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Re: EOAndQualifier on child entity property
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Re: EOAndQualifier on child entity property


  • Subject: Re: EOAndQualifier on child entity property
  • From: Alexander Spohr <email@hidden>
  • Date: Fri, 18 Aug 2006 09:31:24 +0200


Am 18.08.2006 um 01:47 schrieb Sacha Michel Mallais:

On Aug 17, 2006, at 4:04 PM, Yann Bizeul wrote:

Say an entity MyEntity, having a many-to-many relationship with a Tag entity, the purpose of that is tagging MyEntity with one or more keywords (tags)

Now I want to get all MyEntity having "tag1" AND "tag2" as tags. An EOAndQualifier is nonsense in the result sql since if queries "tag1" = "tag1" AND "tag1" = "tag2", EOOrQualifier is not better since I need to match entries having *both* tags

you need to GROUP BY HAVING. and eof can not do that out of the box.

tip 1:
select them with OR
GROUP BY tag
HAVING COUNT 2 (in your demo it is 2)

alternative (not recommended):
make a second entity of the same Tag-table named Tag2.
then try relationshipToTag.tag = "tag1" AND relationshipToTag2 = "tag2"
this should give a select-statement with two different table-aliases for the tag-table. that worked some years ago, but only with two tags. if you need three tags you need another Entity and so on. don't do it this way :)



Try "myAttribute CONTAINS %s AND myAttribute CONTAINS %s" for a format string, with params of "tag1" and "tag2", as in (warning, untested code):

EOQualifier q = EOQualifier.qualifierWithQualifierFormat ("myAttribute CONTAINS %s AND myAttribute CONTAINS %s", new NSArray (new Object[] {tag1, tag2}));

that does not work either as it just constructs an equal unusable and- clause.



atze


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References: 
 >EOAndQualifier on child entity property (From: Yann Bizeul <email@hidden>)
 >Re: EOAndQualifier on child entity property (From: Sacha Michel Mallais <email@hidden>)

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