無法設置載體

Question

我試圖設置載體爲我的新用戶，但是當我提出我得到這個errorr

Carrier(#37295244) expected, got String(#15496392)

<div class= "field"> 
     <%= f.label :carrier %><br> 
     <%= f.collection_select(:carrier, Carrier.find(:all) ,:name, :name) %> 
    </div> 

的usermodel

class User < ActiveRecord::Base 

    acts_as_authentic 
    after_create :set_sub 
    after_create :set_universal 
    after_create :set_carrier 

    def set_sub 
    #self.roles << "subscriber" 
    self.roles_mask = 4 
    end 

    def set_universal 
     self.channels << Channel.find(1) 
    end 

    def set_carrier 
    self.carriers<< self.carrier_name 
    end 

    ROLES = %w[admin moderator subscriber] 

    #Each user can subscribe to many channels 
    has_and_belongs_to_many :channels 

    #Each user who is a moderator can moderate many channels 
    #has_many :channel_mods 
    has_and_belongs_to_many :modifies , :class_name => "Channel" 

    #Each user can receive many messages 
    has_and_belongs_to_many :messages 

    #Each user belongs to a carrier 
    belongs_to :carrier 

    #Filter users by role(s) 
    named_scope :with_role, lambda { |role| {:conditions => "roles_mask & #{2**ROLES.index(role.to_s)} > 0 "} } 

    def roles 
    ROLES.reject { |r| ((roles_mask || 0) & 2**ROLES.index(r)).zero? } 
    end 

    def roles=(roles) 
    self.roles_mask = (roles & ROLES).map { |r| 2**ROLES.index(r) }.sum 
    end 

    def role_symbols 
    roles.map do |role| 
    role.underscore.to_sym # NOT role.name.underscore.to_sym (role is a string) 
    end 
    end 


end 

載體模型

class Carrier < ActiveRecord::Base 
    has_many :users 
end 

用戶控制器

class UsersController < ApplicationController 

    filter_resource_access 

    # GET /users 
    # GET /users.xml 
    def index 
    @users = User.all 

    respond_to do |format| 
     format.html # index.html.erb 
     format.xml { render :xml => @users } 
    end 
    end 

    # GET /users/1 
    # GET /users/1.xml 
    def show 
    #@user = User.find(params[:id]) 

    respond_to do |format| 
     format.html # show.html.erb 
     format.xml { render :xml => @user } 
    end 
    end 

    # GET /users/new 
    # GET /users/new.xml 
    def new 
    #@user = User.new 
    @carriers = Carrier.find(:all) 

    respond_to do |format| 
     format.html # new.html.erb 
     format.xml { render :xml => @user } 
    end 
    end 

    # GET /users/1/edit 
    def edit 
    #@user = User.find(params[:id]) 
    end 

    def create 
    #@user = User.new(params[:user]) 
    #@user.channels << Channel.find(1) 

    respond_to do |format| 
     if @user.save 
     format.html { redirect_to(:channels, :notice => 'Registration successfully.') } 
     format.xml { render :xml => @user, :status => :created, :location => @user } 
     else 
     format.html { render :action => "new" } 
     format.xml { render :xml => @user.errors, :status => :unprocessable_entity } 
     end 
    end 
    end 

    def profile 
    @user = User.find(params[:id]) 
    end 



    # PUT /users/1 
    # PUT /users/1.xml 
    def update 
    #@user = current_user 

    respond_to do |format| 
     if @user.update_attributes(params[:user]) 
     format.html { redirect_to(@user, :notice => 'User was successfully updated.') } 
     format.xml { head :ok } 
     else 
     format.html { render :action => "edit" } 
     format.xml { render :xml => @user.errors, :status => :unprocessable_entity } 
     end 
    end 
    end 

    # DELETE /users/1 
    # DELETE /users/1.xml 
    def destroy 
    @user = User.find(params[:id]) 
    @user.destroy 
    respond_to do |format| 
     format.html { redirect_to(users_url) } 
     format.xml { head :ok } 
    end 
    end 

    def delete 
    @user = User.find(params[:user_id]) 
    @user.destroy 
    redirect_to :users 
    end 

end 

Answer 1

我沒有測試你的代碼，但在第一眼看得出是可能是錯誤的來源：分配CARRIER_NAME

def set_carrier 
    self.carriers<< self.carrier_name 
    end 

，可能是一個字符串self.carriers應該舉行Carrier對象的數組。