帮我StackOveflow，你是我唯一的希望。
我收到了以下错误，它让我发疯了。
玩家中的NoMethodError＃new
显示/home/paul/rails_projects/recruits/app/views/players/_form.html.haml，其中第1行被提出：
未定义的方法`model_name'为nil：NilClass
提取的来源（第1行）：
1：= form_for @player do | f |
2：-if @ player.errors.any？
3：#error_explanation
4：％h2 =“＃{pluralize（@ player.errors.count，”error“）}禁止此播放器被保存：”
模板包含跟踪：app / views / players / new.html.haml
Rails.root：/ home / paul / rails_projects / recruits 应用程序跟踪|框架跟踪|完整跟踪
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：在'new'
我使用脚手架发生器创建了这个，它在另一个区域对我很好，但显然不在这里。
以下是相关文件（我对scaffold命令生成的文件所做的唯一更改是将attr_accessable添加到播放器模型中）。
模型/ 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
控制器/ 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
视图/播放器/ new.html.haml
%h1 New player
= render 'form'
= link_to 'Back', players_path
视图/播放器/ _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'
的routes.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
答案 0 :(得分：3)
我在这里猜测，但我相信这是因为你给了你的玩家模型一个叫做“类”的属性，你应该将其改为：player_class或者什么。 class是保留字。您还应该更新_form.html.erb和index.html.erb以及show.html.erb文件以使用此新名称。