Comma Delinated string, of Ids, from Array of Objects. RoR

Question

Why doesn't this work?

I have an array of Objects, one of the attributes is the db id. I can make the array like so.

qc_parts.map!{|a| a.id}

However when I want to just make it a string. With

qc_parts.map!{|a| a.id}.join(",")

I only get an array out. I've also tried .to_s & .to_a Any idea why this would be happening?

Mark · Accepted Answer · 2010-08-10 21:03:44Z

2

qc_parts.map!{|a| a.id}.join(",") will return a string, but it will not to put that value into the variable qc_parts. To do that you have to do

qc_parts = qc_parts.map{|a| a.id}.join(",")

If I've misunderstood, and you actually are seeing the join method return an array, then something strange is going on.

answered Aug 10, 2010 at 21:03

Mark

5,62936 silver badges29 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1