mongodb query returns [object Object]

Question

I'm using mongo with NODEJS, but while trying to get data from db, there is always an object it returns [object Object] instead of object; Here is my Schema

IngredientSchema = new MongoDb.Schema(
    {
        "name": String  //名称
        ,"optional":Boolean
        ,"substitution": String
        ,"preparation": String
        , "amount": Number
        , "units": String   //单位
    }
);

directionSchema = new MongoDb.Schema(
    {
        "image": String     //图片
        ,"tip": String
        , "content": String //正文
        , "duration": Number    //定时 无定时则设置为null
        , "audiopath": String
    }
);

infoSchema =  {
    "title": String //菜谱名称
    ,"lang": String
    ,"author":String
    ,"image_url": String
    ,"serves": Number
    ,"source": String
    ,"time":Number
};

categorySchema = {
    "region": String
    ,"type": String
    ,"tags": String
};

CookBookSchema= new MongoDb.Schema(
    {
        "info": infoSchema
        , "categories": categorySchema
        , "ingredients": [IngredientSchema] //材料
        , "directions": [directionSchema]       //步骤
        ,'nutrition':String
    }
    , {strict: false}
);
CookBook= MongoDb.model(COOKBOOK_TABLE, CookBookSchema);

it returns value like this

[
    {
        "categories": "[object Object]",
        ....
    }
]

The other object in result works fine. I searched in google but can't find the answer

In mongodb the "categories" data is like this

categories" : { "type" : "cake", "tags" : "Cake, Caramel Sauce, Chocolate Cake, Chocolate Cake, Chocolate Desserts, Christmas, Christmas Cake, Christmas Desserts, Christmas Party, Coconuts, Desserts, Fruit, German Chocolate Cake, Healthy Cooking, Ice Cream Toppings, Low Sodium, More Fruits, More Holidays, Sauces and Toppings, Valentine's Day" }

But it lack of an _id object which other objects will have

i wrote into mongodb using codes below

```

cookBookModule.create(data, function(err, object) {
            if (err) {
                console.error(err);
                console.log(data);
                return res.status(HTTPCODE.DB_ERR).json('save failed');
            }

            res.status(HTTPCODE.CREATED).json(object);
            TtsModule.audio_process(object);
        })

```

Is there anything wrong?

use JSON.stringify() method to see what your [object object] contains. — Ravi
– Ravi, Commented Sep 22, 2014 at 9:24
yes i did. I printed it with JSON.stringify(). This is not the matter. It just return a string, not an object — Kevin wang
– Kevin wang, Commented Sep 22, 2014 at 9:26
I don't use Mongoose but shouldn't it be categorySchema = new MongoDb.Schema({...})? — yaoxing
– yaoxing, Commented Sep 22, 2014 at 9:33

fmsf · Accepted Answer · 2014-09-22 10:07:13Z

1

"categories": "[object Object]"

This means that when you stored the object, you actually stored the toString() representation of it. As there was none, you got the default [object Object]

Your issue is not on the reading from the database, but on the writing, check how your categories are being serialized into mongo.

answered Sep 22, 2014 at 10:07

fmsf

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2 Comments

Kevin wang Over a year ago

you are right,But when I looked into Mongodb, the "category" is an object, But it's strange that usually objects in Mongo will have an _id object, but this one has none. and also i use Module.create(data, function(err, object){...});Is there anything needs attention?

fmsf Over a year ago

what is inside the data? that's what you should be looking at. Categories don't output an _id because they are inside your cookbook, so the cookbook will have the ID.

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