fix: custom field name collides with internal field name

[julianvogels]

New Pull Request Checklist

• I am not disclosing a vulnerability.
• I am creating this PR in reference to issue #7130.

Issue Description

This PR doesn't fix the issue, but adds a failing test which demonstrates the problem.

The test

1. saves a test object
2. sets an invalid field length to 1
3. saves the test object again
4. beforeSave hook unsets the invalid field length

Expected result:
The beforeSave hook succeeds to unset the invalid field.

Actual result:
An error 105 – Invalid field name for update: length is thrown before the beforeSave hook is executed, and no unset operation is done.

Related issue: #7130

Approach

The test was added in the CloudCode.spec.js file.

[dplewis]

Thanks for the test. I can do a fix for this since I introduced it. I also have a few more fields that will be reserved.

[mtrezza]

⚠️ Important change for merging PRs from Parse Server 5.0 onwards!

We are planning to release the first beta version of Parse Server 5.0 in October 2021.

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[pausenabre]

@dplewis is there any update in relation to this issue? or any planned development on this?

[mtrezza]

@pausenabre I assume this is a larger effort, see the discussion in the related issue. The issue is still open.