ruby - Rails 4 fields_for update - default selection not working -

I am now working on Rail 4 project, and I have select in Field_for form for update

  & lt;% = f.fields_for: Content | Ingredient_fields |%> & Lt;% = ingredient_fields.text_area: Name% & gt; & Lt;% = ingredient_fields.select: Value%> & Lt;% = options_for_select ([['cheapest', 1], ['expensive', 2]],: value)%> & Lt;% end% & gt; & Lt;% = link_to_remove_fields 'Remove this component', f% & gt; & Lt;% end% & gt;  

but this update does not reflect the form : value attribute, which is already component object

(For example, if I have a component object with the expensive : value attribute, then select that object in the input