UnhandledPromiseRejectionWarning: TypeError: mongoConnection.model is not a function

[Aquazee]

(node:79684) UnhandledPromiseRejectionWarning: TypeError: mongoConnection.model is not a function
at Users.setDbModel (/Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/build/src/models/users.js:36:43)
at new Users (/Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/build/src/models/users.js:17:14)
at Function.getInstance (/Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/build/src/models/users.js:21:26)
at /Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/build/src/controllers/mongo.js:15:51
at Generator.next ()
at /Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/build/src/controllers/mongo.js:8:71
at new Promise ()
at __awaiter (/Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/build/src/controllers/mongo.js:4:12)
at mongoController (/Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/build/src/controllers/mongo.js:14:39)
at Layer.handle [as handle_request] (/Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/node_modules/express/lib/router/layer.js:95:5)
at /Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/node_modules/express/lib/router/index.js:281:22
at Function.process_params (/Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/node_modules/express/lib/router/index.js:335:12)
at next (/Users/sds-sudip.sharma/Documents/Projects/Example/express-microservice-boilerplate-develop/node_modules/express/lib/router/index.js:275:10)
(node:79684) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:79684) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.