Pass list to the curl command in Shell - shell

Question

How can I pass a list of assignees to the curl command?
assignees=("user1","user2")
issue_response=$(curl \
-X POST \
-u :"$GH_TOKEN" \
-H "Accept: application/vnd.github.v3+json" \
"$GITHUB_API_ENDPOINT" \
-d '{"title": "'"$issue_title"'", "body": "'"$issue_subject"'", "labels":["failure"], "assignees":["'"$assignees"'"]}')
echo "$issue_response"
When I trace this POST request I found the following issue, it is not a valid list.
"assignees":["user1,user2"]
Ideally, it should be
"assignees":["user1","user2"]
Can someone point me how can I fix this?

Answer 1

The array assignment assignees=("user1","user2") is creating an array but placing both user1 and user2 into the first place via string concatenation with the , character.
In order to insert both items into the array you should put a space between them.
assignees=("user1" "user2")
Then you can access each item via ${assignees[0]} and ${assignees[1]}
To place the items dynamically into the curl command you have, you would have to build the string in a for loop like this:
assignees=("user1" "user2" "user3")
for i in "${!assignees[#]}"
do outputvar+="\"${assignees[$i]}\"" # Add assignee to variable
if [ $i -lt $(expr ${#assignees[#]} - 1) ] # Add comma unless it's the last item
then outputvar+=","
fi done
echo $outputvar