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Type:
Question
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Resolution: Done
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Priority:
Minor - P4
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Affects Version/s: 2.4.0
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Component/s: Internal Client
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Environment:Ubuntu 13.04, MongoDB C++ 2.4
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In my MongoDB database I have documents of this form:
{ "timestamp" : "2012-01-15T17:56:14.85",
"Event" : [ { "id" : "1851236846",
"qualifier_id" : "209"
},
{
"id" : "378258775",
"qualifier_id" : "57",
"value" : "1"
}
]
}
{ "timestamp" : "2012-01-15T16:06:09.378"
}
Some of them contain the array Event some don't.
When I'm trying to process the data using the C++ MongoDB driver 2.4:
while (cursor->more()) { BSONObj bo = cursor->next(); cout << "timestamp: " << bo.getStringField("timestamp") << std::endl; if(bo.hasElement("Event")) { cout<<"HERE"<< endl; std::vector<BSONElement> be = bo.getField("Event").Array(); // ---> at this line breaks!! for (unsigned int j = 0; j < be.size(); j++) { BSONObj bo2 = be[j].embeddedObject(); cout << "Qualifier ID: " << bo2.getStringField("qualifier_id") << std::endl; cout << "Value: " << bo2.getStringField("value")<< std::endl; } }
I get this error:
timestamp: 2012-01-15T16:06:07.560 HERE Qualifier ID: 212 Value: 14.6 Qualifier ID: 141 Value: 89.2 Qualifier ID: 213 Value: 5.9 Qualifier ID: 56 Value: Back Qualifier ID: 140 Value: 46.7 timestamp: 2012-01-15T16:06:09.378 HERE Sun Jul 21 20:06:16.974 Assertion: 13111:wrong type for field (Event) 3 != 4 caught wrong type for field (Event) 3 != 4
In conclusion the condition bo.hasElement("Event") is always true.(???) The program brakes here:
std::vector<BSONElement> be = bo.getField("Event").Array();
When the array Event has no members.