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permit()でJSONの複雑な形式を指定する手順

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元のJSON

 {
     "mark": 1,
     "offset": [23, 45],
     "Labels": [
         {
             "Name": "Rectangle",
             "Instances": [
                 {
                     "Box": {
                         "Width": 0.1,
                         "Height": 0.2
                     },
                     "Confidence": 99.9
                 }
             ]
         }
     ]
 }

配列の中がスカラー値のものは、値をすべて削除し、keyの前からvalue後のカンマ,の前までブレース{}で囲む

 {
     "mark": 1,
|    {"offset": []},
     "Labels": [
         {
             "Name": "Rectangle",
             "Instances": [
                 {
                     "Box": {
                         "Width": 0.1,
                         "Height": 0.2
                     },
                     "Confidence": 99.9
                 }
             ]
         }
     ]
 }

「連想配列」のvalueがスカラー値のものは、value部の記載を削除する(カンマ,は残す)

 {
|    "mark",
     {"offset": []},
     "Labels": [
         {
|            "Name",
             "Instances": [
                 {
                     "Box": {
|                        "Width",
|                        "Height"
                     },
|                    "Confidence"
                 }
             ]
         }
     ]
 }

keyの羅列しか残っていない「連想配列」は、元のブレース{}をブラケット[]に変え、keyの前からvalue後のカンマ,の前までブレース{}で囲む

 {
     "mark",
     {"offset": []},
     "Labels": [
         {
             "Name",
             "Instances": [
                 {
|                    {"Box": [
                         "Width",
                         "Height"
|                    ]},
                     "Confidence"
                 }
             ]
         }
     ]
 }

valueが「連想配列の配列」のものは、要素の2つ目以降を削除した後、ブレース{}をkeyの外側に持っていく

 {
     "mark",
     {"offset": []},
|    {"Labels": [
|
             "Name",
|            {"Instances": [
|
                     {"Box": [
                         "Width",
                         "Height"
                     ]},
                     "Confidence"
|
|            ]}
|
|    ]}
 }

最も外側の{}を削除し、permit()の引数にする

| params.permit(
     "mark",
     {"offset": []},
     {"Labels": [
             "Name",
             {"Instances": [
                     "Box": {
                         "Width",
                         "Height"
                     },
                     "Confidence"
             ]}
     ]}
| )

完成

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