A long day, and my brain is not computing this one. Either it is
obvious and I cannot see it, or my solution at the end is one of a
number of complicated ways to do the non-obvious .... either way,
someone here probably has seen this before.
I had to do some refactoring and kill one side of a toMany that was
just getting too big to have anymore.
The last artifact I have left is an EOQualifier for a two-hop keyPath
and my brain is just not giving it to me if it is obvious
1) Before I got rid of one side of the huge relationship I had this:
CTMediaTemplate <-->> CTMessage <<--> CTJob
2) After refactoring out the toMany of the first entity shown above to
the second entity, I have this:
CTMediaTemplate <----- CTMessage <<--> CTJob
The problem: I had a method in CTJob that returned a fetch spec for
the CTMediaTemplate.
public ERXFetchSpecification<CTMediaTemplate>
fetchSpecificationForMediaTemplates() {
EOQualifier q =
CTMediaTemplate.XKEY_MESSAGES.append(CTMessage.XKEY_JOB).eq(this);
ERXFetchSpecification<CTMediaTemplate> fs = new
ERXFetchSpecification<CTMediaTemplate>(CTMediaTemplate.ENTITY_NAME, q,
null,true,false,null);
return fs;
}
FYI, the qualifier translated into normal plain WO would be sth like
this:
q = new EOKeyValueQualifier( "messages.job",
EOQualifier.QualifierOperatorEquals, this );
So my "messages" relationship from CTMediaTemplate to CTMessage is now
gone and so cannot be used in the qualifier keypath. How do I qualify
the CTMediaTemplate objects now without that part of the keypath?
My (possibly overkill) solution I was thinking of was actually
creating a flattened toMany (which feels dirty) in the EOModel like this
CTMediaTemplate <<-------(flattened relationship in CTJob:
"mediaTemplates" = "messages.mediaTemplate") -------- CTJob
... just so I could do something like the following in a CTJob
instance to create the qualifier using
EORelationship.qualifierWithSourceRow(...) ..... but it seems like
there might be an easier way that I am not seeing that would avoid me
needing to create that flattened toMany from CTJob to CTMediaTemplate
which feels sloppy .... any suggestions?
<snip>
String aKey = "mediaTemplates";
this.willRead();
EOEntity anEntity = entity();
EORelationship aRelationship =
anEntity.relationshipNamed(aKey);
EOEditingContext anEditingContext = this.editingContext();
EOGlobalID aGlobalID =
anEditingContext.globalIDForObject(this);
String aModelName = anEntity.model().name();
EODatabaseContext aDatabaseContext =
EOUtilities.databaseContextForModelNamed(anEditingContext,
aModelName);
NSDictionary aRow = null;
aDatabaseContext.lock();
try {
aRow = aDatabaseContext.snapshotForGlobalID(aGlobalID);
} finally {
aDatabaseContext.unlock();
}
EOQualifier q = aRelationship.qualifierWithSourceRow(aRow);
</snip> _______________________________________________
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