Method: ActionController::Parameters#extract_value

Defined in:

lib/action_controller/metal/strong_parameters.rb

#extract_value(key, delimiter: "_") ⇒ Object

Returns parameter value for the given key separated by delimiter.

params = ActionController::Parameters.new(id: "1_123", tags: "ruby,rails")
params.extract_value(:id) # => ["1", "123"]
params.extract_value(:tags, delimiter: ",") # => ["ruby", "rails"]
params.extract_value(:non_existent_key) # => nil

Note that if the given key‘s value contains blank elements, then the returned array will include empty strings.

params = ActionController::Parameters.new(tags: "ruby,rails,,web")
params.extract_value(:tags, delimiter: ",") # => ["ruby", "rails", "", "web"]

# File 'lib/action_controller/metal/strong_parameters.rb', line 1110

def extract_value(key, delimiter: "_")
  @parameters[key]&.split(delimiter, -1)
end