jq getting multiple fields from same query - linux

Question

I have a json of this type:
{
"_index": "indexeer",
"_type": "_doc",
"_id": "3233233233",
"_score": 1,
"_source": {
"Bibtex": {
"Article": {
"AuthorList": [
{
"Affiliation": {
"Affiliation": "Title content, Hematology and Hepatology Honorary Fellow, Honorary Member, American Society. xxxyyy#hotmail.com."
}
}
]
}
}
}
}
I get the Affiliation using jq like so:
jq -r '._source.Bibtex.Article.AuthorList[]? | .Affiliation.Affiliation | .[0:rindex(" Electronic address:")]' results.json
It works great, and gives me excatly the affiliations I need.
However, I now need the id field aswell and produce a csv like so:
"3233233233", "Title content, Hematology and Hepatology Honorary Fellow, Honorary Member, American Society"
I am able to get the ID seperately, easily like so:
jq -r '._id' results.json
but, how do I combine the two queries to produce a single output consisting of id and affiliation?
Essentially I want to combine the two queries.

Answer 1

Use [] to construct an array from your two elements and #csv to convert to CSV:
jq -r '[
._id,
._source.Bibtex.Article.AuthorList[]?.Affiliation.Affiliation[:rindex(" Electronic address:")]
] | #csv'
Output:
"3233233233","Title content, Hematology and Hepatology Honorary Fellow, Honorary Member, American Society. xxxyyy#hotmail.com."
Multiple authors will be added as columns to your CSV.
It's worth nothing that jq allows you to concatenate multiple arrays into a single one. Concatenating streams produces the cartesian product, e.g. [1]+[2] produces [1,2] and [1]+([2],[3]) will produce [1,2][1,3] (a stream comprising two arrays). You can leverage this fact to produce multiple output lines without capturing the id in a variable first:
[._id]
+ (._source.Bibtex.Article.AuthorList[]? | [ .Affiliation.Affiliation[0:rindex(" Electronic address:")] ])
| #csv

Answer 2

Save the id as a variable using ._id as $id, then you can use $id where ever you like:
._id as $id | ._source.Bibtex.Article.AuthorList[].Affiliation.Affiliation | [ $id, .[0:rindex(" Electronic address:")] ] | #csv
Output:
"3233233233","Title content, Hematology and Hepatology Honorary Fellow, Honorary Member, American Society. xxxyyy#hotmail.com."
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