/home/ec2-user/YourProject/node_modules/mongoose/lib/index.js:

      throw new mongoose.Error.MissingSchemaError(name);

      ^

MissingSchemaError: Schema hasn't been registered for model "YourModel".

Use mongoose.model(name, schema)

    at new MissingSchemaError (/home/ec2-user/YourProject/node_modules/mongoose/lib/error/missingSchema.js:20:11)

    at Mongoose.model (/home/ec2-user/YourProject/node_modules/mongoose/lib/index.js:391:13)

    at Object.<anonymous> (/home/ec2-user/YourProject/YourScript.js:4:27)

    at Module._compile (internal/modules/cjs/loader.js:722:30)

    at Object.Module._extensions..js (internal/modules/cjs/loader.js:733:10)

    at Module.load (internal/modules/cjs/loader.js:620:32)

    at tryModuleLoad (internal/modules/cjs/loader.js:560:12)

    at Function.Module._load (internal/modules/cjs/loader.js:552:3)

    at Function.Module.runMain (internal/modules/cjs/loader.js:775:12)

    at startup (internal/bootstrap/node.js:300:19)

    at bootstrapNodeJSCore (internal/bootstrap/node.js:826:3)

require('./yourModel.js');

const mongoose = require('mongoose');

mongoose.connect("mongodb://localhost/YourDatabase");

const YourModel = mongoose.model('YourModel');

const mongoose = require('mongoose');

const Schema = mongoose.Schema;

const YourModelSchema = new Schema({

    something1: { type: String, required: '`something1` must be filled', unique: true },

    something2: { type: String },

});

module.exports = mongoose.model('YourModel', YourModelSchema);