Question

它创建了对象，表示它已成功创建，但所有字段都以nil值保存在数据库中。仅正常保存created_at和updated_at。

我的controllers/admin/categories_controller.rb

的一些方法

  def new
    @admin_category = Category.new
  end

  # GET /admin/categories/1/edit
  def edit
  end

  # POST /admin/categories
  # POST /admin/categories.json
  def create
    @admin_category = Category.new(params[:category])

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

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

这是我的型号/类别型号：

class Category < ActiveRecord::Base
  belongs_to :category
end

这是我的routes.br文件

namespace :admin do
    resources :categories
end

我的观点/ admin / categories / _form.html.erb

<%= form_for(@admin_category, url: admin_categories_path) do |f| %>
  <% if @admin_category.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@admin_category.errors.count, "error") %> prohibited this admin_category from being saved:</h2>

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

  <div class="field">
    <%= f.label :name %><br>
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :is_active %><br>
    <%= f.check_box :is_active %>
  </div>
  <div class="field">
    <%= f.label :main_menu %><br>
    <%= f.check_box :main_menu %>
  </div>
  <div class="field">
    <%= f.label :category_id %><br>
    <%= f.number_field :category_id %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

当我尝试编辑时，我收到此错误：

No route matches [PATCH] "/admin/categories"

我是Ruby on Rails的新手，所以我会帮助你！谢谢！

Answer 1

您在创建新类别时只传递:category：

def create
  @admin_category = Category.new(params[:category])

将其更改为Category.new(user_params)，然后重试。这将传递您正在创建的所有参数并将其提供给数据库。

此外，允许您尝试传递的参数：

def user_params
  params.require(:admin_category).permit(:name, :is_active, :main_menu, :category_id)
end

Answer 2

Strong Params：

#app/controllers/categories_controller.rb
class CategoriesController < ApplicationController
   def create
      @admin_category = Category.new category_params
   end

   private

   def category_params
      params.require(:category).permit(:name, :is_active, :main_menu, :category_id)
   end
end

-

作为提示，如果您使用带有表单的嵌套对象，则可以传递数组中的两个对象以创建嵌套路径：

#app/views/admin/categories/new.html.erb
<%= form_for [:admin, @admin_category] do |f| %>

Rails将我的所有字段保存为nil

2 个答案: