how to validate mongodb embedded document

Question

MongoDB 3.2 has this nice validation feature . However, in this doc it only shows me how to do the validation on first level fields. If I have the following embedded document to insert, how could I set the validation rule?

{"name": {
          "first_name": "xx",
          "last_name": "yy"
         }
}

I've tried the following but it doesn't work,

db.createCollection( "name_collection",
    { validator: { $and:
        [
            {name.first_name: {$type: "string"}},
            {name.last_name: {$type: "string"}}
        ]
    }
)

Thanks in advance.

Answer 1

Here are the test codes, it works well

> db.createCollection('name', {validator: {$and: [{"name.first_name": {$type: 'string'}}, {"name.last_name": {$type: 'string'}}]}})
{ "ok" : 1 }

It seems you should add "" to name.last_name ,

Test it with valid data

> db.name.insert({name: {first_name: 'xx', last_name: 'yy'}})
WriteResult({ "nInserted" : 1 })

Test it with invalid data

> db.name.insert({name: {first_name: 'xx', last_name: 3}})
WriteResult({
        "nInserted" : 0,
        "writeError" : {
                "code" : 121,
                "errmsg" : "Document failed validation"
        }
})

> db.name.find()
{ "_id" : ObjectId("56e8b644f33ed6e7f3c57f90"), "name" : { "first_name" : "xx",
"last_name" : "yy" } }

Answer 2

Well you have couple errors in your code snippet.

Your db.createCollection doesn't have matching braches. It should look like

db.createCollection("name_collection", {
  validator: { $and:[
    {'name.first_name': {$type: "string"}},
    {'name.last_name': {$type: "string"}}
  ]}
})

To verify if validation is working or not, try inserting partial data

 db.name_collection.insert({name:{first_name:0, last_name:0}})

See I'm just assigning numeric value to first_name and last_name so validation should fail.

After execution of above query, It gives following error.

WriteResult({
    "nInserted" : 0,
    "writeError" : {
        "code" : 121,
        "errmsg" : "Document failed validation"
    }
})

But if I assign text as pasted below, insertion should succeed which does.

db.name_collection.insert({name:{first_name:'f_name', last_name:'l_name'}})

Result:

WriteResult({ "nInserted" : 1 })

Hope this is what are you looking.