collection select out of a constant in rails

Question

There is a constant called ENVIRONMENTS

validates :environment, inclusion: ENVIRONMENTS

with these associated constants and strings

ENVIRONMENT_INTERNAL="internal"
ENVIRONMENT_STAGING="staging"
ENVIRONMENT_PRODUCTION="production"
ENVIRONMENTS=[ENVIRONMENT_INTERNAL,ENVIRONMENT_STAGING,ENVIRONMENT_PRODUCTION]

I am trying to build a collection select which shows the strings related to the constants. How do I do it? This is how I have tried to do it

  =f.input :envrionment, as: :select, collection: [ENVIRONMENTS]

Answer 1

I had to access initialise the constant via the model;

  =f.select :environment, Deployment::ENVIRONMENTS, include_blank: 'Select'

this link proved useful here

Answer 2

f.select might come in handy here, as I have not used more of collection_select

<%= f.select 'server_id', ENVIRONMENTS, {:include_blank => "Select"} %>

value would be name as the selected entity

An ex:

<option value="internal">internal</option>