CODEWITHSUNDEEP
javascriptnode.jsmongodbmongoose
Hunter
Hunter

Reputation: 1601

Mongo DB Schema arrange and get correct data from nested array in search

I am learning backend coding

I am using single collection to data save to db Collection name is book , each book has few nested arrays (like category and may be sub categories )

I have to show all categories title of each books in client side in category search scenario.

book = [
          {
            name: '';
            ----------
            ----------
            category:[
                      {
                         title: ''
                      }
                      ----------
                      ----------
            ]
          }
       ]

How to find and get data using mongoose ? Do I have to create separate collection for nested arrays ? is that right way? 

   // Get all category
    exports.Allcategory = function(req, res){        
        Book.find({}, function(err, category){
            if (err) return res.json({message: 'Error on the server!', status: 500 });
            return res.json(category); 
        });
    };

Upvotes: 0

Views: 50

Answers (1)

Malik Awan
Malik Awan

Reputation: 463

In your Backend code, you are sending whole document of Book, not just category array. In your case this approach will be like this.

Books.map(item => 
 {item.name}  // this will print book name. in this iteration you can get any property defined at this level
     {item.category.map(c => ){
     {c.title} //this will print category name
}}    
){

}

Upvotes: 0

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