Unset a property while updating

[oprypkhantc]

Issue Summary

Given a created entity with a non-null optional property, there seems to be no way to update the property to be null. It gets encoded as an empty string and Twilio API doesn't unset the value. Returned entity still contains the previously set property value.

Steps to Reproduce

1. Create an entity with an optional parameter filled
2. Attempt to update it, passing null as parameter's value

Code Snippet

$conversation = $client->conversations->conversations->create(['friendlyName' => 'test']);
$conversation = $conversation->update(['friendlyName' => null]);

// Fails!
assert($conversation->friendlyName === null);

POST https://conversations.twilio.com/v1/Services/IS11111111ac44e5e9b52c2b010f8ea3a/Conversations/threads_2259
Authorization: Basic ****
Accept-Charset: utf-8
Content-Type: application/x-www-form-urlencoded
Accept: application/json

FriendlyName=

results in

{
    "unique_name": "threads_2259",
    "date_updated": "2021-12-07T18:00:34Z",
    "friendly_name": "test",
    "timers": {},
    "account_sid": "ACa3d5c6a580aea4fa5b8c0717f1076067",
    "url": "https://conversations.twilio.com/v1/Services/IS5083811b3ac44e5e9b52c2b010f8ea3a/Conversations/CH5e1f6d3ef2b446a6b2d285315f8805e0",
    "state": "active",
    "date_created": "2021-12-07T16:28:34Z",
    "messaging_service_sid": "MGd1f04aaf5b520358de5367defc56b317",
    "sid": "CH5e1f6d3ef2b446a6b2d285315f8805e0",
    "attributes": "{\"id\":3953}",
    "bindings": null,
    "chat_service_sid": "IS5083811b3ac44e5e9b52c2b010f8ea3a",
    "links": {
        "participants": "https://conversations.twilio.com/v1/Services/IS5083811b3ac44e5e9b52c2b010f8ea3a/Conversations/CH5e1f6d3ef2b446a6b2d285315f8805e0/Participants",
        "messages": "https://conversations.twilio.com/v1/Services/IS5083811b3ac44e5e9b52c2b010f8ea3a/Conversations/CH5e1f6d3ef2b446a6b2d285315f8805e0/Messages",
        "webhooks": "https://conversations.twilio.com/v1/Services/IS5083811b3ac44e5e9b52c2b010f8ea3a/Conversations/CH5e1f6d3ef2b446a6b2d285315f8805e0/Webhooks"
    }
}

Technical details:

• twilio-php version: 6.31.1

[childish-sambino]

In order to properly debug this issue, please file a support ticket.