I see a lot of similarly worded questions here, but none has solved my problem.
I have a document like this:
{'_id': ObjectId('5006916af9cf0e7126000000'),'data': [{'count': 0,'alis':'statsministeren','avis':'Ekstrabladet'}, {'count': 0,'alis':'thorning','avis':'Ekstrabladet'}, {'count': 0,'alis':'socialdemokratiets formand','avis':'Ekstrabladet'}, {'count': 0,'alis':'lars barfod','avis':'Ekstrabladet'}, {'count': 0,'alis':'formand for det konservative folkeparti','avis':'Ekstrabladet'}, {'count': 0,'alis':'s\xf8vndal','avis':'Ekstrabladet'}, {'count': 0,'alis': u"sf's formand",'avis':'Ekstrabladet'}, {'count': 0,'alis':'m\xf6ger','avis':'Ekstrabladet'}, {'count': 0,'alis':'lars l\xf8kke','avis':'Ekstrabladet'}, {'count': 0,'alis':'l\xf8kke rasmussen','avis':'Ekstrabladet'}, {'count': 0,'alis':'lederen af danmarks st\xf8rste parti','avis':'Ekstrabladet'}, {'count': 0,'alis':'Pia Kj\xe6rsgaard','avis':'Ekstrabladet'}, {'count': 0,'alis':'statsministeren','avis':'Information'}, {'count': 1,'alis':'thorning','avis':'Information'}, {'count': 0,'alis':'socialdemokratiets formand','avis':'Information'}, {'count': 0,'alis':'lars barfod','avis':'Information'}, {'count': 0,'alis':'formand for det konservative folkeparti','avis':'Information'}, {'count': 0,'alis':'s\xf8vndal','avis':'Information'}, {'count': 0,'alis': u"sf's formand",'avis':'Information'}, {'count': 0,'alis':'m\xf6ger','avis':'Information'}, {'count': 0,'alis':'lars l\xf8kke','avis':'Information'}, {'count': 0,'alis':'l\xf8kke rasmussen','avis':'Information'}, {'count': 0,'alis':'lederen af danmarks st\xf8rste parti','avis':'Information'}, {'count': 0,'alis':'Pia Kj\xe6rsgaard','avis':'Information'}, {'count': 0,'alis':'statsministeren','avis':'Berlingske'}, {'count': 0,'alis':'thorning','avis':'Berlingske'}, {'count': 0,'alis':'socialdemokratiets formand','avis':'Berlingske'}, {'count': 0,'alis':'lars barfod','avis':'Berlingske'}, {'count': 0,'alis':'formand for det konservative folkeparti','avis':'Berlingske'}, {'count': 1,'alis':'s\xf8vndal','avis':'Berlingske'}, {'count': 0,'alis': u"sf's formand",'avis':'Berlingske'}, {'count': 0,'alis':'m\xf6ger','avis':'Berlingske'}, {'count': 0,'alis':'lars l\xf8kke','avis':'Berlingske'}, {'count': 0,'alis':'l\xf8kke rasmussen','avis':'Berlingske'}, {'count': 0,'alis':'lederen af danmarks st\xf8rste parti','avis':'Berlingske'}, {'count': 0,'alis':'Pia Kj\xe6rsgaard','avis':'Berlingske'}, {'count': 0,'alis':'statsministeren','avis':'JP'}, {'count': 0,'alis':'thorning','avis':'JP'}, {'count': 0,'alis':'socialdemokratiets formand','avis':'JP'}, {'count': 0,'alis':'lars barfod','avis':'JP'}, {'count': 0,'alis':'formand for det konservative folkeparti','avis':'JP'}, {'count': 0,'alis':'s\xf8vndal','avis':'JP'}, {'count': 0,'alis': u"sf's formand",'avis':'JP'}, {'count': 1,'alis':'m\xf6ger','avis':'JP'}, {'count': 0,'alis':'lars l\xf8kke','avis':'JP'}, {'count': 0,'alis':'l\xf8kke rasmussen','avis':'JP'}, {'count': 0,'alis':'lederen af danmarks st\xf8rste parti','avis':'JP'}, {'count': 0,'alis':'Pia Kj\xe6rsgaard','avis':'JP'}, {'count': 0,'alis':'statsministeren','avis':'BT'}, {'count': 0,'alis':'thorning','avis':'BT'}, {'count': 0,'alis':'socialdemokratiets formand','avis':'BT'}, {'count': 0,'alis':'lars barfod','avis':'BT'}, {'count': 0,'alis':'formand for det konservative folkeparti','avis':'BT'}, {'count': 0,'alis':'s\xf8vndal','avis':'BT'}, {'count': 0,'alis': u"sf's formand",'avis':'BT'}, {'count': 0,'alis':'m\xf6ger','avis':'BT'}, {'count': 0,'alis':'lars l\xf8kke','avis':'BT'}, {'count': 0,'alis':'l\xf8kke rasmussen','avis':'BT'}, {'count': 0,'alis':'lederen af danmarks st\xf8rste parti','avis':'BT'}, {'count': 0,'alis':'Pia Kj\xe6rsgaard','avis':'BT'}, {'count': 0,'alis':'statsministeren','avis':'Politiken'}, {'count': 0,'alis':'thorning','avis':'Politiken'}, {'count': 0,'alis':'socialdemokratiets formand','avis':'Politiken'}, {'count': 0,'alis':'lars barfod','avis':'Politiken'}, {'count': 0,'alis':'formand for det konservative folkeparti','avis':'Politiken'}, {'count': 0,'alis':'s\xf8vndal','avis':'Politiken'}, {'count': 0,'alis': u"sf's formand",'avis':'Politiken'}, {'count': 0,'alis':'m\xf6ger','avis':'Politiken'}, {'count': 0,'alis':'lars l\xf8kke','avis':'Politiken'}, {'count': 0,'alis':'l\xf8kke rasmussen','avis':'Politiken'}, {'count': 0,'alis':'lederen af danmarks st\xf8rste parti','avis':'Politiken'}, {'count': 0,'alis':'Pia Kj\xe6rsgaard','avis':'Politiken'}],'time':'2012-07-18 12:35:22.241245'}
I.e.:
{_objectId : xxx, time: yyy, data :[ 72 similar dicts in this array ]}
I want to retrieve values from within one of the 72 dicts.
My first attempt was something along these lines:
db.observations.find({'data.avis':'Ekstrabladet', 'data.alis':'thorning'}, {'data.count':1})
That would retrieve 72 count
dicts, when what I really wanted was the count value for the array which satisfies both avis:ekstrabladet
and alis:thorning
(only one array). But instead mongo returns the whole document.
I have foundt $elemMatch, but I get the same output.
db.observations.find({'data' : {$elemMatch: {'alis':'thorning','avis':'Ekstrabladet'}}},{'data.count':1})
I guess I could iterate over the complete document in python (this is for a flask app), but it doesn't seem very elegant.
So my question is: How do I reach inside a document and grab values from a nested document of arrarys?
Bonus: As I am new to all sorts of databases I only chose mongodb because it seemed very nice and flexible, and because I don't work with critcal data. But I have no need for scalability and could use e.g. sqlite instead. If you have strong opinions about me using the wrong tool for the job - then please abuse me.