How to convert array of ActiveRecord models to CSV?

Question

I got an array of ActiveRecord models that I wish to convert to a CSV. I tried researching gems like FasterCSV, but they just seem to work with strings and arrays, not Activ

Answer 1

One can also utilize the sql engine for this. E.g. for sqlite3:

cat << EOF > lib/tasks/export-submissions.sql
.mode      csv
.separator ',' "\n"
.header    on


.once "submissions.csv"

select
  *
from submissions
;
EOF

sqlite3 -init lib/tasks/export-submissions.sql db/development.sqlite3 .exit

If you are on CentOS 7 -- it ships with sqlite released in 2013. That version did not know separator and once yet. So you might need to download the latest binary from the web-site: https://sqlite.org/download.html install it locally, and use the full path to the local installation:

~/.local/bin/sqlite3 -init lib/tasks/export-submissions.sql db/development.sqlite3 .exit