Method: ActionView::Helpers::FormOptionsHelper#options_from_collection_for_select

Defined in:
lib/action_view/helpers/form_options_helper.rb

#options_from_collection_for_select(collection, value_method, text_method, selected = nil) ⇒ Object

Returns a string of option tags that have been compiled by iterating over the collection and assigning the the result of a call to the value_method as the option value and the text_method as the option text. Example:

options_from_collection_for_select(@people, 'id', 'name')

This will output the same HTML as if you did this:

<option value="#{person.id}">#{person.name}</option>

This is more often than not used inside a #select_tag like this example:

select_tag 'person', options_from_collection_for_select(@people, 'id', 'name')

If selected is specified as a value or array of values, the element(s) returning a match on value_method will be selected option tag(s).

If selected is specified as a Proc, those members of the collection that return true for the anonymous function are the selected values.

selected can also be a hash, specifying both :selected and/or :disabled values as required.

Be sure to specify the same class as the value_method when specifying selected or disabled options. Failure to do this will produce undesired results. Example:

options_from_collection_for_select(@people, 'id', 'name', '1')

Will not select a person with the id of 1 because 1 (an Integer) is not the same as ‘1’ (a string)

options_from_collection_for_select(@people, 'id', 'name', 1)

should produce the desired results.



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# File 'lib/action_view/helpers/form_options_helper.rb', line 339

def options_from_collection_for_select(collection, value_method, text_method, selected = nil)
  options = collection.map do |element|
    [element.send(text_method), element.send(value_method)]
  end
  selected, disabled = extract_selected_and_disabled(selected)
  select_deselect = {}
  select_deselect[:selected] = extract_values_from_collection(collection, value_method, selected)
  select_deselect[:disabled] = extract_values_from_collection(collection, value_method, disabled)

  options_for_select(options, select_deselect)
end