ApplicationModel.ts

import DS from 'ember-data';
import ModelMixin from 'ember-data-extensions/mixins/model';
import { memoize, startCase } from 'lodash-es';
import { get, set } from '@ember/object';

export default class ApplicationModel extends DS.Model.extend(ModelMixin).reopenClass({
    attributeLabels: memoize(
        function (this: ApplicationModel, store: any): object {
            const labelMap = {
                self: this.modelViewName()
            };

            this.eachRelationship((name: string, rel: any) => labelMap[name] = store.modelFor(rel.type).modelViewName());
            this.eachAttribute((name: string) => labelMap[name] = startCase(name));

            return Object.assign(labelMap, this.overriddenAttributeLabels(store));
        }, function (this: ApplicationModel): string {
            return this.modelName;
        }
    ),

    modelViewName: memoize(
        function (this: ApplicationModel): string {
            return this.overriddenModelViewName() || startCase(this.modelName);
        }, function (this: ApplicationModel): string {
            return this.modelName;
        }
    ),

    overriddenModelViewName: (): string => { return ''; },
    overriddenAttributeLabels: (_store: any): object => { return {}; }
}) {
    save(this: ApplicationModel, options: object) {
        const saveOpts = options ? options : { resetRelations: false };
        return this._super(saveOpts);
    };

    setDefaults(this: ApplicationModel, attrs: string[]) {
        const defaultRecord = get(this, 'store').createRecord(this.constructor.modelName);
        if (attrs) {
            attrs.forEach((attr) => set(this, attr, defaultRecord.get(attr)));
        } else {
            this.eachAttribute((attr: string) => set(this, attr, defaultRecord.get(attr)));
        }
        defaultRecord.deleteRecord();
        return this;
    };

    serializeWithRelationships(this: ApplicationModel, relationships: object) {
        return this._internalModel.createSnapshot({ adapterOptions: { relationships } }).serialize();
    };
};