Question

如何做一件事：

  = f.input_field :age,
                  :collection => 18..60,
                  :id => 'age',
                  :selected => params[:age].blank? or "20"

上面没有工作。如果 no param 可用于该属性，我希望能够设置默认值。

任何聪明的方法来执行此操作！

编辑1：完整形式：

  = simple_form_for  :people,  :url => request.fullpath, :method => :get,  :html => { :class => 'form-search' } do |f|
    #container_search_small.form-search


      = f.input_field :age,
                      :collection => 18..60,
                      :id => 'age',
                      :selected => params[:people][:age_from] || "20"



      = f.submit "Go »"

Answer 1

您正在使用从您正在构建表单的对象中获取值的帮助程序。

因此，在您的控制器中，您应该预设对象上的值。

def some_action
  @people = People.new
  @people.age = params[:age] || 20
end

然后在表单中，删除:selected选项，它应该没问题。确保为@people构建表单：

= simple_form_for  @people,  :url => request.fullpath, :method => :get,  :html => { :class => 'form-search' } do |f|
  #container_search_small.form-search


    = f.input_field :age,
                  :collection => 18..60,
                  :id => 'age'



    = f.submit "Go »"

Rails 3：如果params [：something] .blank，则为text_field_tag默认值？

1 个答案: