Question

我正在尝试执行更新操作，但我不断收到错误“此专门化已经存在”，即使我把名称完全不同。看来我的嵌套if在Update操作中有问题，但我在Create操作中使用了相同的条件，但它工作正常。如果这是一个明显而愚蠢的问题，我是新手，请原谅我。这是我的动作控制器代码：

class SpecializesController < ApplicationController
  before_action :set_specialize, only: [:show, :edit, :update, :destroy]

  # GET /specializes
  def index
    @specializes = Specialize.all
  end

  # GET /specializes/1
  def show
  end

  # GET /specializes/new
  def new
    @specialize = Specialize.new
  end

  # GET /specializes/1/edit
  def edit
  end

  # POST /specializes
  def create
    if(specialize_params[:name].present? && specialize_params[:specialize_category_id].present?)
      @specialize = Specialize.new(specialize_params)
      if Specialize.where(:name => @specialize.name).blank? 
        @specialize.save
        redirect_to specializes_url, notice: 'Specialize was successfully created.'
      else
        redirect_to specializes_url, notice: 'This specialize already exists.'
      end
    else
      redirect_to specializes_url, notice: 'One or more input is blank. Add failed!'
    end
  end

  # PATCH/PUT /specializes/1
  def update
    if(specialize_params[:name].present? && specialize_params[:specialize_category_id].present?)
      if Specialize.where(:name => @specialize.name).blank?  
        @specialize.update(specialize_params)
        redirect_to specializes_url, notice: 'Specialize was successfully updated.'
      else
        redirect_to specializes_url, notice: 'This specialize already exists.'
      end
    else
      redirect_to specializes_url, notice: 'One or more input is blank. Update failed!'
    end
  end

  # DELETE /specializes/1
  def destroy
    @specialize.destroy
    redirect_to specializes_url, notice: 'Specialize was successfully destroyed.'
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_specialize
      @specialize = Specialize.find(params[:id])
    end

    # Only allow a trusted parameter "white list" through.
    def specialize_params
      params.require(:specialize).permit(:name, :specialize_category_id)
    end
end

Answer 1

您可以执行以下操作来调试此操作：

@specialize.update(specialize_params)

将返回一个布尔值，您可以使用该值来检查验证是否正在通过。

您还可以@specilize.errors查看尝试保存记录时是否有任何错误。

Answer 2

在更新方法中，来自语句@specialize.name is nil的{{1}}的结果是您的代码始终转到else块的原因

我建议如果你不想为@ specialize.name使用double，你可以使用验证规则打开你的模型specialize.rb并在下面添加是检查所以name必须是唯一的

if Specialize.where(:name => @specialize.name).blank?

更新功能无法更新记录

2 个答案: