docval2

db.orders.runCommand("collMod", 
                   {validationLevel: "moderate", 
                    validationAction: "error"});

db.runCommand({collMod: "orders", 
               validator: {
                  price: {$exists: true},
                  price: {$type: 1}
                }
              });
```

The validation rules for this collection can now be checked:
```javascript
db.getCollectionInfos({name:"orders"})
[
  {
    "name": "orders",
    "options": {
      "validator": {
        "price": {
          "$type": 1
        }
      },
      "validationLevel": "moderate",
      "validationAction": "error"
    }
  }
]