Schema Inheritance Error (TypeError: Cannot read property '0' of undefined)

[xulong3370]

When I try schema inheritance :

var mongoose = require('mongoose'),
    extend = require('mongoose-schema-extend');
var Schema = mongoose.Schema;

var PersonSchema = new Schema({
    name : String
}, { collection : 'users' });

var EmployeeSchema = PersonSchema.extend({
    department : String
});

var Person = mongoose.model('Person', PersonSchema),
    Employee = mongoose.model('Employee', EmployeeSchema);

I get the following error:

"E:\Program Files\JetBrains\WebStorm 2017.1.1\bin\runnerw.exe" "C:\Program Files\nodejs\node.exe" D:\Users\test_extend\test.js
D:\Users\test_extend\node_modules\mongoose\lib\services\model\applyHooks.js:34
if (pair[0] !== 'pre' && pair[0] !== 'post' && pair[0] !== 'on') {
^

TypeError: Cannot read property '0' of undefined
at applyHooks (D:\Users\test_extend\node_modules\mongoose\lib\services\model\applyHooks.js:34:13)
at Function.compile (D:\Users\test_extend\node_modules\mongoose\lib\model.js:3636:3)
at Mongoose.model (D:\Users\test_extend\node_modules\mongoose\lib\index.js:417:22)
at Object. (D:\Users\test_extend\test.js:17:25)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:393:7)
at startup (bootstrap_node.js:150:9)
at bootstrap_node.js:508:3

Process finished with exit code 1

It looks like the following code cause the error:

var EmployeeSchema = PersonSchema.extend({
    department : String
});

 Employee = mongoose.model('Employee', EmployeeSchema);`

[Climax777]

Same for me. Upgraded from mongoose 4.9.1 to 4.9.8

[Climax777]

@xulong3370 have you been able to find a workaround?

[xulong3370]

@Climax777 not resolve so far....

[mwlvandermaat]

Still no workaround?

[Climax777]

@mwlvandermaat not that I know of

[pcemma]

Is there a solution for this issue?

[sde-turner]

I confirm I am facing a similar issue.

For what it's worth the last working Mongoose version I can find with 0.2.2 of mongooses-schema-extend that is working is 4.9.7

[amorimdub]

I got the same error.

My mistake was: I was initializing the child's model before father's model.

Please, double check which one is load first.

[pcemma]

Nope. It's still not working. I'm sure that parent model is initialized before children one.

[hoangnguyenba]

Still not fixed :(

[InsomniakDev]

almost one year later still not resolved :'(