How to get rid of Error: “OverwriteModelError: Cannot overwrite `undefined` model once compiled.”?

Question

I have a common method for updating document of any collection in MongoDB?

The following code is in file name Deleter.js

module.exports         


        

Answer 1

I found it better to avoid global and exception handing-

var mongoose = require("mongoose");
var _ = require("underscore");

var model;
if (_.indexOf(mongoose.modelNames(), "Find")) {
    var CategorySchema = new mongoose.Schema({
        name: String,
        subCategory: [
            {
                categoryCode: String,
                subCategoryName: String,
                code: String
            }
        ]
    }, {
        collection: 'category'
    });
    model = mongoose.model('Category', CategorySchema);
}
else {
    model = mongoose.model('Category');
}


module.exports = model;