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From Kenneth Tyler <...@8thfold.com>
Subject Re: Conditional joins
Date Fri, 17 Sep 2010 14:08:13 GMT
Sorry,
I missed an important part of your question.
Two views would work. It might be that building a composite key would also
work, since you have the domain information in all the user documents.
function(doc){if(doc.type=='user'){emit([doc.domain,doc.status],doc)}

and then query the view looking for [test.com,1]

ken tyler

On Fri, Sep 17, 2010 at 6:56 AM, Kenneth Tyler <ken@8thfold.com> wrote:

> Simon,
> I think this is a case where the flat document structure of couch documents
> makes things much simpler than in SQL.
>
> If you had a view like this:
> function(doc){if(doc.type=='user'){emit(doc.status,doc)}
> then it would return all the user documents with their status as their key
> and you could use ?key="1" (i think the quotes are necessary) to get all
> the users whose status is 1
>
> if you want to do the same thing for domains, you just write a "domain"
> view that returns status as the key
>
> ken tyler
>
>
> On Fri, Sep 17, 2010 at 6:04 AM, Simon Woodhead <
> simon.woodhead@simwood.com> wrote:
>
>> Hi folks,
>>
>> I'm pretty green with views and have a need to do a join with results
>> from one side returned if a condition is met on the other. In SQL I'd
>> do:
>>
>> select * from child join parent on child.id=parent.id where
>> parent.status=1;
>>
>> I've read the 'join' documentation (e.g.
>> http://www.cmlenz.net/archives/2007/10/couchdb-joins) and can return
>> documents of multiple types with matching keys ok. What I can't do is
>> do the same but only if the parent matches a condition.
>>
>> Specifically, my data is like:
>>
>>
>> {"45a6951b34a6f45bd44fd169c0003f9c","_rev":"1-6c88818b43d562c45e452bf00db06ee2","type":"domain","domain":"
>> test.com","status":1},
>>
>> {"_id":"45a6951b34a6f45bd44fd169c00046db","_rev":"1-37eaf0c4944dac9f5fe07b25c0b68b1d","type":"domain","domain":"
>> test2.com","status":0},
>>
>> {"_id":"45a6951b34a6f45bd44fd169c00053d9","_rev":"3-729f46c86ee4984941939c65787126fb","type":"user","domain":"
>> test.com","user":"foo","password":"test123"},
>>
>> {"_id":"45a6951b34a6f45bd44fd169c00060c8","_rev":"1-46997eba12e7adbb6e9266a1fe83c42d","type":"user","domain":"
>> test2.com","user":"bar","password":"test123"}
>>
>> I want to be be able to query a view by domain and see all users for
>> it if the status is 1. So in this case I'd see users for test.com but
>> not for test2.com.
>> Any help would be appreciated.
>>
>> Thanks!
>> Simon
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>

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