document : {metas : [

{'name' : 'foo' , 'value' : 42}

,

{'name' : 'bar', 'value' : 55 }

]}

I'd like do be able to do .find(

{'metas.name' : 'foo' }

,

{'metas.$' : 1}

), so it only returns the matching sub-array in the field.