Ember You must include an 'id' for customer in an object passed to 'push'

I am using ember 2.7.0.I got the following data from resp API,

{
"accounts": [
{
  "id": "57a3660793d4ba3a5b78a780",
  "status": null,
  "crid": "Someone",
  "deleted": false,
  "accountInfo": {
    "iccid": "accountId",
    "iccidValue": "accountValue"
  },
  "subscriptionInfo": null
},
{
  "id": "57a3660793d4ba3a5b78a780",
  "status": null,
  "crid": "Someone",
  "deleted": false,
  "accountInfo": {
    "iccid": "accountId",
    "iccidValue": "accountValue"
  },
  "subscriptionInfo": null
}
],
"user": {
"id": "288607702394",
"isdn": "491622897075",
"pcc": null
}
}

Created Model for Customer which contain details of all the accounts,users etc:

Customer.js (Model)

export default DS.Model.extend({
    device:DS.hasMany('device'),
    user:DS.belongsTo('user')
});

accounts.js(Model)

status: DS.attr(),
id: DS.attr(),
status: DS.attr(),
crid: DS.attr(),
deleted: DS.attr(),
accountInfo: DS.attr(),
subscriptionInfo: DS.attr()

User.js (Model)

export default DS.Model.extend({
isdn: DS.attr(),
pcc: DS.attr()
});

Created serializer for all the above 3-Models

Customer.js

export default ApplicationSerializer.extend({
normalizeResponse(store, primaryModelClass, payload, id, requestType){
console.log("Entered normalizeResponse",payload );
return this._super(...arguments)
}
});

Device.js

export default ApplicationSerializer.extend({
    primaryKey: 'id'
});

user.js

export default ApplicationSerializer.extend({
primaryKey: 'id'
});

Issue is while running the application i am getting the following issue in chrome console : Assertion Failed: You must include an 'id' for customer in an object passed to 'push'

I do not know how to assign 'id' for customer model.Actually i would like to assign user model id as customer model is that possible? How can achieve it in customer model serializer?In the normalizeResponse of customer serializer i am able to see my response.

Note : I cannot modify the rest response.So option is left with modification of ember data model.

The way i am calling the REST API GET in my controller is

var customer = this.store.findRecord('customer',    this.get('customerID')).then((customer) => {
    console.log("customer::",customer);
  },(resp,status) => {
    console.log("resp:status:",resp,status);
  });

It always entered in to the error response.

Your help should be appreciable.