ruby-on-rails - form_for - select box rails 5

Cómo hacer que los carriles f.select seleccionados

Question

Es mi código:

<%= f.select :area, options_for_select([[''a'',''a''],[''b'',''b''],[''c'',''c'']]), {}, {:class => ''span3 controls controls-row''}, :selected => params[:area] %>

y el resultado es:

ArgumentError in Users#edit
Showing /home/airson/rails_projects/friends_of_local/app/views/users/edit.html.erb where line #17 raised:
wrong number of arguments (5 for 4)

por qué.....@@?

Answer 1

Debería pasar :selected opción :selected al método options_for_select , así:

<%= f.select :area, options_for_select([[''a'',''a''],[''b'',''b''],[''c'',''c'']], :selected => params[:area]), {}, { :class => ''span3 controls controls-row'' } %>

Answer 2

No es necesario utilizar :selected simplemente pase sus params[:area] solo a options_for_select como segundo argumento:

<%= f.select :area, 
    options_for_select([[''a'',''a''],[''b'',''b''],[''c'',''c'']], params[:area]),
    {}, { :class => ''span3 controls controls-row'' } %>

Se seleccionará el último valor de tus params[:area] .

Espero eso ayude ; )