如果 object 不存在，則使用 jq 在每個 object 中插入一個鍵值對

Question

我正在嘗試在 JSON 文件的每一行中添加一個特定的關鍵字，如果它不存在的話。

我的初始文件：

[{"type": "STRING", "name": "Article"},
{"type": "STRING", "name": "Sellable_UOM"},
{"type": "STRING", "name": "PriceFamilyCode"},
{"type": "STRING", "name": "PriceFamilyDescription"},
{"type": "STRING", "name": "SalesDistrict"},
{"type": "DATE", "name": "FiscalWeekendDate"},
{"type": "STRING", "mode": "REPEATED", "name": "export_sql"},
{"type": "STRING", "mode": "REPEATED", "name": "post_sql"}]

預期 output：

[{"type": "STRING", "mode": "NULLABLE", "name": "Article"},
{"type": "STRING", "mode": "NULLABLE", "name": "Sellable_UOM"},
{"type": "STRING", "mode": "NULLABLE", "name": "PriceFamilyCode"},
{"type": "STRING", "mode": "NULLABLE", "name": "PriceFamilyDescription"},
{"type": "STRING", "mode": "NULLABLE", "name": "SalesDistrict"},
{"type": "DATE", "mode": "NULLABLE", "name": "FiscalWeekendDate"},
{"type": "STRING", "mode": "REPEATED", "name": "export_sql"},
{"type": "STRING", "mode": "REPEATED", "name": "post_sql"}]

要求：如果該行包含模式值，則將其插入為“模式”：“NULLABLE”在類型和名稱屬性之間。

我想要達到的最終結果是從上面預期的 output 中獲取字段及其相應的日期類型和模式，如下所示。

最后結果：

    Article,STRING,NULLABLE 
    Sellable_UOM,STRING,NULLABLE
    PriceFamilyCode,STRING,NULLABLE
    PriceFamilyDescription,STRING,NULLABLE
    SalesDistrict,STRING,NULLABLE
    FiscalWeekendDate,DATE,NULLABLE
    export_sql,STRING,REPEATED
    post_sql,STRING,REPEATED

我試圖實現的命令來自預期的 output json 是，

jq -r '.[] |[ .name, .type, .mode]|@csv'  file1.json | sed s/'"'//g

Answer 1

下面的程序通過插入mode: "NULLABLE"對在每個沒有mode鍵的 object 的type和name鍵之間。

map(select(has("mode") | not) |= {type, mode: "NULLABLE", name})

但是，如果這里的目的是將輸入 JSON 轉換為 CSV，我認為不需要中間結構。 假設mode不存在或非空值，則可使用備用運算符進行直接轉換，如下所示。

.[] | [.type, .mode // "NULLABLE", .name] | @csv