Re: How to fetch Null objects
Re: How to fetch Null objects
- Subject: Re: How to fetch Null objects
- From: Chuck Hill <email@hidden>
- Date: Tue, 5 Jun 2007 15:46:33 -0700
Something just feels wrong here with Ted's code.
On Jun 5, 2007, at 2:38 PM, Pierre Bernard wrote:
new EOKeyValueQualifier(
"postingsForMonth" /* let EOGenerator create a constant */,
EOQualifier.QualifierOperatorEqual,
NSKeyValueCoding.NullValue);
postingsForMonth sounds like a multiple (to-many) relationship. But
if "objectIDPostingsForMonth is a foreign key", that would be a to-
one relationship. Pierre's code is correct for a to-one
relationship. It feels like you are modelling things wrong or naming
them in a confusing manner.
Chuck
Pierre Bernard
Houdah Software s.à r.l.
On Jun 5, 2007, at 11:17 PM, Ted Archibald wrote:
I forgot to mention that "objectIDPostingsForMonth" is a foreign
key and the relationship in the entity Posting is called
"postingsForMonth"
On 6/5/07, Ted Archibald <email@hidden> wrote: Is there
a more elegant way of trying to fetch null objects?
Currently I have an object 'Posting' with a fetch spec
'fetchNullPostingForMonth' with the qualifier
'(objectIDPostingsForMonth = nil)'
Then in my code I have:
NSArray results =
EOUtilities.objectsWithFetchSpecificationAndBindings( ec,
"Posting", "fetchNullPostingForMonth", null);
To me this seems crude, but it does work. Is there a better way
though?
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