@bigtest/mirage/tests/integration/orm/has-many/10-many-to-many-polymorphic/delete-test.js

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import Helper, { states } from './_helper';
import { module, test } from 'qunit';

module('Integration | ORM | Has Many | Many-to-many Polymorphic | delete', {
  beforeEach() {
    this.helper = new Helper();
  }
});

states.forEach((state) => {
  test(`deleting children updates the parent's foreign key for a ${state}`, function(assert) {
    let [ user, posts ] = this.helper[state]();

    if (posts && posts.length) {
      posts.forEach(p => p.destroy());
      user.reload();
    }

    assert.equal(user.commentables.length, 0);
    assert.equal(user.commentableIds.length, 0);
  });
});