fix: toJSON() repeats pending updates to nested keys

[mstniy]

New Pull Request Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am creating this PR in reference to an issue.

Issue Description

Fix #1452

Related issue: #1452

Approach

ParseObject.toJSON() no longer applies pending operations a second time. attributes takes care of them already.

TODOs before merging

• [x] Add tests
• [x] Add entry to changelog
• [ ] Add changes to documentation (guides, repository pages, in-code descriptions)

[parse-github-assistant[bot]]

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• ❌ Please link an issue that describes the reason for this pull request, otherwise your pull request will be closed. Make sure to write it as Closes: #123 in the PR description, so I can recognize it.

[mtrezza]

To fix the commit message check, could you please change the title to fix: <summary of bug>.

[dplewis]

@mstniy @mtrezza I think https://github.com/parse-community/Parse-SDK-JS/pull/1451 also fixes this issue. Can you have a look? I can't seem to get duplicate pending operations to appear with this new fix in place.

[mstniy]

@dplewis Strange that you cannot replicate it. I tested it with #1451 and the issue was still there.

Did you follow the steps in #1452?

[dplewis]

@mstniy Ok this looks good. Can you add the following integration test?

it('can set nested fields without repeating pending operations on toJSON', async () => {
    const a = new Parse.Object("MyObject");
    a.set('obj', {});
    await a.save();
    a.set('obj.a', 0);
    const json = a.toJSON();
    expect(json.obj).toEqual({ a: 0 });
    expect(json['obj.a']).toBeUndefined();
  });

[parse-github-assistant[bot]]

I will reformat the title to use the proper commit message syntax.

[mstniy]

@dplewis Added the test with small modifications

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (72bc9ac) to head (21bcaae). Report is 17 commits behind head on alpha.

Additional details and impacted files

@@             Coverage Diff             @@
##            alpha     #1453      +/-   ##
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+ Coverage   99.98%   100.00%   +0.01%     
===========================================
  Files          61        64       +3     
  Lines        6185      6205      +20     
  Branches     1499      1504       +5     
===========================================
+ Hits         6184      6205      +21     
+ Misses          1         0       -1     

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[parseplatformorg]

🎉 This change has been released in version 5.1.0-alpha.8

[parseplatformorg]

🎉 This change has been released in version 5.1.0-beta.1

[parseplatformorg]

🎉 This change has been released in version 5.1.0