json - How to convert flat array of objects with "categories" and "subcategories" to tree with JQ? -


i have json array of objects groups , subgroups looks this:

[   {     "group name": "elevation",      "subgroup": "contours",      "name": "contours - labels"   },    {     "group name": "elevation",      "subgroup": "contours",      "name": "contours"   },    {     "group name": "elevation",      "subgroup": "cuttings",      "name": "cuttings"   },   {     "group name": "framework",      "subgroup": "reserves",      "name": "reserves"   },    {     "group name": "framework",      "subgroup": "indigenous reserves",      "name": "reserves"   },    {     "group name": "framework",      "subgroup": "land borders",      "name": "mainland"   } ]

i'd convert nested structure:

[ { type: group, name: elevation, items: [ ... ] } ]

how do in jq?

i'm not sure expected output exactly, done more efficiently. parameterizing grouping function, build trees in reusable fashion.

def regroup(keyfilter; itemfilter):     group_by(keyfilter) | map({         type: "group",         name: (.[0] | keyfilter),         items: itemfilter     })     ; regroup(."group name";     regroup(.subgroup;         map({ name })     ) )

this yields following results:

[   {     "type": "group",     "name": "elevation",     "items": [       {         "type": "group",         "name": "contours",         "items": [           { "name": "contours - labels" },           { "name": "contours" }         ]       },       {         "type": "group",         "name": "cuttings",         "items": [           { "name": "cuttings" }         ]       }     ]   },   {     "type": "group",     "name": "framework",     "items": [       {         "type": "group",         "name": "indigenous reserves",         "items": [           { "name": "reserves" }         ]       },       {         "type": "group",         "name": "land borders",         "items": [           { "name": "mainland" }         ]       },       {         "type": "group",         "name": "reserves",         "items": [           { "name": "reserves" }         ]       }     ]   } ]

functions powerful, should try utilize more. shows how powerful can be.


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