I have a MongoDB collection with documents in the following format:
{
"_id" : ObjectId("4e8ae86d08101908e1000001"), "name" : ["Name"], "zipcode" : ["2223"] } { "_id" : ObjectId("4e8ae86d08101908e1000002"), "name" : ["Another ", "Name"], "zipcode" : ["2224"] }
I can currently get documents that match a specific array size:
db.accommodations.find({ name : { $size : 2 }})
This correctly returns the documents with 2 elements in the name
array. However, I can‘t do a $gt
command to return all documents where the name
field has an array size of greater than 2:
db.accommodations.find({ name : { $size: { $gt : 1 } }})
How can I select all documents with a name
array of a size greater than one (preferably without having to modify the current data structure)?
解决办法:
1.db.accommodations.find( { $where: "this.name.length > 1" } );
2.db.accommodations.find({‘name.1‘: {$exists: true}})
说明:name.1是name字段(Array类型)的第二个索引(从0开始)
时间: 2024-10-13 02:32:57