“找不到<model>没有ID”路线/会话问题

Question

我在这里搜索了我的问题高和低，并没有完全找到正确的答案。我认为这可能是一个简单的路线问题。在我的应用程序中，用户可以创建一个项目，并在正式注册之前通过他们的项目关注“工厂”。更新和编辑项目本身的路线工作正常。在我尝试访问我的“Prelationships”控制器中的CREATE操作以建立“项目”和“植物”之间的关系后，我得到的错误“找不到没有ID的项目”。我的代码如下：

我的routes.rb

resources :sessions,  :only => [:new, :create, :destroy] 
resources :microposts,  :only => [:create, :destroy] 
resources :relationships, :only => [:create, :destroy] 
resources :prelationships, :only => [:create] 
resources :plants 
resources :projects do   
    member do 
    get :pfollowing, :pfollowers 
    end 
end  

我 “Prelationships” 控制器

class PrelationshipsController < ApplicationController 

    def create 
    @project = Project.find(params[:project_id])         
    @plant = Plant.find(params[:prelationship][:pfollowed_id]) 
    @project.pfollow!(@plant) 
    respond_to do |format| 
     format.html { redirect_to @project } 
     format.js { redirect_to @project } 
    end 
    end 
end 

我 “Prelationships” 模式

class Prelationship < ActiveRecord::Base       
attr_accessible :pfollowed_id 

belongs_to :pfollower, :class_name => "Project" 
belongs_to :pfollowed, :class_name => "Plant" 

validates :pfollower_id, :presence => true 
validates :pfollowed_id, :presence => true 
end     

我的 “项目” 模式

class Project < ActiveRecord::Base      
attr_accessible :title, :address, :latitude, :longitude, :state  

belongs_to :user   
has_many :prelationships, :foreign_key => "pfollower_id", 
         :dependent => :destroy 
has_many :pfollowing, :through => :prelationships, :source => :pfollowed   

    def pfollowing?(pfollowed) 
    prelationships.find_by_pfollowed_id(pfollowed) 
    end 

    def pfollow!(pfollowed) 
    prelationships.create!(:pfollowed_id => pfollowed.id) 
    end 
end  

我的“植物”的模式

class Plant < ActiveRecord::Base  

has_many :prelationships, :foreign_key => "pfollowed_id", 
         :class_name => "Prelationship" 
has_many :pfollowers, :through => :reverse_prelationships, 
        :source => :pfollower 
end 

我的部分建立在@project“秀”的关系页面

<%= form_for @project.prelationships.build(:pfollowed_id => 
           @project_id) do |f| %> 
<%= collection_select(:prelationship, :pfollower_id, Plant.all, :id, :name, options = 
{:prompt => "Select your plants"}, :class => "listselect") %> 
<div class="actions"> 
<%= f.submit "Pfollow" %> 
</div> 
<% end %> 

的错误消息是“没有ID找不到项目”一次我打了部分提交。

app/controllers/prelationships_controller.rb:4:in `create' 

和参数：

{"utf8"=>"✓", 
"authenticity_token"=>"NKqa1f0M2yPLQDHbRLnxl3SiwBeTus/1q1hpZjD7hgY=", 
"prelationship"=>{"pfollower_id"=>"5"},"commit"=>"Pfollow"} 

如果这是一个路线问题，我似乎无法找到合适的语言来解决它。我已经建立了一个能够跟随其他用户并且没有这些问题的用户模型，这使我相信我可能需要为我的项目创建一个会话？

请帮助这个新手，请！

Answer 1

最简单的方法：

<%= form_for @project.prelationships.build(:pfollowed_id => 
          @project_id) do |f| %> 
    <%= collection_select(:prelationship, :pfollower_id, Plant.all, :id, :name, options = 
    {:prompt => "Select your plants"}, :class => "listselect") %> 
    <%= hidden_field_tag :project_id, @project.id %> 
    <div class="actions"> 
     <%= f.submit "Pfollow" %> 
    </div> 
<% end %> 

而正确的方法是建立在项目嵌套的路线，但你可以做到这一点重构作为练习以后。