Ah, that might make sense actually. Because you technically don't have PolicyNumber mapped as a property, it's part of your composite key. Try something like this: Map(x=> PolicyNumberForNH, "PolicyNumber").Access.None();
Then change your property-ref to PolicyNumberForNH and see if NHibernate gets the clue then. I believe it actually needs a <property> to map a property-ref to, and not just a POCO property. On Thu, Jan 21, 2010 at 2:26 PM, Corey Coogan <[email protected]> wrote: > I spoke too soon. My claim that it worked was a case of mistaken > identity on a test that was being run but recently changed. > > Here's what this syntax is producing in an HBM. > > - <bag cascade="save-update" name="CreditCards" mutable="true"> > - <key property-ref="PolicyNumber"> > <column name="`PolNbr`" /> > </key> > <one-to-many class="Aah.Policy.InfoLayer.CrdtCardAcctRecord, > NHibernate.Spike.Data, Version=1.0.0.0, Culture=neutral, > PublicKeyToken=null" /> > </bag> > > I don't think that is right? I get an error during configuration from > NH that it can't find property PolicyNumber on my Policy object > (Parent class to CreditCards). That message is very misleading and > led to hours of chasing the wrong stuff. > > On Jan 20, 11:41 am, Hudson Akridge <[email protected]> wrote: > > Awesome, glad to be of assistance :) > > > > On Wed, Jan 20, 2010 at 11:40 AM, Corey Coogan <[email protected] > >wrote: > > > > > This worked like a charm and is exactly what I needed. > > > > > Thanks again! > > > > > On Jan 20, 9:34 am, Hudson Akridge <[email protected]> wrote: > > > > Understood. Ok, well, let's see if this works: > > > > HasMany(x=> > > > > > x.CreditCards).AsBag().KeyColumn("PolNbr").PropertyRef("PolicyNumber"); > > > > > > The PropertyRef should allow you to map to a non-key column in the > parent > > > > table. On the References() side it allows you to map to a non key > > > property > > > > in the related table. PropertyRef is for mapping lagacy data > > > specifically. > > > > > > If that doesn't work, do a quick ExportTo() in your config and paste > the > > > > hbm.xml mappings if you could, so I can make sure FNH is writing the > > > correct > > > > XML. > > > > > > You're fortunate that you're going from Composite to a single id, and > not > > > > the other way around. NHibernate doesn't support Hibernate's > <properties> > > > > tag yet, which means you can only map from one column to another > > > (hibernate > > > > allows you to do many columns to many columns in a property-ref) > > > > > > On Tue, Jan 19, 2010 at 8:59 PM, Corey Coogan <[email protected] > > > > > wrote: > > > > > Thanks again Hudson. I'm totally with you on the DB stuff and have > > > > > read quite a bit on the relationships. Unfortunately, most the > tables > > > > > truly need a PolicyNumber and PolicyDate as the composite key. > That's > > > > > because everytime a policy is renewed or changed in any way, a new > > > > > "portfolio" gets created which is a whole mess of tables with those > 2 > > > > > columns used to identify them. On the other hand, something like > > > > > CreditCard, is tied to a policy regardless of it's portfolio, so in > > > > > this case it is related to a PolicyNumber only. > > > > > > > I realized that the keys typically match up as a traditional > foreign > > > > > key constraint, but that's not the way these two tables are > related, > > > > > which is why I'm posting this question. These are tied together > today > > > > > with a hand-rolled data access layer. The user specifies a > > > > > policynumber and an as of date and the following queries are > executed > > > > > on a single open connection: > > > > > > > - Get the max(policydate) <= asOfDate > > > > > - Ge the Policy record for the PolicyNumber/PolicyDate > > > > > - Get credit cards for the PolicyNumber > > > > > > > I'm OK with specifiying a hand-written sql statement if necessary. > > > > > Maybe I need to handle these cases where there is no real FK in the > > > > > database by populating with an NH query after the initial > retrieval. > > > > > I'm just looking for the best way to map this stuff despite the > ugly > > > > > nature of what I'm working with. So I although I appreciate the > > > > > advice regarding DB design, but this is truly out of my hands. > > > > > > > Thanks, > > > > > Corey > > > > > > > On Jan 19, 3:44 pm, Hudson Akridge <[email protected]> > wrote: > > > > > > By the HasMany declaration. This is a one-to-many mapping in NH > > > lingo, > > > > > and > > > > > > I'd recommend reading up on > > > > > > that< > > > > > > http://ayende.com/Blog/archive/2009/04/13/nhibernate-mapping-ltsetgt... > > > .>. > > > > > > NHibernate is smart enough to know what your ParentId column is > on > > > Policy > > > > > > when going to the child table (CreditCards), it only needs to be > told > > > > > what > > > > > > column matches the ParentId in the child (CreditCards) table. In > your > > > > > case, > > > > > > it's PolNbr. > > > > > > > > I'd recommend against using composite keys in your mapping. You > don't > > > > > have > > > > > > to mirror how the database has declared things. In that case, if > > > > > > PolicyNumber is truly your ID, which it seems like you can do > since > > > > > things > > > > > > that relate to your Policies only contain a PolicyId back to > their > > > > > parent, > > > > > > then that's the only column that needs to be specified as your > Id. > > > > > > > > Composite Keys are for when there's no other option in my > opinion, > > > and if > > > > > > you declare composite keys, any children tables must also have > the > > > > > parents > > > > > > composite key columns contained within them to make for a valid > > > database > > > > > > relationship. Since the CreditCards table appears to only have > the > > > > > > PolicyNumber (PolNbr) then you, by database semantics, should be > able > > > to > > > > > > just treat a Policy as unique in the business domain by nothing > more > > > than > > > > > a > > > > > > PolicyNumber. If that wasn't a case, a CreditCard could belong to > > > > > multiple > > > > > > Policies, and in that case, the DBA has made an error and really > > > needs a > > > > > > join table between Policies and CreditCards. > > > > > > > > On Tue, Jan 19, 2010 at 3:18 PM, Corey Coogan < > [email protected] > > > > > > > wrote: > > > > > > > Wait, I just realized that I may still be confused. Your > example > > > is > > > > > > > assigning Id(x =>, but this is a composite key. How will FNH > know > > > > > > > that PolicyNumber=PolNbr? > > > > > > > > > On Jan 19, 2:37 pm, Hudson Akridge <[email protected]> > > > wrote: > > > > > > > > I'm guessing that PolicyNumber/PolicyDate in Policy are > mapped as > > > a > > > > > > > > composite key? > > > > > > > > > > Is there any reason for this other than that's what the > database > > > has > > > > > > > mapped > > > > > > > > it as? Is PolicyNumber a valid entity Identifier as far as > the > > > domain > > > > > > > model > > > > > > > > is concerned? > > > > > > > > > > If so, then you'd just map PolicyNumber with an > > > > > > > > Id(x=> x.PolicyNumber).GeneratedBy.Assigned(); //Just a guess > on > > > the > > > > > > > > assigned thing since I think your app might generate them > > > > > > > > > > And map your collection like so: > > > > > > > > HasMany<CreditCard>(x => x.CreditCards).AsBag() > > > > > > > > .KeyColumn(PolNbr ); > > > > > > > > > > Viola. Done. No need for a where at all there. > > > > > > > > > > Now, given that I caught a mapping. prefix, I'm assuming > you're > > > using > > > > > an > > > > > > > > automapper. I'd advise against it in your case. It's very > rare to > > > > > expect > > > > > > > > automapper to automagically map for a legacy database > > > environment. > > > > > Swap > > > > > > > to > > > > > > > > Fluent Mappings. > > > > > > > > > > On Tue, Jan 19, 2010 at 1:06 PM, Corey Coogan < > > > [email protected] > > > > > > > > > wrote: > > > > > > > > > I have 2 entities that are described below. I want to map > many > > > > > credit > > > > > > > > > cards to one policy. There is no proper FK between them in > our > > > > > Oracle > > > > > > > > > DB (I can't change the DB at all). They do match up on the > > > > > > > > > PolicyNumber->PolNbr properties though. > > > > > > > > > > > I can't figure out how to map this relationship. Here's > what I > > > > > have > > > > > > > > > so far, but I'm not sure how to specify the Key in the > > > containing > > > > > > > > > entity that doesn't match. > > > > > > > > > > > mapping.HasMany<CreditCard>(x => x.CreditCards) > > > > > > > > > .KeyColumn(PolNbr ) > > > > > > > > > //where to map CreditCard.PolNbr to Policy.PolicyNumber > > > > > > > > > > > Policy > > > > > > > > > { > > > > > > > > > PolicyNumber : string (PK) > > > > > > > > > PolicyDate : date (PK) > > > > > > > > > CreditCards : IList<CreditCard> > > > > > > > > > } > > > > > > > > > > > CreditCard > > > > > > > > > { > > > > > > > > > PolNbr : String (PK) > > > > > > > > > CcType : String (PK) > > > > > > > > > ExpDt : String (PK) > > > > > > > > > //3 more columns that are the PK > > > > > > > > > } > > > > > > > > > > > -- > > > > > > > > > You received this message because you are subscribed to the > > > Google > > > > > > > Groups > > > > > > > > > "Fluent NHibernate" group. > > > > > > > > > To post to this group, send email to > > > > > > > [email protected]. > > > > > > > > > To unsubscribe from this group, send email to > > > > > > > > > [email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > > > > > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > > > > > > > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > > > > > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > > > > > > > > > . > > > > > > > > > For more options, visit this group at > > > > > > > > >http://groups.google.com/group/fluent-nhibernate?hl=en. > > > > > > > > > > -- > > > > > > > > - Hudsonhttp://www.bestguesstheory.comhttp:// > > > > > twitter.com/HudsonAkridge > > > > > > > > > -- > > > > > > > You received this message because you are subscribed to the > Google > > > > > Groups > > > > > > > "Fluent NHibernate" group. > > > > > > > To post to this group, send email to > > > > > [email protected]. > > > > > > > To unsubscribe from this group, send email to > > > > > > > [email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > > > > > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > <fluent-nhibernate%[email protected]<fluent-nhibernate%[email protected]> > > > > > > > > > > > . > > > > > > > For more options, visit this group at > > > > > > >http://groups.google.com/group/fluent-nhibernate?hl=en. > > > > > > > > -- > > > > > > - Hudsonhttp://www.bestguesstheory.comhttp:// > > > twitter.com/HudsonAkridge > > > > > > > -- > > > > > You received this message because you are subscribed to the Google > > > Groups > > > > > "Fluent NHibernate" group. > > > > > To post to this group, send email to > > > [email protected]. > > > > > To unsubscribe from this group, send email to > > > > ... > > > > read more ยป > > -- > You received this message because you are subscribed to the Google Groups > "Fluent NHibernate" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<fluent-nhibernate%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/fluent-nhibernate?hl=en. > > > > -- - Hudson http://www.bestguesstheory.com http://twitter.com/HudsonAkridge--
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