问使用单一模型、rails显示不同表单中相同字段的不同验证消息

EN

 validates_presence_of :full_name       
 validates_presence_of :email, :message => "enter email"
 validates_confirmation_of :password
 validates_presence_of :password, :message=> "enter password"

= form_for(resource, :validate => true, :as => resource_name, :url => registration_path(resource_name)) do |f|
  %ul
    %li
      = f.label :full_name
      = f.text_field :full_name
    %li
    = f.label :email
      = f.email_field :email
    %li
      = f.label :password
      = f.password_field :password
    %li
      = f.label :password_confirmation
      = f.password_field :password_confirmation
    %li
      = f.label :zip
      = f.text_field :zip    
   = f.submit "Sign up", :class=> "btn btn-primary"

= form_for(resource, :validate => true, :as => resource_name, :url => session_path(resource_name)) do |f|      
  %ul
    %li
      = f.label :email
      = f.email_field :email
    %li
      = f.label :password
      = f.password_field :password
    - if devise_mapping.rememberable?
      %li
        = f.check_box :remember_me
        = f.label :remember_me
  %div
    = f.submit "Log in", :class=> "btn btn-primary mt10 ml60"