帮助需要:试图将form\u for的操作方法强制为特定方法时出现语法错误

 <%= form_for([@post, @post.bids.build]),  
 :url => { :action => "offer_bid" } do |f| %>  
    <%= f.submit "Offer Post to this user" %>  
 <% end %>    

我正试图使用上述表单更新bid模型的一个特定列(bid是post下嵌套的模型):-

resources :posts do
    resources :bids
end

我已经有一个新的表格创建一行投标模型。

但是在尝试使用上面的表单时出现了以下语法错误。:-

compile error
/home/saran/work_space/rails_apps/incomplete_bid_excercise/app/views  
/bids/_offer_bid.html.erb:1: syntax error, unexpected tASSOC, expecting kEND  
...st, @post.bids.build]),:url => { :action => "offer_bid" } do...  
                          ^
/home/saran/work_space/rails_apps/incomplete_bid_excercise/app/views  
/bids/_offer_bid.html.erb:1: syntax error, unexpected kDO, expecting kEND  
... { :action => "offer_bid" } do |f| @output_buffer.safe_conca...
                          ^
/home/saran/work_space/rails_apps/incomplete_bid_excercise/app/views  
/bids/_offer_bid.html.erb:7: syntax error, unexpected kENSURE, expecting $end  

提前谢谢:)。