On Jul 2, 2009, at 6:26 AM, Gustavo Pizano wrote:
On Thu, Jul 2, 2009 at 11:48 AM, David Avendasora <[email protected]
> wrote:
On Jul 2, 2009, at 5:19 AM, Gustavo Pizano wrote:
Hello.
I have the following:
I have a Entity called WG, and one called, TRANSLATIONSET. so the
relationship is WG << >> TRANSLATIONSET.
if I have the wg , I want to get all the TRANSLATIONSET that this
partigual wg has. Whne I was definiyng the EOModel, I set up a
manytomany relationship with a join table called WGxTS and I
unchecked the Flattern box, I read it somewhere.
If all the WGxTS table is doing is being a join table for a many-to-
many relationship, then flattening it I believe is the right thing
to do.
mmmm I see.
so if I do.
NSArray aux = wg.toTranslationSets();
If you don't do flattening, then you'd need something along the
lines of: wg.toTranslationSets().valueForKey("TranslationSet")
oops.. I guess I'll have to go back to the theory,... didn'gt get
why the valueForKey .. I guess its becuase each WGxTS has the
TranslationSet_KEY and WG_KEY so geting the values for those kesy
will create the proper swl command and fetch the right data.. isn't
it?
RIght. If you aren't flattening, then when you call
wg.toTranslationSets() all you are going to get are EOs that represent
the join table (they are valid EOs, they just don't have much
"business" meaning.
Since the join table EOs will have to-one relationships to
TranslationSet and WG, then you have to call the relationship to get
the actual object you are looking for. So, the exact syntax would be
NSArray<TranslationSet> aux =
wg.toTranslationSets().valueForKey(WGxTS.TranslationSet_KEY);
Of course, if you turn flattening back on, it would simply be:
NSArray<TranslationSet> aux = wg.translationSets();
Much cleaner and easier to understand. Actually, if you don't turn
flattening back on, I'd manually flatten it by writing cover methods
for the relationships such as (on the WG entity):
public NSArray<TranslationSet> translationsSets() {
NSArray<TranslationSet> aux =
wg.toTranslationSets().valueForKey(WGxTS.TranslationSet_KEY);
}
Dave
Dave
the contents of aux are all what is in the WGxTS which is not more
than the pk of WG and TRANSLATIONSET related..
What am I missing here, this is the first time Im working with many-
to-many rs.
Thanks in advance
Gustavo
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