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我的模型中有这样的验证

class Prediction < ActiveRecord::Base
attr_accessible :home_team, :away_team, :home_score, :away_score, :fixture_date, :fixture_id, :user_id

has_one :fixture

validates :fixture_id, :uniqueness => { :scope => :user_id, :message => "only one prediction per game is allowed, for each user" }

end

用户的想法是每个灯具只能做出一个预测，如果他们尝试为同一个灯具提交另一个预测，那么他们会收到一条消息，说明他们不能因为已经提交了。

我正在使用 form_tag 像这样

<%= form_tag controller: 'predictions', action: 'create', method: 'post' do %>
 <%= error_messages_for :prediction %><!-- Just added this -->

<% @fixture_date.sort.each do |date, fixture| %>
<%= date_format(date) %>
  <% fixture.each do |fixture|%>
   <%= fixture.home_team %>
   <%= text_field_tag "predictions[][home_score]" %> 
   <%= text_field_tag "predictions[][away_score]" %>

   <%= fixture.away_team %>  
    <%= hidden_field_tag "predictions[][home_team]", fixture.home_team %>
    <%= hidden_field_tag "predictions[][away_team]", fixture.away_team %>
    <%= hidden_field_tag "predictions[][fixture_date]", fixture.fixture_date %>
    <%= hidden_field_tag "predictions[][fixture_id]", fixture.id %>
    <%= hidden_field_tag "predictions[][user_id]", current_user.id %>
    <% end %>

控制器

def create
begin
  params[:predictions].each do |prediction|
    Prediction.new(prediction).save!
  end
  redirect_to root_path, :notice => 'Predictions Submitted Successfully'
end
end

目前我变得相当丑陋且不实用

ActiveRecord::RecordInvalid in PredictionsController#create

Validation failed: Fixture only one prediction per game is allowed, for each user

如何让错误消息显示在页面上

我以为这行得通

<%= error_messages_for :prediction %>

如上，但它没有

任何帮助表示赞赏

4

1 回答 1

1

使用savewhich 返回布尔值并添加，您的模型将附加错误。

save!, 抛出异常。

于 2013-05-10T13:41:28.187 回答