On Tue, Jun 12, 2018, 10:20 AM HP3 <henddher.pedr...@gmail.com> wrote:
> Hmmm > > I didn't use the @hybrid_property.expression for anything else so I ended > up not using it. > > However, I still use @hybrid_property ... wouldn't it be the same as > @property? > > (I thought they were "pretty much" the same) > They're quite different because the hybrid has behavior at the class level as well, that's the whole complexity of hybrids > > On Saturday, June 9, 2018 at 8:06:18 AM UTC-5, Mike Bayer wrote: >> >> That's fine but you should probably use a normal @property for that, >> unless you are still making use of a separate "expression" portion. >> >> On Fri, Jun 8, 2018, 8:04 PM HP3 <henddher...@gmail.com> wrote: >> >>> I ended up settling for this: >>> >>> @hybrid_property >>> >>> def ancestors(self): >>> >>> session = inspect(self).session >>> >>> cte = session.query(P2B) \ >>> >>> .filter(P2B.id == self.id) \ >>> >>> .cte(name='cte', recursive=True) >>> >>> cte = cte.union( >>> >>> session.query(P2B) >>> >>> .filter(P2B.id == cte.c.parent_id) >>> >>> ) >>> >>> return session.query(cte).all() >>> >>> And each time I call child.ancestors, the SQL CTE RECURSIVE is issued >>> (of course!?) >>> >>> Thanks again for all your help Mike! >>> >>> On Friday, June 8, 2018 at 6:39:05 PM UTC-5, HP3 wrote: >>>> >>>> BTW, the solution of `.params(child_id=child_id)` you provided worked >>>> perfectly - forgot to mentioned earlier. >>>> It issued the recursive CTE I wanted. >>>> >>>> I still need to ponder if I can simply live with a plain select().cte() >>>> within a vanilla method or @hybrid_property or @hybrid_method, all except >>>> @hybrid_property.expression as in the latter the "caller" would need to >>>> remember to bind `child_id` explicitly and forfeit the usage of `filter( >>>> ancs.c.id==child_id)` >>>> >>>> Thank you very much again Mike !!!! >>>> >>>> On Friday, June 8, 2018 at 6:06:54 PM UTC-5, Mike Bayer wrote: >>>>> >>>>> On Fri, Jun 8, 2018 at 6:59 PM, HP3 <henddher...@gmail.com> wrote: >>>>> > :( >>>>> > >>>>> > Basically, I was trying to prevent the SQL Select for each >>>>> child-to-parent >>>>> > loop-iteration when navigating the tree from leaf to root because I >>>>> figured >>>>> > I could use CTE recursive as @hybrid_property.expression. >>>>> > >>>>> > I was trying to take full advantage of @hybrid_property.expression >>>>> like the >>>>> > examples in >>>>> > >>>>> http://docs.sqlalchemy.org/en/latest/orm/extensions/hybrid.html#join-dependent-relationship-hybrid >>>>> > and >>>>> > >>>>> http://docs.sqlalchemy.org/en/latest/orm/extensions/hybrid.html#module-sqlalchemy.ext.hybrid >>>>> > The examples show that self/cls is magically chosen depending on the >>>>> > context. >>>>> > >>>>> > Seems like I will end up having *limited* functionality for my >>>>> > `@hybrid_property.expression` as I would have to pass the extra >>>>> param >>>>> > `cls_id` explicitly. >>>>> > >>>>> > I was hoping that >>>>> `dbsession.query(P2B.ancestors).filter(P2B.id==mychildid)` >>>>> > would automagically bind 'mychildid' to `cls.id` within the >>>>> > @ancestors.expression. >>>>> > Perhaps such is possible some other way? >>>>> >>>>> a hybrid is just a function to give you a component of SQL. if you >>>>> want to change the inside of it, then you need to send a parameter on >>>>> the inside or do a transformation of it. I guess you could run a >>>>> transform, which is what the lazy loader does, e.g. looks for where >>>>> something like "cls.id" is and then replaces it but this is very >>>>> specialized, it wouldn't look any nicer from the calling point of >>>>> view. >>>>> >>>>> >>>>> >>>>> >>>>> > >>>>> > Another catch is that by issuing the manual CTE, the session would >>>>> always >>>>> > issue the SQL and never returned previously loaded ancestors. >>>>> > >>>>> > root >>>>> > / \ >>>>> > c1 c2 >>>>> > >>>>> > c1.ancestors and c2.ancestors will each issue SQL recursive CTE ... >>>>> right? >>>>> > >>>>> > >>>>> > On Friday, June 8, 2018 at 5:33:08 PM UTC-5, Mike Bayer wrote: >>>>> >> >>>>> >> On Fri, Jun 8, 2018 at 5:14 PM, HP3 <henddher...@gmail.com> wrote: >>>>> >> > Thank you so much Mike >>>>> >> > >>>>> >> > >>>>> >> > I am trying to write @ancestors.expression to produce a SQL like >>>>> this: >>>>> >> > >>>>> >> > WITH RECURSIVE scte(id, parent_id) AS >>>>> >> > >>>>> >> > (SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>> >> > >>>>> >> > FROM p2bases >>>>> >> > >>>>> >> > WHERE p2bases.id = %(id_1)s --- This is the param I need at >>>>> runtime >>>>> >> > (cls.id) >>>>> >> > >>>>> >> > UNION SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>> >> > >>>>> >> > FROM p2bases, scte >>>>> >> > >>>>> >> > WHERE p2bases.id = scte.parent_id) >>>>> >> > >>>>> >> > SELECT scte.id >>>>> >> > >>>>> >> > FROM scte >>>>> >> >>>>> >> >>>>> >> you'd have to put the parameter inside the CTE then, here's one >>>>> way: >>>>> >> >>>>> >> @ancestors.expression >>>>> >> def ancestors(cls): >>>>> >> cte = select([P2B.id, P2B.parent_id]) \ >>>>> >> .where(P2B.id == bindparam("cls_id")) \ >>>>> >> .cte(name='cte', recursive=True) >>>>> >> cte = cte.union( >>>>> >> select([P2B.id, P2B.parent_id]) >>>>> >> .where(P2B.id == cte.c.parent_id) >>>>> >> ) >>>>> >> return cte >>>>> >> >>>>> >> >>>>> >> then you do: >>>>> >> >>>>> >> dbsession.query(P2B.ancestors).params(cls_id=child_id).all() >>>>> >> >>>>> >> >>>>> >> but note that you always need to provide params(cls_id=x) in that >>>>> case. >>>>> >> >>>>> >> >>>>> >> >>>>> >> > >>>>> >> > >>>>> >> > >>>>> >> > >>>>> >> > Here is the @hybrid_property.expression >>>>> >> > >>>>> >> > @ancestors.expression >>>>> >> > >>>>> >> > def ancestors(cls): >>>>> >> > >>>>> >> > cte = select([P2B.id, P2B.parent_id]) \ >>>>> >> > >>>>> >> > .where(P2B.id == cls.id) \ # <<<<<<< I cannot figure >>>>> out how >>>>> >> > make cls.id the param >>>>> >> > >>>>> >> > .cte(name='cte', recursive=True) >>>>> >> > >>>>> >> > cte = cte.union( >>>>> >> > >>>>> >> > select([P2B.id, P2B.parent_id]) >>>>> >> > >>>>> >> > .where(P2B.id == cte.c.parent_id) >>>>> >> > >>>>> >> > ) >>>>> >> > >>>>> >> > return cte >>>>> >> > >>>>> >> > >>>>> >> > I tried alias, aliased and bindparam in multiple ways >>>>> unsuccessfully. >>>>> >> > >>>>> >> > >>>>> >> > The SQL that is coming out doesn't set the first (cte anchor) >>>>> WHERE >>>>> >> > clause >>>>> >> > with the bound param id_1 (cls.id in the @ancestors.expression). >>>>> >> > Instead, is the column again? >>>>> >> > >>>>> >> > WITH RECURSIVE cte(id, parent_id) AS >>>>> >> > >>>>> >> > (SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>> >> > >>>>> >> > FROM p2bases >>>>> >> > >>>>> >> > WHERE p2bases.id = p2bases.id -- <<<< I can't figure out how to >>>>> make >>>>> >> > expr.left 'cls.id' from the @ancestors.expression >>>>> >> > >>>>> >> > UNION SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>> >> > >>>>> >> > FROM p2bases, cte >>>>> >> > >>>>> >> > WHERE p2bases.id = cte.parent_id) >>>>> >> > >>>>> >> > SELECT cte.id AS cte_id, cte.parent_id AS cte_parent_id >>>>> >> > >>>>> >> > FROM cte >>>>> >> > >>>>> >> > WHERE cte.id = %(id_1)s >>>>> >> > >>>>> >> > >>>>> >> > >>>>> >> > The correct SQL comes out when I do this: >>>>> >> > >>>>> >> > scte = select([P2B.id, P2B.parent_id]) \ >>>>> >> > >>>>> >> > .where(P2B.id == child_id) \ >>>>> >> > >>>>> >> > .cte(name='scte', recursive=True) >>>>> >> > >>>>> >> > scte = scte.union( >>>>> >> > >>>>> >> > select([P2B.id, P2B.parent_id]).where(P2B.id == >>>>> >> > scte.c.parent_id)) >>>>> >> > >>>>> >> > s = select([scte.c.id]) >>>>> >> > >>>>> >> > ancestors = dbsession.execute(s).fetchall() >>>>> >> > >>>>> >> > >>>>> >> > But I don't know how to integrate that into my >>>>> @ancestors.expression >>>>> >> > >>>>> >> > I want `child_id` to get the value of `cls.id` when the >>>>> @hybrid_property >>>>> >> > is >>>>> >> > called for the class. >>>>> >> > >>>>> >> > >>>>> >> > >>>>> >> > >>>>> >> > On Friday, June 8, 2018 at 1:48:55 PM UTC-5, Mike Bayer wrote: >>>>> >> >> >>>>> >> >> the example is huge can you point out which two queries you'd >>>>> like to >>>>> >> >> compare? >>>>> >> >> >>>>> >> >> this: >>>>> >> >> cte = dbsession.query(P2B.id, P2B.parent_id) \ >>>>> >> >> .filter(P2B.id == child_id) \ >>>>> >> >> .cte(name='cte', recursive=True) >>>>> >> >> cte = cte.union( >>>>> >> >> dbsession.query(P2B.id, P2B.parent_id).filter( >>>>> >> >> P2B.id == cte.c.parent_id)) >>>>> >> >> cteids = dbsession.query(cte.c.id) >>>>> >> >> ancestors = >>>>> >> >> dbsession.query(P2B).filter(P2B.id.in_(cteids)).all()[1:] >>>>> >> >> >>>>> >> >> >>>>> >> >> and this? >>>>> >> >> >>>>> >> >> ancestors = dbsession.query( >>>>> >> >> P2B.ancestors).filter(P2B.id == child_id).all() # >>>>> <<<< >>>>> >> >> child_id IS NEVER USED IN EXPRESSION >>>>> >> >> >>>>> >> >> >>>>> >> >> >>>>> >> >> it might surprise you to know I barely follow what these queries >>>>> are >>>>> >> >> returning for you, I just look very briefly to get the desired >>>>> syntax >>>>> >> >> right, so a simple "here's teh code hre's the SQL" is best >>>>> >> >> >>>>> >> >> >>>>> >> >> >>>>> >> >> On Fri, Jun 8, 2018 at 2:44 PM, HP3 <henddher...@gmail.com> >>>>> wrote: >>>>> >> >> > Ahhhh!!! Makes perfect sense! >>>>> >> >> > >>>>> >> >> > But there is something still amiss ... >>>>> >> >> > The last 2 assertions are triggering because the query is >>>>> returning a >>>>> >> >> > single >>>>> >> >> > ancestor (self) instead of the whole recursive list. >>>>> >> >> > >>>>> >> >> > See the plain CTE and the @hybrid_property.expression CTE: The >>>>> where >>>>> >> >> > clauses >>>>> >> >> > are still different :( >>>>> >> >> > (and hence the output) >>>>> >> >> > >>>>> >> >> > Are my @hybrid_property.expressions incorrectly declared? >>>>> >> >> > >>>>> >> >> > >>>>> >> >> > CTE ---------------------------------------- >>>>> >> >> > >>>>> >> >> > 2018-06-08 13:14:44,144 INFO sqlalchemy.engine.base.Engine >>>>> BEGIN >>>>> >> >> > (implicit) >>>>> >> >> > >>>>> >> >> > 2018-06-08 13:14:44,145 INFO sqlalchemy.engine.base.Engine >>>>> WITH >>>>> >> >> > RECURSIVE >>>>> >> >> > cte(id, parent_id) AS >>>>> >> >> > >>>>> >> >> > (SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>> >> >> > >>>>> >> >> > FROM p2bases >>>>> >> >> > >>>>> >> >> > WHERE p2bases.id = %(id_1)s UNION SELECT p2bases.id AS >>>>> p2bases_id, >>>>> >> >> > p2bases.parent_id AS p2bases_parent_id >>>>> >> >> > >>>>> >> >> > FROM p2bases, cte >>>>> >> >> > >>>>> >> >> > WHERE p2bases.id = cte.parent_id) >>>>> >> >> > >>>>> >> >> > SELECT p2bases.id AS p2bases_id, p2bases.uuid AS >>>>> p2bases_uuid, >>>>> >> >> > p2bases.classname AS p2bases_classname, p2bases.position AS >>>>> >> >> > p2bases_position, p2bases.extras AS p2bases_extras, >>>>> p2bases.val AS >>>>> >> >> > p2bases_val, p2bases.time AS p2bases_time, p2bases.parent_id >>>>> AS >>>>> >> >> > p2bases_parent_id >>>>> >> >> > >>>>> >> >> > FROM p2bases >>>>> >> >> > >>>>> >> >> > WHERE p2bases.id IN (SELECT cte.id AS cte_id >>>>> >> >> > >>>>> >> >> > FROM cte) >>>>> >> >> > >>>>> >> >> > 2018-06-08 13:14:44,146 INFO sqlalchemy.engine.base.Engine >>>>> {'id_1': >>>>> >> >> > 20} >>>>> >> >> > >>>>> >> >> > CTE ANCESTORS <__main__.P2Pg object at 0x10bf94be0> >>>>> >> >> > >>>>> >> >> > CTE ANCESTORS <__main__.P2An object at 0x10bf9a160> >>>>> >> >> > >>>>> >> >> > CTE ANCESTORS <__main__.P2KVP object at 0x10bf9a6a0> >>>>> >> >> > >>>>> >> >> > >>>>> >> >> > >>>>> >> >> > @hybrid_property.expression ANCESTORS CLS >>>>> >> >> > ---------------------------------------- >>>>> >> >> > >>>>> >> >> > 2018-06-08 13:14:44,181 INFO sqlalchemy.engine.base.Engine >>>>> WITH >>>>> >> >> > RECURSIVE >>>>> >> >> > cte(id, parent_id) AS >>>>> >> >> > >>>>> >> >> > (SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>> >> >> > >>>>> >> >> > FROM p2bases >>>>> >> >> > >>>>> >> >> > WHERE p2bases.id = p2bases.id UNION SELECT p2bases.id AS id, >>>>> >> >> > p2bases.parent_id AS parent_id >>>>> >> >> > >>>>> >> >> > FROM p2bases, cte >>>>> >> >> > >>>>> >> >> > WHERE p2bases.id = cte.parent_id) >>>>> >> >> > >>>>> >> >> > SELECT cte.id AS cte_id, cte.parent_id AS cte_parent_id >>>>> >> >> > >>>>> >> >> > FROM cte >>>>> >> >> > >>>>> >> >> > WHERE cte.id = %(id_1)s >>>>> >> >> > >>>>> >> >> > 2018-06-08 13:14:44,182 INFO sqlalchemy.engine.base.Engine >>>>> {'id_1': >>>>> >> >> > 20} >>>>> >> >> > >>>>> >> >> > @hybrid_property.expression ANCESTORS CLS (20, 5) >>>>> >> >> > >>>>> >> >> > >>>>> >> >> > >>>>> >> >> > >>>>> >> >> > On Friday, June 8, 2018 at 12:27:28 PM UTC-5, Mike Bayer >>>>> wrote: >>>>> >> >> >> >>>>> >> >> >> On Fri, Jun 8, 2018 at 12:16 PM, HP3 <henddher...@gmail.com> >>>>> wrote: >>>>> >> >> >> > Attached the whole file >>>>> >> >> >> >>>>> >> >> >> OK, removing all the "zope" stuff as well as all the other >>>>> queries >>>>> >> >> >> that aren't noted as failing, I am only looking at this >>>>> query: >>>>> >> >> >> >>>>> >> >> >> ancestors = dbsession.query(P2B.ancestors).filter(P2B.id >>>>> == >>>>> >> >> >> child_id).all() # <<<< child_id IS NEVER USED IN EXPRESSION >>>>> >> >> >> >>>>> >> >> >> the problem is that you are re-introducing P2B a second time, >>>>> rather >>>>> >> >> >> than referring to the columns that your CTE returns, it >>>>> should be: >>>>> >> >> >> >>>>> >> >> >> ansc = P2B.ancestors >>>>> >> >> >> ancestors = dbsession.query(ansc).filter(ansc.c.id == >>>>> >> >> >> child_id).all() >>>>> >> >> >> >>>>> >> >> >> this produces SQL that obeys the same form I see at >>>>> >> >> >> >>>>> https://www.postgresql.org/docs/current/static/queries-with.html. >>>>> >> >> >> >>>>> >> >> >> Since P2B.ancestors produces a new selectable each time, you >>>>> need to >>>>> >> >> >> assign it to a variable in order to refer to its set of >>>>> columns >>>>> >> >> >> without re-introducing it. >>>>> >> >> >> >>>>> >> >> >> >>>>> >> >> >> >>>>> >> >> >> >>>>> >> >> >> > >>>>> >> >> >> > >>>>> >> >> >> > On Thursday, June 7, 2018 at 7:01:21 PM UTC-5, HP3 wrote: >>>>> >> >> >> >> >>>>> >> >> >> >> Hello >>>>> >> >> >> >> >>>>> >> >> >> >> >>>>> >> >> >> >> Having difficulty with CTE and @hybrid_property.expression >>>>> on a >>>>> >> >> >> >> adjacency >>>>> >> >> >> >> list model. >>>>> >> >> >> >> >>>>> >> >> >> >> >>>>> >> >> >> >> class P2B(Base): >>>>> >> >> >> >> __tablename__ = 'p2bases' >>>>> >> >> >> >> id = Column(Integer, primary_key=True) >>>>> >> >> >> >> classname = Column(String) >>>>> >> >> >> >> parent_id = Column( >>>>> >> >> >> >> Integer, >>>>> >> >> >> >> ForeignKey('p2bases.id', ondelete='CASCADE'), >>>>> >> >> >> >> index=True >>>>> >> >> >> >> ) >>>>> >> >> >> >> >>>>> >> >> >> >> parent = relationship( >>>>> >> >> >> >> 'P2B', >>>>> >> >> >> >> primaryjoin='P2B.parent_id == P2B.id', >>>>> >> >> >> >> foreign_keys='P2B.id', >>>>> >> >> >> >> uselist=False >>>>> >> >> >> >> ) >>>>> >> >> >> >> >>>>> >> >> >> >> __mapper_args__ = { >>>>> >> >> >> >> 'polymorphic_identity': 'P2B', >>>>> >> >> >> >> 'polymorphic_on': classname >>>>> >> >> >> >> } >>>>> >> >> >> >> >>>>> >> >> >> >> @hybrid_property >>>>> >> >> >> >> def ancestors(self): >>>>> >> >> >> >> _ancestors = [] >>>>> >> >> >> >> parent = self.parent >>>>> >> >> >> >> while parent is not None: >>>>> >> >> >> >> _ancestors.append(parent) >>>>> >> >> >> >> parent = parent.parent >>>>> >> >> >> >> return _ancestors >>>>> >> >> >> >> >>>>> >> >> >> >> @ancestors.expression >>>>> >> >> >> >> def ancestors(cls): >>>>> >> >> >> >> cte = select([P2B.id, P2B.parent_id]) \ >>>>> >> >> >> >> .where(P2B.id == cls.id) \ # <<<<<< Based on >>>>> >> >> >> >> Example1 >>>>> >> >> >> >> .cte(name='cte', recursive=True) >>>>> >> >> >> >> >>>>> >> >> >> >> cte = cte.union( >>>>> >> >> >> >> select([P2B.id, P2B.parent_id]) >>>>> >> >> >> >> .where(P2B.id == cte.c.parent_id) >>>>> >> >> >> >> >>>>> >> >> >> >> ) >>>>> >> >> >> >> return cte >>>>> >> >> >> >> >>>>> >> >> >> >> >>>>> >> >> >> >> >>>>> >> >> >> >> >>>>> >> >> >> >> >>>>> >> >> >> >> >>>>> >> >> >> >> The issue I am facing is that the SQL statement for >>>>> ancestors >>>>> >> >> >> >> expression >>>>> >> >> >> >> becomes this >>>>> >> >> >> >> >>>>> >> >> >> >> >>>>> >> >> >> >> >>>>> >> >> >> >> >>>>> >> >> >> >> WITH RECURSIVE cte(id, parent_id) AS >>>>> >> >> >> >> >>>>> >> >> >> >> (SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>> >> >> >> >> >>>>> >> >> >> >> FROM p2bases >>>>> >> >> >> >> >>>>> >> >> >> >> WHERE p2bases.id = <a href="http://p2bases.id"; >>>>> target="_blank" rel="nofollow" onmousedown="this.href=' >>>>> http://www.google.com/url?q\x3dhttp%3A%2F%2Fp2bases.id\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNFXb6853cCgweqpw68fbajiKFHNJg';return >>>>> <http://www.google.com/url?q%5Cx3dhttp%3A%2F%2Fp2bases.id%5Cx26sa%5Cx3dD%5Cx26sntz%5Cx3d1%5Cx26usg%5Cx3dAFQjCNFXb6853cCgweqpw68fbajiKFHNJg';return> >>>>> true;" onclick="this.href=' >>>>> http://www.google.com/url?q\x3dhttp%3A%2F%2Fp2bases.id\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQj >>>>> <http://www.google.com/url?q%5Cx3dhttp%3A%2F%2Fp2bases.id%5Cx26sa%5Cx3dD%5Cx26sntz%5Cx3d1%5Cx26usg%5Cx3dAFQj> >>>> >>>> -- >>> SQLAlchemy - >>> The Python SQL Toolkit and Object Relational Mapper >>> >>> http://www.sqlalchemy.org/ >>> >>> To post example code, please provide an MCVE: Minimal, Complete, and >>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full >>> description. >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "sqlalchemy" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to sqlalchemy+...@googlegroups.com. >>> To post to this group, send email to sqlal...@googlegroups.com. >>> Visit this group at https://groups.google.com/group/sqlalchemy. >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- > SQLAlchemy - > The Python SQL Toolkit and Object Relational Mapper > > http://www.sqlalchemy.org/ > > To post example code, please provide an MCVE: Minimal, Complete, and > Verifiable Example. 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