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How json sort values

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  • F Offline
    F Offline
    firsnur96
    wrote on last edited by
    #1

    Hi everyone.
    I have a json file and i read some values on there.
    My question is, how qt sort the json elements?
    In alphabetic order or something else?
    And can we change it, because the issues getting harder for me for the sorting value

    jsulmJ 1 Reply Last reply
    0
    • F firsnur96

      Hi everyone.
      I have a json file and i read some values on there.
      My question is, how qt sort the json elements?
      In alphabetic order or something else?
      And can we change it, because the issues getting harder for me for the sorting value

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #2

      @firsnur96 There is no sort order in JSON. Array elements come in the order they were added to the array. There is no sort order for elements in an JSON object. If you need a specific sort order you have to do that on your side.

      https://forum.qt.io/topic/113070/qt-code-of-conduct

      F 1 Reply Last reply
      2
      • jsulmJ jsulm

        @firsnur96 There is no sort order in JSON. Array elements come in the order they were added to the array. There is no sort order for elements in an JSON object. If you need a specific sort order you have to do that on your side.

        F Offline
        F Offline
        firsnur96
        wrote on last edited by
        #3

        @jsulm You might be right, but when i right elements in my array like
        Cherry
        Apple
        Banana

        ıt sorts them
        apple
        banana
        cherry

        jsulmJ JonBJ 2 Replies Last reply
        0
        • F firsnur96

          @jsulm You might be right, but when i right elements in my array like
          Cherry
          Apple
          Banana

          ıt sorts them
          apple
          banana
          cherry

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #4

          @firsnur96 Please show your JSON and how you read it.

          https://forum.qt.io/topic/113070/qt-code-of-conduct

          1 Reply Last reply
          1
          • F firsnur96

            @jsulm You might be right, but when i right elements in my array like
            Cherry
            Apple
            Banana

            ıt sorts them
            apple
            banana
            cherry

            JonBJ Offline
            JonBJ Offline
            JonB
            wrote on last edited by
            #5

            @firsnur96
            Show your code for exactly what you mean by "array". As @jsulm wrote JSON should output true arrays in array order.

            1 Reply Last reply
            1
            • J.HilkJ Offline
              J.HilkJ Offline
              J.Hilk
              Moderators
              wrote on last edited by
              #6

              Json is by definition unordered

              However, the QT implementation uses a QMap (IIRC). QMap alphabetically orders its keys, nothing you can do about it, but writing your own json writer


              Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


              Q: What's that?
              A: It's blue light.
              Q: What does it do?
              A: It turns blue.

              JonBJ 1 Reply Last reply
              1
              • J.HilkJ J.Hilk

                Json is by definition unordered

                However, the QT implementation uses a QMap (IIRC). QMap alphabetically orders its keys, nothing you can do about it, but writing your own json writer

                JonBJ Offline
                JonBJ Offline
                JonB
                wrote on last edited by JonB
                #7

                @J-Hilk
                I'm lost. If the OP is genuinely JSON-serializing an array, in C++ terms (or list in Python), there are no "keys", alphabetical or not. Only the integer indexes into the array. Which it will output to the JSON in array element order. So what are you talking about here for "array", and as I asked the OP to show code, there should be no QMap nor "cherry", "apple", "banana"?

                Or it's not an "array"....

                KroMignonK J.HilkJ 2 Replies Last reply
                0
                • JonBJ JonB

                  @J-Hilk
                  I'm lost. If the OP is genuinely JSON-serializing an array, in C++ terms (or list in Python), there are no "keys", alphabetical or not. Only the integer indexes into the array. Which it will output to the JSON in array element order. So what are you talking about here for "array", and as I asked the OP to show code, there should be no QMap nor "cherry", "apple", "banana"?

                  Or it's not an "array"....

                  KroMignonK Offline
                  KroMignonK Offline
                  KroMignon
                  wrote on last edited by
                  #8

                  @JonB said in How json sort values:

                  I'm lost. If the OP is genuinely JSON-serializing an array, in C++ terms (or list in Python), there are no "keys", alphabetical or not.

                  Of course there are keys in JSON, for example:

                  {
                     "index": 1,
                     "value": "test",
                     "parameters": ["x", "b", "c"']
                  }
                  

                  There are 3 keys: index, value and parameters.
                  Those will in a QMap, which means they are sorted.
                  But the value hold by key parameters will not be sorted, this is a list.

                  It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

                  JonBJ 1 Reply Last reply
                  2
                  • JonBJ JonB

                    @J-Hilk
                    I'm lost. If the OP is genuinely JSON-serializing an array, in C++ terms (or list in Python), there are no "keys", alphabetical or not. Only the integer indexes into the array. Which it will output to the JSON in array element order. So what are you talking about here for "array", and as I asked the OP to show code, there should be no QMap nor "cherry", "apple", "banana"?

                    Or it's not an "array"....

                    J.HilkJ Offline
                    J.HilkJ Offline
                    J.Hilk
                    Moderators
                    wrote on last edited by
                    #9

                    @JonB I was refering to the opening post:

                    I have a json file and i read some values on there.
                    My question is, how qt sort the json elements?

                    this is ambiguous enough to mean anything I may guess it to the qt way of alphabetically sorting keys.

                    the 2nd post

                    Cherry
                    Apple
                    Banana

                    ıt sorts them
                    apple
                    banana
                    cherry

                    doesn't add anything of value, those are neither lists nor arrays in any language/storage format that I know of


                    Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                    Q: What's that?
                    A: It's blue light.
                    Q: What does it do?
                    A: It turns blue.

                    1 Reply Last reply
                    0
                    • KroMignonK KroMignon

                      @JonB said in How json sort values:

                      I'm lost. If the OP is genuinely JSON-serializing an array, in C++ terms (or list in Python), there are no "keys", alphabetical or not.

                      Of course there are keys in JSON, for example:

                      {
                         "index": 1,
                         "value": "test",
                         "parameters": ["x", "b", "c"']
                      }
                      

                      There are 3 keys: index, value and parameters.
                      Those will in a QMap, which means they are sorted.
                      But the value hold by key parameters will not be sorted, this is a list.

                      JonBJ Offline
                      JonBJ Offline
                      JonB
                      wrote on last edited by
                      #10

                      @KroMignon said in How json sort values:

                      @JonB said in How json sort values:

                      I'm lost. If the OP is genuinely JSON-serializing an array, in C++ terms (or list in Python), there are no "keys", alphabetical or not.

                      Of course there are keys in JSON, for example:

                      Did you read my answer? I italicised array. What you show with { ... } is not an array, it's an object. You do have one one array value there, ["x", "b", "c"']. And that should be serialized just as shown, there are no keys here.

                      There are 3 keys: index, value and parameters.

                      Those will in a QMap, which means they are sorted.

                      Indeed. And they do not form an array or list.

                      But the value hold by key parameters will not be sorted, this is a list.

                      Indeed. Which is what I & @jsulm said:

                      There is no sort order in JSON. Array elements come in the order they were added to the array.

                      KroMignonK 1 Reply Last reply
                      0
                      • JonBJ JonB

                        @KroMignon said in How json sort values:

                        @JonB said in How json sort values:

                        I'm lost. If the OP is genuinely JSON-serializing an array, in C++ terms (or list in Python), there are no "keys", alphabetical or not.

                        Of course there are keys in JSON, for example:

                        Did you read my answer? I italicised array. What you show with { ... } is not an array, it's an object. You do have one one array value there, ["x", "b", "c"']. And that should be serialized just as shown, there are no keys here.

                        There are 3 keys: index, value and parameters.

                        Those will in a QMap, which means they are sorted.

                        Indeed. And they do not form an array or list.

                        But the value hold by key parameters will not be sorted, this is a list.

                        Indeed. Which is what I & @jsulm said:

                        There is no sort order in JSON. Array elements come in the order they were added to the array.

                        KroMignonK Offline
                        KroMignonK Offline
                        KroMignon
                        wrote on last edited by KroMignon
                        #11

                        @JonB said in How json sort values:

                        Did you read my answer? I italicised array. What you show with { ... } is not an array, it's an object. You do have one one array value there, ["x", "b", "c"']. And that should be serialized just as shown, there are no keys here.

                        I apologies, I am not a native speaker.
                        I did read your answer, but it seems I did not right understand it.
                        I know that {} is for objects and [] for arrays.
                        I also know that many people mixup keys and values when speaking about JSON, and I am pretty sure this is the root failure here for this thread.

                        It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

                        JonBJ 1 Reply Last reply
                        2
                        • KroMignonK KroMignon

                          @JonB said in How json sort values:

                          Did you read my answer? I italicised array. What you show with { ... } is not an array, it's an object. You do have one one array value there, ["x", "b", "c"']. And that should be serialized just as shown, there are no keys here.

                          I apologies, I am not a native speaker.
                          I did read your answer, but it seems I did not right understand it.
                          I know that {} is for objects and [] for arrays.
                          I also know that many people mixup keys and values when speaking about JSON, and I am pretty sure this is the root failure here for this thread.

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by
                          #12

                          @KroMignon
                          I think you are right. I asked the OP for clarification of the code, because "sorting" of "keys" with values "apple", "banana" & "cherry" refers to a "map" or "object" but not to an "array".

                          F 1 Reply Last reply
                          0
                          • JonBJ JonB

                            @KroMignon
                            I think you are right. I asked the OP for clarification of the code, because "sorting" of "keys" with values "apple", "banana" & "cherry" refers to a "map" or "object" but not to an "array".

                            F Offline
                            F Offline
                            firsnur96
                            wrote on last edited by
                            #13

                            @JonB

                                 "Fruits":[
                                    {
                                       "0":[
                                          "0",
                                          "Cherry",
                                          "---"
                                       ],
                                       "1":[
                                          "1",
                                          "Apple",
                                          "---"
                                       ],
                                       "2":[
                                          "2",
                                          "Banana",
                                          "---"
                                       ]
                            

                            Here is a part of my json file, there should me missing paranthesis etc. sorry for it. Im trying to understand all answers

                            jsulmJ JonBJ 2 Replies Last reply
                            0
                            • F firsnur96

                              @JonB

                                   "Fruits":[
                                      {
                                         "0":[
                                            "0",
                                            "Cherry",
                                            "---"
                                         ],
                                         "1":[
                                            "1",
                                            "Apple",
                                            "---"
                                         ],
                                         "2":[
                                            "2",
                                            "Banana",
                                            "---"
                                         ]
                              

                              Here is a part of my json file, there should me missing paranthesis etc. sorry for it. Im trying to understand all answers

                              jsulmJ Offline
                              jsulmJ Offline
                              jsulm
                              Lifetime Qt Champion
                              wrote on last edited by
                              #14

                              @firsnur96 See the answer from @J-Hilk

                              https://forum.qt.io/topic/113070/qt-code-of-conduct

                              1 Reply Last reply
                              0
                              • F firsnur96

                                @JonB

                                     "Fruits":[
                                        {
                                           "0":[
                                              "0",
                                              "Cherry",
                                              "---"
                                           ],
                                           "1":[
                                              "1",
                                              "Apple",
                                              "---"
                                           ],
                                           "2":[
                                              "2",
                                              "Banana",
                                              "---"
                                           ]
                                

                                Here is a part of my json file, there should me missing paranthesis etc. sorry for it. Im trying to understand all answers

                                JonBJ Offline
                                JonBJ Offline
                                JonB
                                wrote on last edited by JonB
                                #15

                                @firsnur96
                                I don't know whether what you have shown is what you have, what you want, what you don't get, or whatever.

                                Each item like

                                [
                                              "0",
                                              "Cherry",
                                              "---"
                                           ],
                                

                                is itself an array/list. But the outer element like

                                        {
                                           "0": ...
                                           "1": ...
                                
                                

                                is an object with keys like "0", "1".

                                I don't know where your

                                ıt sorts them

                                apple

                                banana

                                cherry

                                comes from.

                                Maybe some structure in C++ is involved? A QMap?? I don't understand what exactly is "missorting" where.

                                1 Reply Last reply
                                0

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