我在 MongoDB 数据库中有一组描述会议地点的文档。它还包含有关会议场所开放时间的信息。
例子:
{
_id: ObjectId("54ccbb90cbcb91146d000001"),
name: "temp_can_add_slots_to_position",
seats: 4,
slots: [
{
_id: ObjectId("54ccbb91cbcb91146d000002"),
start_time: 1441094400,
end_time: 1441096200,
status: "test"
},
{
_id: ObjectId("54ccbb91cbcb91146d000003"),
start_time: 1441096200,
end_time: 1441098000,
status: "open"
},
{
_id: ObjectId("54ccbb91cbcb91146d000004"),
start_time: 1441098000,
end_time: 1441099800,
status: "open"
},
{
_id: ObjectId("54ccbb91cbcb91146d000005"),
start_time: 1441099800,
end_time: 1441101600,
status: "open"
},
{
_id: ObjectId("54ccbb91cbcb91146d000006"),
start_time: 1441101600,
end_time: 1441103400,
status: "open"
},
{
_id: ObjectId("54ccbb91cbcb91146d000007"),
start_time: 1441103400,
end_time: 1441105200,
status: "open"
},
{
_id: ObjectId("54ccbb91cbcb91146d000008"),
start_time: 1441105200,
end_time: 1441107000,
status: "open"
},
],
type: "private"
}
我想搜索文档并仅返回文档,其中包含状态为“打开”的子文档。我似乎无法编写可以实现此目的的“查找”子句。
例如,我想要上面的文档,除了对象 ID 为 54ccbb91cbcb91146d000002 的“插槽”子文档之外,其他文档保持不变。
例如,这将返回整个文档:
find({_id: ObjectId("54ccbb90cbcb91146d000001"),"slots.status": "open"}).limit(10)
(实际上位于一些看起来像这样的 Ruby 中):
def list_open_slots_at_a_position(id)
working_position = @coll.find( { "_id:" => "ObjectId(\"#{id}\")", "slots.status:" => "open" } ).to_a
puts working_position
end
我究竟做错了什么 ?