How to refer one schema inside another with mongoose?

I have Schema defined for the location as follows,

locationSchema.js

module.exports = function () {
    var locationSchema = {
        city: {
            type: String
        },
        latitude: {
            type: String
        },
        country: {
            type: String
        },
        venue: {
            type: String
        },
        located_in: {
            type: String
        },
        state: {
            type: String
        },
        street: {
            type: String
        },
        zip: {
            type: String
        }
    };
    return locationSchema;
}

I want to use this schema inside another file which has the parent schema as follows, here i am refering the file for the locationSchema . how should i modify the following?

module.exports = function (dbService) {
    var model = null;
    var modelName = '_purchase';
    var locationSchema = require('CommonSchema/locationSchema');
    try {
        model = dbService.getModel(modelName);
    }
    var locationSchema = dbService.createEntityDef(locationSchema)
    var eventSchema = dbService.createEntityDef({
           eventId: {
                type: String
            },
            name: {
                type: String
            },
            category: {
                type: String
            },
            date: dateSchema,
            location: locationSchema

        })

It throws an error [ 'Error: Cannot find module \'CommonSchema/locationSchema\'',

via face turn