Owens
1
Hello,
I have a simple query using is_nil/1
, but it’s not working and I’m getting the error:
comparison with nil is forbidden as it is unsafe. If you want to check if a value is nil, use is_nil/1 instead
Here’s the query
cohort_chat_query = from c in Chat,
where: c.cohort_id == ^attrs["cohort_id"] and is_nil(c.team_id)
Any help would be great, thanks.
1 Like
Hi, just a guess, maybe you need parentheses
where: (c.cohort_id == ^attrs["cohort_id"]) and is_nil(c.team_id)
hth, (Merry Xmas!)
Owens
3
Thanks for the guess and holiday wishes!
I just tried that but still not working. 
Oddly, this this line works in iex console but not in my dev environment.
Owens
4
Ok, found the solution.
The issue was attrs["cohort_id"]
was nil. I had to change it to attrs.cohort_id
.
The is_nil(c.team_id)
part was working fine.
2 Likes