ember.js - Why is ember-data 2.7.0 normalizeHelper expecting a JSON API response from my custom adapter? -

i have ember-cli project uses jsonapi adapter, via adapters/application.js. want add model class should use ember-localstorage-adapter. declare model , respective adapter , serializer:

 models/widget.js  import ds 'ember-data';  export default ds.model.extend({...});   adapters/widget.js  import lsadapter 'ember-localstorage-adapter';  export default lsadapter.extend({});   serializers/widget.js  import lsserializer 'ember-localstorage-adapter';  export default lsserializer.extend({}); 

and load models in route:

 routes/index.js  import ember 'ember';  export default ember.route.extend({     model() {       return this.store.findall('widget');     }  }); 

this should work, missing function type error:

ember.debug.js:19755 typeerror: serializer.normalizeresponse not function   @ normalizeresponsehelper (serializer-response.js:80)   @ finders.js:147   @ object.run (ember.debug.js:295)   @ class._adapterrun (store.js:2056)   @ finders.js:146   @ trycatch (ember.debug.js:52052)   @ invokecallback (ember.debug.js:52067)   @ publish (ember.debug.js:52035)   @ ember.debug.js:41262   @ invoke (ember.debug.js:991) 

ok, add missing method:

 serializers/widget.js  import lsserializer 'ember-localstorage-adapter';  export default lsserializer.extend({    normalizeresponse: function(store, modelclass, payload, id, requesttype) {      return payload;    }  }); 

and error payload:

 ember.debug.js:19755 error: assertion failed: normalizeresponse must return valid json api document:     * 1 or more of following keys must present: "data", "errors", "meta".     @ new error (native)     @ error.embererror (../assets/vendor.js:30247:21)     @ assert (../assets/vendor.js:17276:13)     @ object.assert (../assets/vendor.js:30059:34)     @ assert (../assets/vendor.js:97498:37)     @ normalizeresponsehelper (../assets/vendor.js:107520:39) 

why asserted? can't mix , match json api adapter non-conforming one? understand there problems if models try intreact (eg. has-one/belongs-to etc relationships) there no such thing. i'm trying add new model not backed back-end (json-api conforming) rest api.

ember: 2.7.2
embed data: 2.7.0

first import wrong!

its not

import lsserializer 'ember-localstorage-adapter'; 

but

import {lsserializer} 'ember-localstorage-adapter'; 

this because of exports in ember-localstorage-adapter:

import lsadapter 'ember-localstorage-adapter/adapters/ls-adapter'; import lsserializer 'ember-localstorage-adapter/serializers/ls-serializer';  export {   lsadapter,   lsserializer };  export default lsadapter; 

with import lsserializer 'ember-localstorage-adapter'; import default export wich not serializer.

next need understand ember-data internally works jsonapi documents. function of serializer serialize whatever adapter fetching jsonapi. defined store , ember-data itself. see api specification.

not lets see code doing:

serializers/widget.js import lsserializer 'ember-localstorage-adapter';  export default lsserializer.extend({     normalizeresponse: function(store, modelclass, payload, id, requesttype) {         return payload;     } }); 

you returning adapter implement normalizeresponse function. makes valid serializer, doing nothing! directly return responded adapter, seems not valid jsonapi. thats why error occurs.