app.get('/sample-edit/:cid',
    setRender('dashboard/sample-edit.hbs'),
    setRedirect({auth: '/'}),
    isAuthenticated,
    users.getSampleEdit);

var userSchema = new mongoose.Schema({
  email: { type: String, unique: true, lowercase: true },
  password: String,

  profile: {
  name: { type: String, default: '' },
  location: { type: String, default: '' }
  },
  image: {
   path: { type: String, default: '' },
   },
  sample:
    [{
      name: String,
      description: String,
      purchase: String,
      brand: String,
      material: String,
      notes: String,
      qty: String,
      imgpath: String,
    }],
  resetPasswordToken: String,
  resetPasswordExpires: Date
  });

exports.getSampleEdit = function(req, res, next){
User.findById(req.user.id, { sample: { $elemMatch: { _id: ObjectId } } },
function(err, user) {
if (err) return next(err);

var form = {},
error = null,
formFlash = req.flash('form'),
errorFlash = req.flash('error');

if (formFlash.length) {
form.email = formFlash[0].email;
}
if (errorFlash.length) {
error = errorFlash[0];
}
res.render(req.render, {user: req.user, form: form, error: error});

console.log(req.params.id)

});

};

<form action="/user/sample" method="POST" class="form-horizontal">

        <div class="form-group">
            <label for="name" class="col-sm-3 control-label">Sample Name:</label>
            <div class="col-lg-offset-3 col-sm-4"><input type="text" name="name" id="name" value="{{sample.name}}" class="form-control"></div>
        </div>

        <div class="form-group">
            <label for="description" class="col-sm-3 control-label">Description:</label>
            <div class="col-sm-4"><input type="text" name="description" id="description" value="{{sample.description}}" class="form-control"></div>
        </div>

        <div class="form-group">
            <label for="description" class="col-sm-3 control-label">Where did you buy it from?</label>
            <div class="col-sm-4"><input type="text" name="purchase" id="purchase" value="{{sample.purchase}}" class="form-control"></div>
        </div>

        <div class="form-group">
            <label for="description" class="col-sm-3 control-label">Brand:</label>
            <div class="col-sm-4"><input type="text" name="brand" id="brand" value="{{sample.brand}}" class="form-control"></div>
        </div>

        <div class="form-group">
            <label for="description" class="col-sm-3 control-label">Material:</label>
            <div class="col-sm-4"><input type="text" name="material" id="material" value="{{sample.material}}" class="form-control"></div>
        </div>

        <div class="form-group">
            <label for="description" class="col-sm-3 control-label">Notes:</label>
            <div class="col-sm-4"><input type="text" name="notes" id="notes" value="{{sample.notes}}" class="form-control"></div>
        </div>

        <div class="form-group">
            <label for="description" class="col-sm-3 control-label">How much sample do you have?</label>
            <div class="col-sm-4"><input type="text" name="qty" id="qty" value="{{sample.qty}}" class="form-control"></div>
        </div>

        <div class="form-group">
            <label for="description" class="col-sm-3 control-label">Image</label>
            <div class="col-sm-4"><input type="text" name="imgpath" id="imgpath" value="{{sample.imgpath}}" class="form-control"></div>
        </div>



        <div class="form-group">
            <div class="col-sm-offset-3 col-sm-4"><button type="submit" class="btn btn-primary"><span class="ion-edit"></span>Save Sample</button></div>
        </div>
    </form>