how do I get a count of an array based on a nested attribute?

Question

I have a user array with an invitations_attributes array inside of it. The invitations_attributes array has another array inside of it. Here is the structure:

"user"=>{"invitations_attributes"=>{"6"=>{"email"=>""}, "7"=>{"email"=>""}, "0"=>{"email"=>"[email protected]"}, "1"=>{"email"=>""}, "2"=>{"email"=>""}, "3"=>{"email"=>""}, "4"=>{"email"=>""}, "5"=>{"email"=>""}}}}

What I want to do is get a count of invitations_attributes where the email value is not blank. So in the above case, the count would be 1.

Dylan Markow · Accepted Answer · 2012-02-19 21:01:48Z

3

What you show is a nested hash, not an array. Given a user hash as you describe:

user["invitation_attributes"].count{ |key, value| value["email"].present? }

answered Feb 19, 2012 at 21:01

Dylan Markow

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3 Comments

Matthew Berman Over a year ago

this worked! can you explain why you put item[1] there? how come that is a variable?

Dylan Markow Over a year ago

I revised the answer. If you only pass in one argument to a block on a hash, it'll give you arrays, so the first one would have been ["6", {"email" => ""}], so the item at location 1 would be {"email" => ""}. However, the better way is to give two arguments, the key and value, and then you can just check the value.

Matthew Berman Over a year ago

hmmm...very interesting. I will have to review how this works but it worked great. thanks so much!

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