1

StackOveflowを助けてください、あなたは私の唯一の希望です。

次のエラーが発生し、それが私を夢中にさせています。

Players＃newのNoMethodError

/home/paul/rails_projects/recruits/app/views/players/_form.html.hamlを表示しています。

nil：NilClassの未定義のメソッド `model_name'

抽出されたソース（1行目あたり）：

1：= form_for @player do | f |

2：-if @ player.errors.any？

3：#error_explanation

4：％h2 = "＃{pluralize（@ player.errors.count、" error "）}は、このプレーヤーの保存を禁止しました："

テンプレートの包含のトレース：app / views / players / new.html.haml

Rails.root：/ home / paul / rails_projects/recruitsアプリケーショントレース| フレームワークトレース| フルトレース

app / views / players / _form.html.haml：1：in _app_views_players__form_html_haml___279577567_106102840' app/views/players/new.html.haml:3:in_app_views_players_new_html_haml__860668925_106567710'app / controllers / players_controller.rb：29：in `new'

私はこれをスキャフォールドジェネレーターを使用して作成しました。これは別の領域ではうまく機能しましたが、ここでは明らかに機能しませんでした。

関連するファイルは次のとおりです（scaffoldコマンドによって生成されたファイルに加えた唯一の変更は、プレーヤーモデルにattr_accessableを追加することでした）。

models / player.rb

class Player < ActiveRecord::Base 

  attr_accessible :first_name, :last_name, :scout_height, :scout_weight,
  :scout_profile_url, :scout_star_rating, :scout_overall_ranking,
  :scout_position_ranking, :scout_position, :espn_height, :espn_weight,
  :espn_profile_url, :espn_star_rating, :espn_overall_ranking,
  :espn_position_ranking, :espn_position, :rivals_height, :rivals_weight,
  :rivals_profile_url, :rivals_star_rating, :rivals_overall_ranking,
  :rivals_position_ranking, :rivals_position, :maxprep_height, :maxprep_weight,
  :maxprep_profile_url, :maxprep_star_rating, :maxprep_overall_ranking,
  :maxprep_position_ranking, :maxprep_position, :class, :school_commit, :loi_signed

end

controllers /players_controller.rb

class PlayersController < ApplicationController
  # GET /players
  # GET /players.json
  def index
    @players = Player.all

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

  # GET /players/1
  # GET /players/1.json
  def show
    @player = Player.find(params[:id])

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

  # GET /players/new
  # GET /players/new.json
  def new
    @player = Player.new

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

  # GET /players/1/edit
  def edit
    @player = Player.find(params[:id])
  end

  # POST /players
  # POST /players.json
  def create
    @player = Player.new(params[:player])

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

  # PUT /players/1
  # PUT /players/1.json
  def update
    @player = Player.find(params[:id])

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

  # DELETE /players/1
  # DELETE /players/1.json
  def destroy
    @player = Player.find(params[:id])
    @player.destroy

    respond_to do |format|
      format.html { redirect_to players_url }
      format.json { head :ok }
    end
  end
end

views / players / new.html.haml

%h1 New player

= render 'form'

= link_to 'Back', players_path

ビュー/プレーヤー/_form.html.haml

= form_for @player do |f|
  -if @player.errors.any?
    #error_explanation
      %h2= "#{pluralize(@player.errors.count, "error")} prohibited this player from being saved:"
      %ul
        - @player.errors.full_messages.each do |msg|
          %li= msg

  .field
    = f.label :first_name
    = f.text_field :first_name
  .field
    = f.label :last_name
    = f.text_field :last_name
  .field
    = f.label :scout_height
    = f.number_field :scout_height
  .field
    = f.label :scout_weight
    = f.number_field :scout_weight
  .field
    = f.label :scout_profile_url
    = f.text_field :scout_profile_url
  .field
    = f.label :scout_star_rating
    = f.number_field :scout_star_rating
  .field
    = f.label :scout_overall_ranking
    = f.number_field :scout_overall_ranking
  .field
    = f.label :scout_position_ranking
    = f.number_field :scout_position_ranking
  .field
    = f.label :scout_position
    = f.text_field :scout_position
  .field
    = f.label :espn_height
    = f.number_field :espn_height
  .field
    = f.label :espn_weight
    = f.number_field :espn_weight
  .field
    = f.label :espn_profile_url
    = f.text_field :espn_profile_url
  .field
    = f.label :espn_star_rating
    = f.number_field :espn_star_rating
  .field
    = f.label :espn_overall_ranking
    = f.number_field :espn_overall_ranking
  .field
    = f.label :espn_position_ranking
    = f.number_field :espn_position_ranking
  .field
    = f.label :espn_position
    = f.text_field :espn_position
  .field
    = f.label :rivals_height
    = f.number_field :rivals_height
  .field
    = f.label :rivals_weight
    = f.number_field :rivals_weight
  .field
    = f.label :rivals_profile_url
    = f.text_field :rivals_profile_url
  .field
    = f.label :rivals_star_rating
    = f.number_field :rivals_star_rating
  .field
    = f.label :rivals_overall_ranking
    = f.number_field :rivals_overall_ranking
  .field
    = f.label :rivals_position_ranking
    = f.number_field :rivals_position_ranking
  .field
    = f.label :rivals_position
    = f.text_field :rivals_position
  .field
    = f.label :maxprep_height
    = f.number_field :maxprep_height
  .field
    = f.label :maxprep_weight
    = f.number_field :maxprep_weight
  .field
    = f.label :maxprep_profile_url
    = f.text_field :maxprep_profile_url
  .field
    = f.label :maxprep_star_rating
    = f.number_field :maxprep_star_rating
  .field
    = f.label :maxprep_overall_ranking
    = f.number_field :maxprep_overall_ranking
  .field
    = f.label :maxprep_position_ranking
    = f.number_field :maxprep_position_ranking
  .field
    = f.label :maxprep_position
    = f.text_field :maxprep_position
  .field
    = f.label :class
    = f.number_field :class
  .field
    = f.label :school_commit
    = f.text_field :school_commit
  .field
    = f.label :loi_signed
    = f.check_box :loi_signed
  .actions
    = f.submit 'Save'

ルート.rb

Recruits::Application.routes.draw do

  resources :schools
  resources :players

  #get \"users\/show\"

  root :to => "home#index"

  devise_for :users
  resources :users, :only => :show
end
4

1 に答える 1

3

ここで推測していますが、Playerモデルに「class」という属性を指定したため、これを：player_classなどに変更する必要があると思います。クラスは予約語です。この新しい名前を使用するには、_form.html.erbファイルとindex.html.erbファイルおよびshow.html.erbファイルも更新する必要があります。

于 2011-10-23T21:57:56.237 に答える