serde_json::Value depict Strings incorrect

help
1

Why does serde_json::Value puts a String into a depiction like String("Some string") and not like "Some string" or a string literal like Some string? Is there a way to prevent this except using structs?

Object {
        "apktool_out/lib/arm64-v8a/libqml_QtQuick_Controls_Fusion_impl_qtquickcontrols2fusionstyleimplplugin_arm64-v8a.so": Array [
            String("QColor"),
            String("QML.AddedInVersion"),
            String("QJSManagedValue"),
            String("highlight"),
[...]
2

You seem to be using the debug representation, and serde_json:: Value is an enum, which means that the enum variant will be printed out.

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3

Ah ok, so I just have to change the representation

4

Yes, you can use serde_json::to_string for that, or one of the other functions here.

5

serde_json::Value implements Display, so there's no need to serialize it.

4 Likes
6

Presentation of the debug format is not guaranteed. If you want data printed it a particular way, you have to implement it yourself.

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7

or just use Display? or use an existing crate that implements the printing logic?

generally, telling someone to implement json serialization manually is bad advice.

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8

I'm quite certain this is not what kornel suggested. Rather, changing the implementation of Debug in a way that changes the output is generally not considered a breaking change, whereas changing Display in that way is (at least as far as I remember, that is the policy of the standard library, I don't think this was part of the API evolution RFC). So you shouldn't use the Debug output for any data processing beyond debugging.

9

Changing Display in std is sometimes considered breaking, but sometimes isn't. There are some practical limits depending on how hard the ecosystem relies on a certain output, of course.

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10

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