Ruby on rails Rails:param缺失或值为空：admin

我正在从事一个Rails项目，我正在为模型和控制器使用名称空间。也就是说，子模型放在名为

user

的目录中，控制器放在名为

users

的目录中

为了更清楚，我有一个

用户

模型，该模型使用单表继承（STI）具有子

管理员

和

学生

模型。这些子模型继承父模型的所有属性，可以单独定义它们的验证和方法，并放置在名为

user

的目录中

我还有

admin\u controller

和

student\u controller

，它们分别使用

admin

模型和

student

模型。这些控制器放置在名为

users

的目录中

这是我的代码

用户模型：

class User < ApplicationRecord
  has_secure_password
end

class User::Admin < User
end

class User::Student < User
end

class Users::AdminsController < ApplicationController
  before_action :set_admin, only: [:show, :edit, :update, :destroy]

  # GET /admins
  # GET /admins.json
  def index
    @admins = User::Admin.all
  end

  # GET /admins/1
  # GET /admins/1.json
  def show
  end

  # GET /admins/new
  def new
    @admin = User::Admin.new
  end

  # GET /admins/1/edit
  def edit
  end

  # POST /admins
  # POST /admins.json
  def create
    @admin = User::Admin.new(admin_params)

    respond_to do |format|
      if @admin.save
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully created.' }
        format.json { render :show, status: :created, location: users_admin_path(@admin) }
      else
        format.html { render :new }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /admins/1
  # PATCH/PUT /admins/1.json
  def update
    respond_to do |format|
      if @admin.update(admin_params)
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully updated.' }
        format.json { render :show, status: :ok, location: users_admin_path(@admin) }
      else
        format.html { render :edit }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /admins/1
  # DELETE /admins/1.json
  def destroy
    @admin.destroy
    respond_to do |format|
      format.html { redirect_to users_admins_url, notice: 'Admin was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_admin
      @admin = User::Admin.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def admin_params
      params.require(:admin).permit(:email, :password, :role)
  end
end

Rails.application.routes.draw do
  namespace :users do
    resources :admins
    resources :students
  end
end

<p id="notice"><%= notice %></p>

<h1>Admins</h1>

<table>
  <thead>
    <tr>
      <th>Email</th>
      <th>Password</th>
      <th>Role</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @admins.each do |admin| %>
      <tr>
        <td><%= admin.email %></td>
        <td><%= admin.password %></td>
        <td><%= admin.role %></td>
        <td><%= link_to 'Show', users_admin_path(admin) %></td>
        <td><%= link_to 'Edit', edit_users_admin_path(admin) %></td>
        <td><%= link_to 'Destroy', users_admin_path(admin), method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Admin', new_users_admin_path %>

<p id="notice"><%= notice %></p>

<p>
  <strong>Email:</strong>
  <%= @admin.email %>
</p>

<p>
  <strong>Password:</strong>
  <%= @admin.password %>
</p>

<p>
  <strong>Role:</strong>
  <%= @admin.role %>
</p>

<%= link_to 'Edit', edit_users_admin_path(@admin) %> |
<%= link_to 'Back', users_admins_path %>

<% if @admin.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@admin.errors.count, "error") %> prohibited this admin from being saved:</h2>

    <ul>
      <% @admin.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
<% end %>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>

<div class="field">
  <%= form.label :password %>
  <%= form.text_field :password %>
</div>

<div class="field">
  <%= form.label :role %>
  <%= form.text_field :role %>
</div>

<div class="actions">
  <%= form.submit %>
</div>

<h1>New Admin</h1>

<%= form_with(model: @admin, url: users_admins_path, local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Back', users_admins_path %>

<h1>Editing Admin</h1>

<%= form_with(model: @admin, url: users_admin_path(@admin), local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Show', users_admin_path %> |
<%= link_to 'Back', users_admins_path %>

def admin_params
  params.require(:admin).permit(:email, :password, :role)
end

def admin_params
  params.require(:user_admin).permit(:email, :password, :role)
end

index.html.erb：

class User < ApplicationRecord
  has_secure_password
end

class User::Admin < User
end

class User::Student < User
end

class Users::AdminsController < ApplicationController
  before_action :set_admin, only: [:show, :edit, :update, :destroy]

  # GET /admins
  # GET /admins.json
  def index
    @admins = User::Admin.all
  end

  # GET /admins/1
  # GET /admins/1.json
  def show
  end

  # GET /admins/new
  def new
    @admin = User::Admin.new
  end

  # GET /admins/1/edit
  def edit
  end

  # POST /admins
  # POST /admins.json
  def create
    @admin = User::Admin.new(admin_params)

    respond_to do |format|
      if @admin.save
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully created.' }
        format.json { render :show, status: :created, location: users_admin_path(@admin) }
      else
        format.html { render :new }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /admins/1
  # PATCH/PUT /admins/1.json
  def update
    respond_to do |format|
      if @admin.update(admin_params)
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully updated.' }
        format.json { render :show, status: :ok, location: users_admin_path(@admin) }
      else
        format.html { render :edit }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /admins/1
  # DELETE /admins/1.json
  def destroy
    @admin.destroy
    respond_to do |format|
      format.html { redirect_to users_admins_url, notice: 'Admin was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_admin
      @admin = User::Admin.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def admin_params
      params.require(:admin).permit(:email, :password, :role)
  end
end

Rails.application.routes.draw do
  namespace :users do
    resources :admins
    resources :students
  end
end

<p id="notice"><%= notice %></p>

<h1>Admins</h1>

<table>
  <thead>
    <tr>
      <th>Email</th>
      <th>Password</th>
      <th>Role</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @admins.each do |admin| %>
      <tr>
        <td><%= admin.email %></td>
        <td><%= admin.password %></td>
        <td><%= admin.role %></td>
        <td><%= link_to 'Show', users_admin_path(admin) %></td>
        <td><%= link_to 'Edit', edit_users_admin_path(admin) %></td>
        <td><%= link_to 'Destroy', users_admin_path(admin), method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Admin', new_users_admin_path %>

<p id="notice"><%= notice %></p>

<p>
  <strong>Email:</strong>
  <%= @admin.email %>
</p>

<p>
  <strong>Password:</strong>
  <%= @admin.password %>
</p>

<p>
  <strong>Role:</strong>
  <%= @admin.role %>
</p>

<%= link_to 'Edit', edit_users_admin_path(@admin) %> |
<%= link_to 'Back', users_admins_path %>

<% if @admin.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@admin.errors.count, "error") %> prohibited this admin from being saved:</h2>

    <ul>
      <% @admin.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
<% end %>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>

<div class="field">
  <%= form.label :password %>
  <%= form.text_field :password %>
</div>

<div class="field">
  <%= form.label :role %>
  <%= form.text_field :role %>
</div>

<div class="actions">
  <%= form.submit %>
</div>

<h1>New Admin</h1>

<%= form_with(model: @admin, url: users_admins_path, local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Back', users_admins_path %>

<h1>Editing Admin</h1>

<%= form_with(model: @admin, url: users_admin_path(@admin), local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Show', users_admin_path %> |
<%= link_to 'Back', users_admins_path %>

def admin_params
  params.require(:admin).permit(:email, :password, :role)
end

def admin_params
  params.require(:user_admin).permit(:email, :password, :role)
end

管理员
电子邮件
密码
角色

show.html.erb：

class User < ApplicationRecord
  has_secure_password
end

class User::Admin < User
end

class User::Student < User
end

class Users::AdminsController < ApplicationController
  before_action :set_admin, only: [:show, :edit, :update, :destroy]

  # GET /admins
  # GET /admins.json
  def index
    @admins = User::Admin.all
  end

  # GET /admins/1
  # GET /admins/1.json
  def show
  end

  # GET /admins/new
  def new
    @admin = User::Admin.new
  end

  # GET /admins/1/edit
  def edit
  end

  # POST /admins
  # POST /admins.json
  def create
    @admin = User::Admin.new(admin_params)

    respond_to do |format|
      if @admin.save
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully created.' }
        format.json { render :show, status: :created, location: users_admin_path(@admin) }
      else
        format.html { render :new }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /admins/1
  # PATCH/PUT /admins/1.json
  def update
    respond_to do |format|
      if @admin.update(admin_params)
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully updated.' }
        format.json { render :show, status: :ok, location: users_admin_path(@admin) }
      else
        format.html { render :edit }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /admins/1
  # DELETE /admins/1.json
  def destroy
    @admin.destroy
    respond_to do |format|
      format.html { redirect_to users_admins_url, notice: 'Admin was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_admin
      @admin = User::Admin.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def admin_params
      params.require(:admin).permit(:email, :password, :role)
  end
end

Rails.application.routes.draw do
  namespace :users do
    resources :admins
    resources :students
  end
end

<p id="notice"><%= notice %></p>

<h1>Admins</h1>

<table>
  <thead>
    <tr>
      <th>Email</th>
      <th>Password</th>
      <th>Role</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @admins.each do |admin| %>
      <tr>
        <td><%= admin.email %></td>
        <td><%= admin.password %></td>
        <td><%= admin.role %></td>
        <td><%= link_to 'Show', users_admin_path(admin) %></td>
        <td><%= link_to 'Edit', edit_users_admin_path(admin) %></td>
        <td><%= link_to 'Destroy', users_admin_path(admin), method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Admin', new_users_admin_path %>

<p id="notice"><%= notice %></p>

<p>
  <strong>Email:</strong>
  <%= @admin.email %>
</p>

<p>
  <strong>Password:</strong>
  <%= @admin.password %>
</p>

<p>
  <strong>Role:</strong>
  <%= @admin.role %>
</p>

<%= link_to 'Edit', edit_users_admin_path(@admin) %> |
<%= link_to 'Back', users_admins_path %>

<% if @admin.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@admin.errors.count, "error") %> prohibited this admin from being saved:</h2>

    <ul>
      <% @admin.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
<% end %>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>

<div class="field">
  <%= form.label :password %>
  <%= form.text_field :password %>
</div>

<div class="field">
  <%= form.label :role %>
  <%= form.text_field :role %>
</div>

<div class="actions">
  <%= form.submit %>
</div>

<h1>New Admin</h1>

<%= form_with(model: @admin, url: users_admins_path, local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Back', users_admins_path %>

<h1>Editing Admin</h1>

<%= form_with(model: @admin, url: users_admin_path(@admin), local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Show', users_admin_path %> |
<%= link_to 'Back', users_admins_path %>

def admin_params
  params.require(:admin).permit(:email, :password, :role)
end

def admin_params
  params.require(:user_admin).permit(:email, :password, :role)
end

电子邮件：


密码：


角色：

|

\u form.html.erb：

class User < ApplicationRecord
  has_secure_password
end

class User::Admin < User
end

class User::Student < User
end

class Users::AdminsController < ApplicationController
  before_action :set_admin, only: [:show, :edit, :update, :destroy]

  # GET /admins
  # GET /admins.json
  def index
    @admins = User::Admin.all
  end

  # GET /admins/1
  # GET /admins/1.json
  def show
  end

  # GET /admins/new
  def new
    @admin = User::Admin.new
  end

  # GET /admins/1/edit
  def edit
  end

  # POST /admins
  # POST /admins.json
  def create
    @admin = User::Admin.new(admin_params)

    respond_to do |format|
      if @admin.save
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully created.' }
        format.json { render :show, status: :created, location: users_admin_path(@admin) }
      else
        format.html { render :new }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /admins/1
  # PATCH/PUT /admins/1.json
  def update
    respond_to do |format|
      if @admin.update(admin_params)
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully updated.' }
        format.json { render :show, status: :ok, location: users_admin_path(@admin) }
      else
        format.html { render :edit }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /admins/1
  # DELETE /admins/1.json
  def destroy
    @admin.destroy
    respond_to do |format|
      format.html { redirect_to users_admins_url, notice: 'Admin was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_admin
      @admin = User::Admin.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def admin_params
      params.require(:admin).permit(:email, :password, :role)
  end
end

Rails.application.routes.draw do
  namespace :users do
    resources :admins
    resources :students
  end
end

<p id="notice"><%= notice %></p>

<h1>Admins</h1>

<table>
  <thead>
    <tr>
      <th>Email</th>
      <th>Password</th>
      <th>Role</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @admins.each do |admin| %>
      <tr>
        <td><%= admin.email %></td>
        <td><%= admin.password %></td>
        <td><%= admin.role %></td>
        <td><%= link_to 'Show', users_admin_path(admin) %></td>
        <td><%= link_to 'Edit', edit_users_admin_path(admin) %></td>
        <td><%= link_to 'Destroy', users_admin_path(admin), method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Admin', new_users_admin_path %>

<p id="notice"><%= notice %></p>

<p>
  <strong>Email:</strong>
  <%= @admin.email %>
</p>

<p>
  <strong>Password:</strong>
  <%= @admin.password %>
</p>

<p>
  <strong>Role:</strong>
  <%= @admin.role %>
</p>

<%= link_to 'Edit', edit_users_admin_path(@admin) %> |
<%= link_to 'Back', users_admins_path %>

<% if @admin.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@admin.errors.count, "error") %> prohibited this admin from being saved:</h2>

    <ul>
      <% @admin.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
<% end %>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>

<div class="field">
  <%= form.label :password %>
  <%= form.text_field :password %>
</div>

<div class="field">
  <%= form.label :role %>
  <%= form.text_field :role %>
</div>

<div class="actions">
  <%= form.submit %>
</div>

<h1>New Admin</h1>

<%= form_with(model: @admin, url: users_admins_path, local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Back', users_admins_path %>

<h1>Editing Admin</h1>

<%= form_with(model: @admin, url: users_admin_path(@admin), local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Show', users_admin_path %> |
<%= link_to 'Back', users_admins_path %>

def admin_params
  params.require(:admin).permit(:email, :password, :role)
end

def admin_params
  params.require(:user_admin).permit(:email, :password, :role)
end

禁止保存此管理员：

新建.html.erb：

class User < ApplicationRecord
  has_secure_password
end

class User::Admin < User
end

class User::Student < User
end

class Users::AdminsController < ApplicationController
  before_action :set_admin, only: [:show, :edit, :update, :destroy]

  # GET /admins
  # GET /admins.json
  def index
    @admins = User::Admin.all
  end

  # GET /admins/1
  # GET /admins/1.json
  def show
  end

  # GET /admins/new
  def new
    @admin = User::Admin.new
  end

  # GET /admins/1/edit
  def edit
  end

  # POST /admins
  # POST /admins.json
  def create
    @admin = User::Admin.new(admin_params)

    respond_to do |format|
      if @admin.save
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully created.' }
        format.json { render :show, status: :created, location: users_admin_path(@admin) }
      else
        format.html { render :new }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /admins/1
  # PATCH/PUT /admins/1.json
  def update
    respond_to do |format|
      if @admin.update(admin_params)
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully updated.' }
        format.json { render :show, status: :ok, location: users_admin_path(@admin) }
      else
        format.html { render :edit }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /admins/1
  # DELETE /admins/1.json
  def destroy
    @admin.destroy
    respond_to do |format|
      format.html { redirect_to users_admins_url, notice: 'Admin was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_admin
      @admin = User::Admin.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def admin_params
      params.require(:admin).permit(:email, :password, :role)
  end
end

Rails.application.routes.draw do
  namespace :users do
    resources :admins
    resources :students
  end
end

<p id="notice"><%= notice %></p>

<h1>Admins</h1>

<table>
  <thead>
    <tr>
      <th>Email</th>
      <th>Password</th>
      <th>Role</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @admins.each do |admin| %>
      <tr>
        <td><%= admin.email %></td>
        <td><%= admin.password %></td>
        <td><%= admin.role %></td>
        <td><%= link_to 'Show', users_admin_path(admin) %></td>
        <td><%= link_to 'Edit', edit_users_admin_path(admin) %></td>
        <td><%= link_to 'Destroy', users_admin_path(admin), method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Admin', new_users_admin_path %>

<p id="notice"><%= notice %></p>

<p>
  <strong>Email:</strong>
  <%= @admin.email %>
</p>

<p>
  <strong>Password:</strong>
  <%= @admin.password %>
</p>

<p>
  <strong>Role:</strong>
  <%= @admin.role %>
</p>

<%= link_to 'Edit', edit_users_admin_path(@admin) %> |
<%= link_to 'Back', users_admins_path %>

<% if @admin.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@admin.errors.count, "error") %> prohibited this admin from being saved:</h2>

    <ul>
      <% @admin.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
<% end %>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>

<div class="field">
  <%= form.label :password %>
  <%= form.text_field :password %>
</div>

<div class="field">
  <%= form.label :role %>
  <%= form.text_field :role %>
</div>

<div class="actions">
  <%= form.submit %>
</div>

<h1>New Admin</h1>

<%= form_with(model: @admin, url: users_admins_path, local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Back', users_admins_path %>

<h1>Editing Admin</h1>

<%= form_with(model: @admin, url: users_admin_path(@admin), local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Show', users_admin_path %> |
<%= link_to 'Back', users_admins_path %>

def admin_params
  params.require(:admin).permit(:email, :password, :role)
end

def admin_params
  params.require(:user_admin).permit(:email, :password, :role)
end

新管理员

edit.html.erb：

class User < ApplicationRecord
  has_secure_password
end

class User::Admin < User
end

class User::Student < User
end

class Users::AdminsController < ApplicationController
  before_action :set_admin, only: [:show, :edit, :update, :destroy]

  # GET /admins
  # GET /admins.json
  def index
    @admins = User::Admin.all
  end

  # GET /admins/1
  # GET /admins/1.json
  def show
  end

  # GET /admins/new
  def new
    @admin = User::Admin.new
  end

  # GET /admins/1/edit
  def edit
  end

  # POST /admins
  # POST /admins.json
  def create
    @admin = User::Admin.new(admin_params)

    respond_to do |format|
      if @admin.save
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully created.' }
        format.json { render :show, status: :created, location: users_admin_path(@admin) }
      else
        format.html { render :new }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /admins/1
  # PATCH/PUT /admins/1.json
  def update
    respond_to do |format|
      if @admin.update(admin_params)
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully updated.' }
        format.json { render :show, status: :ok, location: users_admin_path(@admin) }
      else
        format.html { render :edit }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /admins/1
  # DELETE /admins/1.json
  def destroy
    @admin.destroy
    respond_to do |format|
      format.html { redirect_to users_admins_url, notice: 'Admin was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_admin
      @admin = User::Admin.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def admin_params
      params.require(:admin).permit(:email, :password, :role)
  end
end

Rails.application.routes.draw do
  namespace :users do
    resources :admins
    resources :students
  end
end

<p id="notice"><%= notice %></p>

<h1>Admins</h1>

<table>
  <thead>
    <tr>
      <th>Email</th>
      <th>Password</th>
      <th>Role</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @admins.each do |admin| %>
      <tr>
        <td><%= admin.email %></td>
        <td><%= admin.password %></td>
        <td><%= admin.role %></td>
        <td><%= link_to 'Show', users_admin_path(admin) %></td>
        <td><%= link_to 'Edit', edit_users_admin_path(admin) %></td>
        <td><%= link_to 'Destroy', users_admin_path(admin), method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Admin', new_users_admin_path %>

<p id="notice"><%= notice %></p>

<p>
  <strong>Email:</strong>
  <%= @admin.email %>
</p>

<p>
  <strong>Password:</strong>
  <%= @admin.password %>
</p>

<p>
  <strong>Role:</strong>
  <%= @admin.role %>
</p>

<%= link_to 'Edit', edit_users_admin_path(@admin) %> |
<%= link_to 'Back', users_admins_path %>

<% if @admin.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@admin.errors.count, "error") %> prohibited this admin from being saved:</h2>

    <ul>
      <% @admin.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
<% end %>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>

<div class="field">
  <%= form.label :password %>
  <%= form.text_field :password %>
</div>

<div class="field">
  <%= form.label :role %>
  <%= form.text_field :role %>
</div>

<div class="actions">
  <%= form.submit %>
</div>

<h1>New Admin</h1>

<%= form_with(model: @admin, url: users_admins_path, local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Back', users_admins_path %>

<h1>Editing Admin</h1>

<%= form_with(model: @admin, url: users_admin_path(@admin), local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Show', users_admin_path %> |
<%= link_to 'Back', users_admins_path %>

def admin_params
  params.require(:admin).permit(:email, :password, :role)
end

def admin_params
  params.require(:user_admin).permit(:email, :password, :role)
end

编辑管理员
|

但是，当我尝试创建新管理员或更新现有管理员时，会出现以下错误：

参数丢失或值为空：admin

---

我已尝试调试问题的原因，但尚未找到解决方法。任何形式的帮助都将不胜感激。

经过仔细检查日志，我终于找到了答案

以下是我解决问题的方法：

class User < ApplicationRecord
  has_secure_password
end

class User::Admin < User
end

class User::Student < User
end

class Users::AdminsController < ApplicationController
  before_action :set_admin, only: [:show, :edit, :update, :destroy]

  # GET /admins
  # GET /admins.json
  def index
    @admins = User::Admin.all
  end

  # GET /admins/1
  # GET /admins/1.json
  def show
  end

  # GET /admins/new
  def new
    @admin = User::Admin.new
  end

  # GET /admins/1/edit
  def edit
  end

  # POST /admins
  # POST /admins.json
  def create
    @admin = User::Admin.new(admin_params)

    respond_to do |format|
      if @admin.save
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully created.' }
        format.json { render :show, status: :created, location: users_admin_path(@admin) }
      else
        format.html { render :new }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /admins/1
  # PATCH/PUT /admins/1.json
  def update
    respond_to do |format|
      if @admin.update(admin_params)
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully updated.' }
        format.json { render :show, status: :ok, location: users_admin_path(@admin) }
      else
        format.html { render :edit }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /admins/1
  # DELETE /admins/1.json
  def destroy
    @admin.destroy
    respond_to do |format|
      format.html { redirect_to users_admins_url, notice: 'Admin was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_admin
      @admin = User::Admin.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def admin_params
      params.require(:admin).permit(:email, :password, :role)
  end
end

Rails.application.routes.draw do
  namespace :users do
    resources :admins
    resources :students
  end
end

<p id="notice"><%= notice %></p>

<h1>Admins</h1>

<table>
  <thead>
    <tr>
      <th>Email</th>
      <th>Password</th>
      <th>Role</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @admins.each do |admin| %>
      <tr>
        <td><%= admin.email %></td>
        <td><%= admin.password %></td>
        <td><%= admin.role %></td>
        <td><%= link_to 'Show', users_admin_path(admin) %></td>
        <td><%= link_to 'Edit', edit_users_admin_path(admin) %></td>
        <td><%= link_to 'Destroy', users_admin_path(admin), method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Admin', new_users_admin_path %>

<p id="notice"><%= notice %></p>

<p>
  <strong>Email:</strong>
  <%= @admin.email %>
</p>

<p>
  <strong>Password:</strong>
  <%= @admin.password %>
</p>

<p>
  <strong>Role:</strong>
  <%= @admin.role %>
</p>

<%= link_to 'Edit', edit_users_admin_path(@admin) %> |
<%= link_to 'Back', users_admins_path %>

<% if @admin.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@admin.errors.count, "error") %> prohibited this admin from being saved:</h2>

    <ul>
      <% @admin.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
<% end %>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>

<div class="field">
  <%= form.label :password %>
  <%= form.text_field :password %>
</div>

<div class="field">
  <%= form.label :role %>
  <%= form.text_field :role %>
</div>

<div class="actions">
  <%= form.submit %>
</div>

<h1>New Admin</h1>

<%= form_with(model: @admin, url: users_admins_path, local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Back', users_admins_path %>

<h1>Editing Admin</h1>

<%= form_with(model: @admin, url: users_admin_path(@admin), local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Show', users_admin_path %> |
<%= link_to 'Back', users_admins_path %>

def admin_params
  params.require(:admin).permit(:email, :password, :role)
end

def admin_params
  params.require(:user_admin).permit(:email, :password, :role)
end

我检查了

创建

操作的请求参数，我意识到它的格式如下：

{"authenticity_token"=>"qJWlHz7Z5myTH3dwNIjjSOzRDY7JN+LoovaG+8dMBnGFRWImJKlWp8cgF7kwTqJXIxqU2fGVkqW9nhOAJ8vFIg==",
 "user_admin"=>{"email"=>"promise@gmail.com", "password"=>"[FILTERED]", "role"=>""},
 "commit"=>"Create Admin"}

因此，请求参数的散列键为

user\u admin

，值为

email

、

password

和

role

，而我是在

admins\u控制器中传递
admin
散列键的

我所要做的就是修改我的
admins\u控制器中的
admins\u参数
私有方法
：

由此：

class User < ApplicationRecord
  has_secure_password
end

class User::Admin < User
end

class User::Student < User
end

class Users::AdminsController < ApplicationController
  before_action :set_admin, only: [:show, :edit, :update, :destroy]

  # GET /admins
  # GET /admins.json
  def index
    @admins = User::Admin.all
  end

  # GET /admins/1
  # GET /admins/1.json
  def show
  end

  # GET /admins/new
  def new
    @admin = User::Admin.new
  end

  # GET /admins/1/edit
  def edit
  end

  # POST /admins
  # POST /admins.json
  def create
    @admin = User::Admin.new(admin_params)

    respond_to do |format|
      if @admin.save
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully created.' }
        format.json { render :show, status: :created, location: users_admin_path(@admin) }
      else
        format.html { render :new }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /admins/1
  # PATCH/PUT /admins/1.json
  def update
    respond_to do |format|
      if @admin.update(admin_params)
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully updated.' }
        format.json { render :show, status: :ok, location: users_admin_path(@admin) }
      else
        format.html { render :edit }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /admins/1
  # DELETE /admins/1.json
  def destroy
    @admin.destroy
    respond_to do |format|
      format.html { redirect_to users_admins_url, notice: 'Admin was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_admin
      @admin = User::Admin.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def admin_params
      params.require(:admin).permit(:email, :password, :role)
  end
end

Rails.application.routes.draw do
  namespace :users do
    resources :admins
    resources :students
  end
end

<p id="notice"><%= notice %></p>

<h1>Admins</h1>

<table>
  <thead>
    <tr>
      <th>Email</th>
      <th>Password</th>
      <th>Role</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @admins.each do |admin| %>
      <tr>
        <td><%= admin.email %></td>
        <td><%= admin.password %></td>
        <td><%= admin.role %></td>
        <td><%= link_to 'Show', users_admin_path(admin) %></td>
        <td><%= link_to 'Edit', edit_users_admin_path(admin) %></td>
        <td><%= link_to 'Destroy', users_admin_path(admin), method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Admin', new_users_admin_path %>

<p id="notice"><%= notice %></p>

<p>
  <strong>Email:</strong>
  <%= @admin.email %>
</p>

<p>
  <strong>Password:</strong>
  <%= @admin.password %>
</p>

<p>
  <strong>Role:</strong>
  <%= @admin.role %>
</p>

<%= link_to 'Edit', edit_users_admin_path(@admin) %> |
<%= link_to 'Back', users_admins_path %>

<% if @admin.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@admin.errors.count, "error") %> prohibited this admin from being saved:</h2>

    <ul>
      <% @admin.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
<% end %>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>

<div class="field">
  <%= form.label :password %>
  <%= form.text_field :password %>
</div>

<div class="field">
  <%= form.label :role %>
  <%= form.text_field :role %>
</div>

<div class="actions">
  <%= form.submit %>
</div>

<h1>New Admin</h1>

<%= form_with(model: @admin, url: users_admins_path, local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Back', users_admins_path %>

<h1>Editing Admin</h1>

<%= form_with(model: @admin, url: users_admin_path(@admin), local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Show', users_admin_path %> |
<%= link_to 'Back', users_admins_path %>

def admin_params
  params.require(:admin).permit(:email, :password, :role)
end

def admin_params
  params.require(:user_admin).permit(:email, :password, :role)
end

对此：

class User < ApplicationRecord
  has_secure_password
end

class User::Admin < User
end

class User::Student < User
end

class Users::AdminsController < ApplicationController
  before_action :set_admin, only: [:show, :edit, :update, :destroy]

  # GET /admins
  # GET /admins.json
  def index
    @admins = User::Admin.all
  end

  # GET /admins/1
  # GET /admins/1.json
  def show
  end

  # GET /admins/new
  def new
    @admin = User::Admin.new
  end

  # GET /admins/1/edit
  def edit
  end

  # POST /admins
  # POST /admins.json
  def create
    @admin = User::Admin.new(admin_params)

    respond_to do |format|
      if @admin.save
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully created.' }
        format.json { render :show, status: :created, location: users_admin_path(@admin) }
      else
        format.html { render :new }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /admins/1
  # PATCH/PUT /admins/1.json
  def update
    respond_to do |format|
      if @admin.update(admin_params)
        format.html { redirect_to users_admin_path(@admin), notice: 'Admin was successfully updated.' }
        format.json { render :show, status: :ok, location: users_admin_path(@admin) }
      else
        format.html { render :edit }
        format.json { render json: @admin.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /admins/1
  # DELETE /admins/1.json
  def destroy
    @admin.destroy
    respond_to do |format|
      format.html { redirect_to users_admins_url, notice: 'Admin was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_admin
      @admin = User::Admin.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def admin_params
      params.require(:admin).permit(:email, :password, :role)
  end
end

Rails.application.routes.draw do
  namespace :users do
    resources :admins
    resources :students
  end
end

<p id="notice"><%= notice %></p>

<h1>Admins</h1>

<table>
  <thead>
    <tr>
      <th>Email</th>
      <th>Password</th>
      <th>Role</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @admins.each do |admin| %>
      <tr>
        <td><%= admin.email %></td>
        <td><%= admin.password %></td>
        <td><%= admin.role %></td>
        <td><%= link_to 'Show', users_admin_path(admin) %></td>
        <td><%= link_to 'Edit', edit_users_admin_path(admin) %></td>
        <td><%= link_to 'Destroy', users_admin_path(admin), method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Admin', new_users_admin_path %>

<p id="notice"><%= notice %></p>

<p>
  <strong>Email:</strong>
  <%= @admin.email %>
</p>

<p>
  <strong>Password:</strong>
  <%= @admin.password %>
</p>

<p>
  <strong>Role:</strong>
  <%= @admin.role %>
</p>

<%= link_to 'Edit', edit_users_admin_path(@admin) %> |
<%= link_to 'Back', users_admins_path %>

<% if @admin.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@admin.errors.count, "error") %> prohibited this admin from being saved:</h2>

    <ul>
      <% @admin.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
<% end %>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>

<div class="field">
  <%= form.label :password %>
  <%= form.text_field :password %>
</div>

<div class="field">
  <%= form.label :role %>
  <%= form.text_field :role %>
</div>

<div class="actions">
  <%= form.submit %>
</div>

<h1>New Admin</h1>

<%= form_with(model: @admin, url: users_admins_path, local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Back', users_admins_path %>

<h1>Editing Admin</h1>

<%= form_with(model: @admin, url: users_admin_path(@admin), local: true) do |form| %>
  <%= render partial: 'form', admin: @admin, locals: { form: form } %>
<% end %>

<%= link_to 'Show', users_admin_path %> |
<%= link_to 'Back', users_admins_path %>

def admin_params
  params.require(:admin).permit(:email, :password, :role)
end

def admin_params
  params.require(:user_admin).permit(:email, :password, :role)
end

这就解决了问题

如果您有这样的问题，请务必检查日志或应用程序跟踪中的请求参数。这将为您提供大量信息，帮助您解决问题

就这些

我希望这有帮助