rails-从数组中检索某些值

Question

I am calling an api to get a response.

users = response.involved_users // here users is an array with everything, I only want the actual user numbers

Part of this response has an array.

The array can have one or more elements.

In each element, there are values of

@type = "start"
@value = "this value"
@user = "12345"

I don't know if these are stored as a hash in the elements or what.

I want to pull all the @user - user numbers in to an array.

So for every elemnent, add the user to an array.

so this line, user should be an array of users:

users = response.involved_users // do I need to do a map?

I tried this:

users = response.involved_users.map { |x| x[:user]

but got this:

NoMethodError - undefined method `[]' for #<Client::InvolvedUser:0x11691828>:

Answer 1

    #<Client::InvolvedUser:0x11691828>:

shows that x is an object of Class Client::InvolvedUser so an object's attribute should be called like this

    x.user

Try this

    users = response.involved_users.map { |x| x.user }