活動記錄錯誤消息form_tag的Rails 3中

Question

我有一個像這樣

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 

的想法是，用戶在我的模型驗證，只能使每個燈具的一個預測，如果他們試圖提交另一份預測相同夾具那麼他們得到一個消息，說明他們不能爲已經提交..

我使用的form_tag像這樣

<%= 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 

目前即時得到相當難看，而不是實際的

ActiveRecord::RecordInvalid in PredictionsController#create 

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

我如何收到錯誤信息顯示

我認爲這會工作在頁面上

<%= error_messages_for :prediction %> 

同上但它不

任何幫助表示讚賞

Answer 1

使用save它返回布爾值並添加您將讓您的模型附加錯誤。

save!，拋出異常。