Serdes Does Not Work for Items in Object in Array

Describe the bug Serdes performs well on properties in an object. However, when the owning object is part of an array, then serialize is never called.

To Reproduce

1. git clone https://github.com/cdimascio/express-openapi-validator.git
2. npm run deps && npm i
3. cd express-openapi-validator/examples/7-response-date-serialization
4. npm start
5. GET http://localhost:3000/v1/date-time

The above works fine.

Let’s now modify the route in app.js to return an array of objects:

app.get('/v1/date-time', function (req, res, next) {
  res.json(
    // {
    //   id: 1,
    //   created_at: new Date(),
    // }
    [
      {
        id: 1,
        created_at: new Date(),
      }
    ]
  );
});

We’ll also modify the schema in api.yaml:

/date-time:
  get:
    responses:
      200:
        description: date-time handler
        content:
          application/json:
            schema:
#              type: object
#              properties:
#                created_at:
#                  type: string
#                  format: date-time
#                id:
#                  type: number
              type: array
              items:
                type: object
                properties:
                  created_at:
                    type: string
                    format: date-time
                  id:
                    type: number

Actual behavior

{
    "message": ".response[0].created_at should be string",
    "errors": [
        {
            "path": ".response[0].created_at",
            "message": "should be string",
            "errorCode": "type.openapi.validation"
        }
    ]
}

Expected behavior

[
    {
        "id": 1,
        "created_at": "2022-01-20T17:40:41.816Z"
    }
]

[Fabiencdp]

We are waiting for the approve of the repository owner

[cdimascio]

This is now available in v5.0.0