为什么轨道形式的选择标签不起作用？

Question

我有一个用户注册表:

<%= form_for(resource, :as => resource_name, 
        :url => registration_path(resource_name), 
        :id => "employer-form") do |f| %>
    <%= devise_error_messages! %>

    <p><%= f.email_field :email, :autofocus => true, :title => "Enter email", :value =>"Enter Email", :class =>"field" %></p>

    <p><%= f.text_field :profile_name, :autofocus => true, :title => "Enter Username", :value => "Enter Username", :class =>"field" %></p>


    <p class="clearfix">
       <%= f.password_field :password, :title => "Enter Password", :value => "Enter Password", :class => "field field-half" %>
       <%= f.password_field :password_confirmation, :title => "Retype Password", :value => "Retype Password", :class => "field field-half" %>     
    </p>

    <p class="clearfix"> 
       <%= f.text_field :first_name, :title => "Enter First Name", :value => "Enter First Name", :class => "field field-half" %>
       <%= f.text_field :last_name, :title => "Retype Last Name", :value => "Enter Last Name", :class => "field field-half" %>
    </p>

    <p class="clearfix">
       <div class="custom-select">
           <%= f.select_tag(:how_did_you_hear, options_for_select
               ([["Bing", :bing],["College Rep", :college_rep],
               ["Facebook", :facebook],["Google", :google],
               ["Pinterest", :pinterest],["Yahoo", :yahoo],
               ["Twitter", :twitter],["Other", :other]])) %>
       </div>  
    </p>

    <div><%= f.submit "Sign up" %></div>
 <% end %>

如果我拿走"f",则选择标签有效.就在它之前.但是,如果我拿走它,它将不会转到用户对象.如果我把"f." 在,它说:

undefined method `select_tag' for #<ActionView::Helpers::FormBuilder:0x007f950db434e0>

我已经看到一些类似但没有帮助的stackoverflow问题.文档简要提到了这一点,但对于像我这样的新手来说,它太复杂了.

Answer 1

因为它f.select不是f.select_tag.请参阅http://guides.rubyonrails.org/form_helpers.html#select-boxes-for-dealing-with-models