I have the following class (in JDO)
Class Person{
@Persistent private List tags = ArrayList()
}
I want to let the user query a person based on his/her tag, so I had
my query filter like this:
tags.contains(tagValue1)
and if the user want to search for multiple tags, I would just add to
the filter so if the user is searching for 3 tags, then the query
would be
tags.contains(tagValue1) && tags.contains(tagValue2) &&
tags.contains(tagValue3)
I think this approach is wrong, because the datastore then needs to
have an index that have the tags property three times... and if the
user search for more than 3 tags at a time then it will be broken.
What's the proper way to do this? Do you guys have any suggestions?
In addition, I thought the index should like this
person1, tagValue1
person1, tagValue2
person1, tagValue3
i.e an additional row for each value in the multi-value property, and
GAE should do a merge join to get me the result.
But my index file looks like this
<datastore-index kind="Person" ancestor="false" source="auto">
<property name="tags" direction="asc"/>
<property name="tags" direction="asc"/>
<property name="tags" direction="asc"/>
<property name="tags" direction="asc"/>
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