I have the following model relationship in my LoopBack 4 application: A Survey has 1-many relationship with Question, Question has 1-many relationship with Option.
Am using MongoDB as the database. I am unable to figure out how to implement a PUT/PATCH REST api, that can update the entire Survey model containing the Questions and Options. I get the following exception when i try a PATCH on the sample request JSON below:
Exception: Unhandled error in PATCH /5be3e00aad0df83d10e580d1: 500 TypeError: Class constructor Question cannot be invoked without 'new' at Function.DataAccessObject._coerce (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\dao.js:1799:22) at doUpdate (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\dao.js:2735:20) at C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\dao.js:2714:11 at doNotify (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:155:49) at doNotify (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:155:49) at Function.ObserverMixin._notifyBaseObservers (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:178:5) at Function.ObserverMixin.notifyObserversOf (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:153:8) at Function.ObserverMixin._notifyBaseObservers (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:176:15) at Function.ObserverMixin.notifyObserversOf (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:153:8) at C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\dao.js:2699:11 at doNotify (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:155:49) at doNotify (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:155:49) at Function.ObserverMixin._notifyBaseObservers (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:178:5) at Function.ObserverMixin.notifyObserversOf (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:153:8) at Function.ObserverMixin._notifyBaseObservers (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:176:15) at Function.ObserverMixin.notifyObserversOf (C:\Users\nk\Documents\Project\backend\surveyService\node_modules\loopback-datasource-juggler\lib\observer.js:153:8)
Sample PATCH request:
[{
"title": "Some survey title 1",
"description": "Some survey title 1",
"questions": [{
"options": [{
"description": "Some option description 1",
"type": "Option"
}],
"description": "Some question description 1"
}]
}]
Have not been able to find any helpful information on this yet. Any pointers please?
Thanks in advance.
