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Unable to serialize some of Unity's formats to Json with EditorJsonUtility.FromJsonOverwrite



Steps to reproduce:
1. Download and open the attached project
2. Open Window-->Editor Tests Runner
3. Click "Run All"

Expected result: all tests run succeed
Actual result: some tests fail, indicating that Unity is unable to serialize those formats as Json

Reproduced on 5.5.0b1, 5.5.0b9, 5.6.0a1 18e0ef8e6d09
Due to updated libraries, method unavailable in 5.4 and below

Note: serializations are written in "ContentPipeline" and called in "SerializationTests"

Comments (2)

  1. tonycoculuzzi

    Jan 08, 2017 01:55

    Sorry for the double post, but below is the text from my bug report on the same issue:

    UnityEngine.JsonUtility.ToJson does not properly store data for UnityEngine.Object references. When storing a reference, and adding another file of the same type to the project, the reference will be broken next time the editor is opened.

    For exmaple: Store a reference to a Material. Add another Material to the project. Close and reopen the Unity project. The reference is now broken.

    After comparing the YAML and JSON outputs when serializing an object, the YAML output seems to store a "fileID", a "guid", and a "type" value, for a UnityEngine.Object. However, the JSON output only seems to store an "instanceID" value, which is a value that seems to be unique every time the application (or Unity) runs

  2. tonycoculuzzi

    Jan 08, 2017 01:53

    Something to take into consideration: This GREATLY affects tool/asset store addon development.

    Note: reproduced on 5.5.0f1

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