Rails 4 - 设置关联的外键值

Question

我有一个名为project的模型，另一个名为invite。

的关联是：

项目

has_many :invites 

邀请

belongs_to :project 

我想让谁创建项目用户发送邀请其他用户加入他们的项目工作。

我有一个表格创建邀请如下：

<%= simple_form_for(@invite, :url => invites_path) do |f| %> 
      <%= f.hidden_field :recipient_id, :value => get_recipient_id %> 
      <%#= f.hidden_field :project_id, :value => current_user.profile.project_id %> 
      <%= f.hidden_field :project_id, :value => @invite.project_id %> 
      <%= f.label :email %> 
      <%= f.email_field :email %> 
      <!-- This field should use :date_picker- but it isnt working --> 
      <%= f.input :expiry, :as => :date, :label => "When do you need a response to this invitation?" %> 
      <%#= f.input :expiry, :as => :date_picker, :label => "When do you need a response to this invitation?" %> 


      <%= f.submit 'Send', :class=>"formsubmit" %> 
      <% end %> 

在上面的表格，我尝试设置PROJECT_ID值。

在邀请控制器，我有：

class InvitesController < ApplicationController 
    before_action :get_project 

    def index 
     @invites = @project.invites 
    end 

    def new 
     # @invite = Invite.new 
     @invite = @project.invites.build 
    end 

    def create 
     @invite = Invite.new(invite_params) 
     @invite.sender_id = current_user.profile.id 
     # @project = Project.find(params[:project_id]) 

     if @invite.save 
      #send existing user email invitation to join project team 
      InviteMailer.existing_user_invite(@invite).deliver_later 
      format.html { redirect_to @project } 

      @invite.recipient.project.push(@invite.project) 
     else 
      @invite.recipient.project.push(@invite.project) 
      InviteMailer.new_user_invite(@invite, new_user_registration_path(:invite_token => @invite.token)).deliver 
     end 

     # oh no, creating an new invitation failed 

    end 

    private 
    # Use callbacks to share common setup or constraints between actions. 
    def set_invite 
     @invite = Invite.find(params[:id]) 
    end 

    def get_project 
     @project = Project.find(params[:project_id]) 
    end 

    # Never trust parameters from the scary internet, only allow the white list through. 
    def invite_params 
     params[:invite].permit(:email, :project_id, :recipient_id) 
    end 
end 

我以为get_project行动前会拿到项目。相反，我得到一个错误，指出：

undefined method `project_id' for #<Profile:0x007fa179509b60> 
Did you mean? project_ids 
       project_ids= 
       projects 
       object_id 

错误消息指向我的形式PROJECT_ID隐藏字段。

任何人都可以看到我要去哪里错了吗？

Answer 1

问题在于其中一个隐藏表单字段中的语句current_user.profile.project_id。

（错误信息指向该代码，但我不知道为什么你有评论在后该行）

这个错误清楚地说，一个profile没有project_id，并且用户可以有多个项目。如果你想访问project_id，你可以做这样的事情。

<%= f.hidden_field :project_id, value: @project.id %> 

@project是从通过get_project方法的控制器访问。