Add relationships support to cypress.

[mshima]

Overview of the feature request

This is the only feature missing when comparing to protractor.

Protractor implementation selects last item from select and use it.
This is really easy to implement, but it doesn't follow best practices:
https://docs.cypress.io/guides/references/best-practices.html#Having-tests-rely-on-the-state-of-previous-tests
This approach causes problems like #13645.

To follow best practices I suggest the following approach:

describe('should create an instance of Entity', () => {
  let entity;
  let requiredOtherEntity;

  before(() => {
    // create a entity at the relationship entity:
    cy.request('POST', 'otherEntity', {requiredField: requiredValue}).then(response => {
      otherEntity = response.body;
    });
  })

  describe('should create an instance of Entity', () => {
    .
    .
    cy.get(`[data-cy="otherEntity"]`).select(requiredOtherEntity.id);
    entity = cy.get(entityCreateSaveButtonSelector).click({force: true}).;
    .
    .
  });
});

• It should work without fake data.
• It should work if the added otherEntity is not returned from the server as a option (pagination)
• It should work if otherEntity contains required fields/relationships.

Motivation for or Use Case

Related issues or PR

• Checking this box is mandatory (this is just to show you read everything)

[pascalgrimaud]

Big +1

[github-actions]

This issue is stale because it has been open 30 days with no activity.
Our core developers tend to be more verbose on denying. If there is no negative comment, possibly this feature will be accepted.
We are accepting PRs 😃.
Comment or this will be closed in 7 days

[pascalgrimaud]

Adding a bounty for this

[mshima]

Let's do this.

[mshima]

@pascalgrimaud bounty claimed https://opencollective.com/generator-jhipster/expenses/53725

[pascalgrimaud]

@mshima : approved