Question

I have a line like this:

<%= f.input :state_id, :input_html => {:value => (policy_address.state.name rescue nil)}, :required => true, :collection => states.map {|s| [ s.name, s.id] }, :include_blank => 'Please select'%>

I want to exclude a value from the states.map collection. I thought that this would work but it doesn’t:

<%= f.input :state_id, :input_html => {:value => (policy_address.state.name rescue nil)}, :required => true, :collection => states.map {|s| [ s.name, s.id] unless s.name == "excluded_state" }, :include_blank => 'Please select'%>

I put in unless s.name == "excluded_state, but, again, it’s not working:

What am I doing wrong?

Answer 1

map doesn’t allow to skip values. You have to reject unwanted elements first.

states.reject { |s| s.name == "excluded_state" }.map { |s| [s.name, s.id] }

Another (dirtier) solution is to return nil for excluded elements and use Array#compact on the resulting array to remove those nil elements:

states.map { |s| s.name == "excluded_state" ? nil : [s.name, s.id] }.compact