroups.com >>>>>>>>>>>> <https://groups.google.com/d/msgid/web2py/257aa85d-41f2-4b2e-a59a-bd1980c83efco%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>>>>>> . >>>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> Resources: >>>>>>>>>>> - http://web2py.com >>>>>>>>>>> - http://web2py.com/book (Documentation) >>>>>>>>>>> - 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