NilClass:Class 的 simple_form 未定义方法 `model_name' [英] simple_form undefined method `model_name' for NilClass:Class
问题描述
我正在学习 Rails,我想使用 simple_form.我正在创建一个简单的应用程序(我的第一个应用程序),并且我想创建一个注册表单.我使用 rails g scaffold User username:string password:string 创建我的模型和控制器.我也在使用 Foundation gem,如果这很重要,我会使用正确的 Foundation 命令安装 simple_form.我找了两个小时的答案,我尝试了很多东西,我不知道我的代码有什么问题.
I'm learning Rails, and I would like to use simple_form. I'm creating a simple app (my first one), and I want to create a signup form. I used rails g scaffold User username:string password:string to create my model and controller. I'm using Foundation gem too, if that's matter, and I install simple_form with the right command for Foundation. I've been looking for answers for two hours, I tried many things, I have no idea of what's wrong with my code.
## app/views/home/index.html.erb ##
<%= simple_form_for @User do |f| %>
<%= f.input :username %>
<%= f.input :password %>
<% end %>
## app/models/user.rb ##
class User < ActiveRecord::Base
end
## app/controllers/users_controller.rb
class UsersController < ApplicationController
before_action :set_user, only: [:show, :edit, :update, :destroy]
# GET /users
# GET /users.json
def index
@users = User.all
end
# GET /users/1
# GET /users/1.json
def show
end
# GET /users/new
def new
@user = User.new
end
# GET /users/1/edit
def edit
end
# POST /users
# POST /users.json
def create
@user = User.new(user_params)
respond_to do |format|
if @user.save
format.html { redirect_to @user, notice: 'User was successfully created.' }
format.json { render action: 'show', status: :created, location: @user }
else
format.html { render action: 'new' }
format.json { render json: @user.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /users/1
# PATCH/PUT /users/1.json
def update
respond_to do |format|
if @user.update(user_params)
format.html { redirect_to @user, notice: 'User was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: @user.errors, status: :unprocessable_entity }
end
end
end
# DELETE /users/1
# DELETE /users/1.json
def destroy
@user.destroy
respond_to do |format|
format.html { redirect_to users_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_user
@user = User.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def user_params
params.require(:user).permit(:username, :password)
end
end
我显然做错了什么,我很确定我会觉得自己像个白痴,但这是我的第一个应用程序:/谢谢.我忘了说,我(拼命地)尝试了每个变量(@user、@users、@User、@Users),它们中的任何一个都不起作用:/
I'm obviously doing something wrong, and I'm pretty sure I will feel like an idiot, but it's my first app :/ Thanks you. I forgot to say, I tried (desperately) every vars (@user, @users, @User, @Users), any of them doesn't works :/
推荐答案
从 index.html.erb
视图中删除表单(不,不要把它放在 show.html.erb
要么!).
Get rid of the form from the index.html.erb
view (and no, don't put it in show.html.erb
either!).
将此表单放在 new.html.erb
视图中:
Place this form in the new.html.erb
view:
<%= simple_form_for @user do |f| %>
<%= f.input :username %>
<%= f.input :password %>
<%= f.submit %>
<% end %>
注意表单应该引用@user
而不是@User
.
Note that the form should reference @user
not @User
.
这篇关于NilClass:Class 的 simple_form 未定义方法 `model_name'的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!