req.body Does not Include Entire Mongoose Model

I am having an annoying problem where req.body does not return the full mongoose model. I'm very new to this stuff so I apologize if this is a dumb question. Here is my model:

var mongoose = require("mongoose");
var campgroundSchema = new mongoose.Schema({
   name: String,
   image: [String],
   image_id: [String],
   description: String,
   author: {
     id: {
        type: mongoose.Schema.Types.ObjectId,
        ref: "User"
     },
     username: String
   },
   comments: [
      {
         type: mongoose.Schema.Types.ObjectId,
         ref: "Comment"
      }
   ]
});
module.exports = mongoose.model("Campground", campgroundSchema);

And here is the result I receive when I console.log(req.body):

{ campground: 
   { name: 'w',
     description: 'w',
     author: { id: 5aaaf25986f338289129f8ea, username: 'frff' } } }

If any more information is required please let me know.

Edit: Here is the route handler:

var imageLength;
var newImage = new Array();
router.post("/", isLoggedIn, upload.array("image"),function(req, res){
    imageLength = req.files.length;
    for(var i = 0; i < imageLength; i++){
        cloudinary.uploader.upload(req.files[i].path, function(result) {
            // add cloudinary url for the image to the campground object under image property
            newImage.push(result.secure_url);
            console.log(newImage[i-1]);
            console.log(req.body);
            req.body.campground.image.push(newImage[i-1]);
            console.log(req.body);
        });
    }