Question

当我尝试在rails应用程序上运行ruby时出现以下错误：

NoMethodError in Statuses#index

undefined method `full_name' for #<Status:0x3fe0e38>

我不明白为什么会收到这个错误，如果有人能指出我出错的地方，我将不胜感激！

Index.html.erb

<div class="page-header">
  <h1>All Statuses</h1>
</div>

<%= link_to "Post A New Status", new_status_path, class: "btn btn-success" %>

<% @statuses.each do |status| %> 
<div class="status">
  <strong><%= status.full_name %></strong>
  <p><%= status.content %></p></div>
  <div class="meta">
    <%= link_to time_ago_in_words(status.created_at) + " ago", status %> 
    <span class="admin">
          | <%= link_to "Edit", edit_status_path(status) %> | 
          <%= link_to "Delete", status, method: :delete, data: { confirm: "Are you sure  your want to delete this status?"} %>
    </span>
  </div>
</div>
<% end %>

User.rb

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation, :remember_me,
              :first_name, :last_name, :profile_name
  # attr_accessible :title, :body

  has_many :statuses

  def full_name
    first_name + " " + last_name
  end
end

statuses_controller.rb

class StatusesController < ApplicationController
  # GET /statuses
  # GET /statuses.json
  def index
    @statuses = Status.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @statuses }
    end
  end

  # GET /statuses/1
  # GET /statuses/1.json
  def show
    @status = Status.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @status }
    end
  end

  # GET /statuses/new
  # GET /statuses/new.json
  def new
    @status = Status.new

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @status }
    end
  end

  # GET /statuses/1/edit
  def edit
    @status = Status.find(params[:id])
  end

  # POST /statuses
  # POST /statuses.json
  def create
    @status = Status.new(params[:status])

    respond_to do |format|
      if @status.save
        format.html { redirect_to @status, notice: 'Status was successfully created.' }
        format.json { render json: @status, status: :created, location: @status }
      else
        format.html { render action: "new" }
        format.json { render json: @status.errors, status: :unprocessable_entity }
      end
    end
  end

  # PUT /statuses/1
  # PUT /statuses/1.json
  def update
     @status = Status.find(params[:id])

    respond_to do |format|
      if @status.update_attributes(params[:status])
        format.html { redirect_to @status, notice: 'Status was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: "edit" }
        format.json { render json: @status.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /statuses/1
  # DELETE /statuses/1.json
  def destroy
    @status = Status.find(params[:id])
    @status.destroy

    respond_to do |format|
      format.html { redirect_to statuses_url }
      format.json { head :no_content }
    end
  end
end

Answer 1

因为Status没有full_name。

您的User模型确实如此，但您似乎没有尝试显示用户，而是显示状态。每个用户看起来都有独特的状态，因此您只需打印状态的用户的全名即可。

那就是说，除非你真的需要每个用户的任意状态，否则通常你可能有一个状态表，以及相关用户的状态和连接表，这会使这种技术不合适。

Answer 2

您正在状态对象上调用full_name，但该方法是在用户模型中定义的。如果您希望用户的全名迭代状态，您可以执行以下操作：

<%= status.user.full_name %>

假设状态中的关联存在于用户

Answer 3

实际上，您应该在full_name对象而不是User对象上调用Status。

<strong><%= status.user.full_name %></strong>

假设它们都是关联的（使用belongs_to :user），这应该有效。

状态#index中的NoMethodError

3 个答案: