How to merge multiple Json files in folder in certain order - json

Question

I have several JSON files in a folder and I want to combine them in a single one following certain order given in order.json
I´ve tested the code below that merges all the files but in alphabetical order based on file name.
jq -s . *.json > Merged.json
This is the file Shoes.json
{ "document": { "product": "Shoes", "info": [ { "day": "1", "month": "1", "entry": "Some text about Shoes for day 1 and month 1", "code": "AJKD" }, { "day": "2", "month": "1", "entry": "Some text about Shoes for day 2 and month 1", "code": "KKGIR" } ] } }
This is the file Watches.json
{ "document": { "product": "Watches", "info": [ { "day": "2", "month": "3", "entry": "Some text about Watches for day 2 and month 3", "code": "PEWQ" } ] } }
This is the file Accesories.json
{ "document": { "product": "Accesories", "info": [ { "day": "7", "month": "2", "entry": "Some text about Accesories for day 7 and month 2", "code": "UYAAC" } ] } }
This is the file that gives the order I want to get in output order.json
{
"order":{
"product 1":"Watches",
"product 2":"Accesories",
"product 3":"Shoes"
}
}
And the output file I´d like to get would be like this Merged.json:
{
"document":[
{
"product":"Watches",
"info":[
{
"day":"2",
"month":"3",
"entry":"Some text about Watches for day 2 and month 3",
"code":"PEWQ"
}
]
},
{
"product":"Accesories",
"info":[
{
"day":"7",
"month":"2",
"entry":"Some text about Accesories for day 7 and month 2",
"code":"UYAAC"
}
]
},
{
"product":"Shoes",
"info":[
{
"day":"1",
"month":"1",
"entry":"Some text about Shoes for day 1 and month 1",
"code":"AJKD"
},
{
"day":"2",
"month":"1",
"entry":"Some text about Shoes for day 2 and month 1",
"code":"KKGIR"
}
]
}
]
}
Maybe someone could help me with this case.
Any help would be very appreciated.

Answer 1

Here's a solution that uses order.json to determine which files are to be read by jq:
jq -n '{documents: [inputs.document]}' $(jq -r '.order[] + ".json"' order.json)
The approach exemplified immediately above has many advantages, but the above line makes various assumptions that might not be warranted. For example, it assumes there are no spaces in any of the file names.
Robust handling of file names
The following assumes bash-ful functionality:
mapfile -t args < <(jq -r '.order[] + ".json"' order.json)
jq -n '{documents: [inputs.document]}' "${args[#]}"
If your bash does not have mapfile, you could set the bash variable as follows:
args=()
while read -r f; do
args+=("$f")
done < <(jq -r '.order[] + ".json"' order.json)

Answer 2

The following solution has the advantage of not requiring any shell-specific functionality and only requiring a single invocation of jq. It assumes you want to be able to handle arbitrarily many files, as determined by order.json. Amongst other assumptions is that in the pwd, we can use the pattern [A-Z]*.json to select the relevant "documents".
jq -n --argfile order order.json '
INDEX(inputs.document; .product) as $dict
| reduce $order.order[] as $product ([]; . + [$dict[$product]])
| {document: .}
' [A-Z]*.json
def INDEX
If your jq does not have INDEX/2, then it might be a good time to upgrade; alternatively, you could simply add (prepend) its def:
def INDEX(stream; idx_expr):
reduce stream as $row ({}; .[$row|idx_expr|tostring] = $row);