How to compare two JSON objects? #1007

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1. nlohmann commented on Mar 11, 2018

   

   nlohmann

   on Mar 11, 2018

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   The items() function replaces the deprecated iterator_wrapper.

   Can you provide an example so I can understand what you mean with "compare indexes"?
2. nlohmann

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   state: needs more infothe author of the issue needs to provide more detailsthe author of the issue needs to provide more details

   on Mar 11, 2018
3. zkelo commented on Mar 11, 2018

   

   zkelo

   on Mar 11, 2018

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   For example, i have this JSON string and parsing it. Let this JSON will be a Settings. Settings string I'm getting from file.
   { "Value1": 4, "Value3": "Hello" }

   And this string will be DefaultSettings.
   { "Value1": 4, "Value2": true, "Value3": "Hello" }

   This string I'm parsing into objects. In DefaultSettings i have three values, but in Settings only two. And when I will use Settings["Value2"] it will generate an exception. For fix it, I want to compare indexes and their values after parsing. Now I'll try to use items().
4. nlohmann commented on Mar 11, 2018

   

   nlohmann

   on Mar 11, 2018

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   The update function could be handy for you:

   // start with a copy of the default settings
   json s = DefaultSettings;
   // overwrite all default settings with those given in Settings
   s.update(Settings);

   Assume Settings is {"Value1": 100} and DefaultSettings like above. Then the result would be s = {"Value1": 100, "Value2": true, "Value3": "Hello" }.
5. nlohmann

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   solution: proposed fixa fix for the issue has been proposed and waits for confirmationa fix for the issue has been proposed and waits for confirmation

   and removed

   state: needs more infothe author of the issue needs to provide more detailsthe author of the issue needs to provide more details

   on Mar 11, 2018
6. zkelo commented on Mar 11, 2018

   

   zkelo

   on Mar 11, 2018

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   Big thanks.
7. zkelo

   closed this as completedon Mar 11, 2018
8. pboettch commented on Mar 11, 2018

   

   pboettch

   on Mar 11, 2018

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   @zkelo FWIW: for a larger use cases you might consider using JSON-schemas for validating JSON objects.

   👍React with 👍4Reacted by Eric Magnuson, Adrien M, Alex and Azeem