如何爲新表單使用上次創建的表單值？

Question

我有如下機型：

User 
has_many :armies 

Army 
belongs_to :user 

我控制器與增加current_user：

class ArmiesController < ApplicationController 
    before_filter :authenticate_user! 
    def new 
    @army = Army.new 
    end 

    def create 
    @army = current_user.armies.new(params[:army]) 
    respond_to do |format| 
     if @army.save 
     format.html { redirect_to new_army_path, :notice => "New army added" } 
     else 
     format.html { render :new } 
     end 
    end 
    end 
end 

我想用我的最後創建表單價值，爲新的。我們會用我的strength領域爲例：

<%= form_for @army do |f| %> 
    <%= f.label :strength, "Army Strength" %> 
    <%= f.text_field :amount %> 
    <%= f.submit "Create" %> 
<% end %> 

如何節省用戶輸入的在strength字段，因此它仍然是窗體上的值創建的最後一個表格後？

編輯：

def new 
    @army = Army.new(strength: session[:last_army_strength], 
        type_id: session[:last_type]) 
    end 

    def create 
    @army = current_user.armies.new(params[:army]) 
    session[:last_army_strength] = params[:army][:strength] 
    session[:last_type] = params[:army][:type_id] 
    respond_to do |format| 
     if @army.save 
     format.html { redirect_to new_army_path, :notice => "New army added" } 
     else 
     format.html { render :new } 
     end 
    end 
    end 
end 

Answer 1

我認爲這應該工作：

class ArmiesController < ApplicationController 
    before_filter :authenticate_user! 
    def new 
    @army = Army.new(strength: session[:last_army_strength]) 
    end 

    def create 
    @army = current_user.armies.new(params[:army]) 
    session[:last_army_strength] = params[:army][:strength] 
    respond_to do |format| 
     if @army.save 
     format.html { redirect_to new_army_path, :notice => "New army added" } 
     else 
     format.html { render :new } 
     end 
    end 
    end 
end