Question

我正在使用rails 4中的一个项目，我正在创建一些动态下拉列表。以下是我为此下拉菜单所做的所有代码。下降正在出现，但不会保存到表中并且不会出现在Show中（是的，我有正确的ruby即{。{1}}。

我不知道该怎么做，我是一个铁杆菜鸟，但已经通过语言的教程和课程。

我的表格选择框看起来像这样：

<%= @reports.site_id %>

上面的选择框剂量从站点表中获取数据，但不会将该数据保存到报告表中？`

我的控制器看起来像这样：

`<%= collection_select( :site, :site_id, Site.all, :id, :site_call_sign, {}, { :multiple => false %>`

我的模型看起来像这样：

class ReportsController < ApplicationController
  before_action :set_report, only: [:show, :edit, :update, :destroy]

  # GET /reports
  # GET /reports.json
  def index

    @search = ReportDateSearch.new(params[:search])
    @reports = @search.scope

    @reports = Report.all


  # Adds CSV Downloader to Residents
  respond_to do |format|
    format.html
    format.csv { render text: @reports.to_csv }
    end
  end

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

  # GET /reports/new
  def new
    @report = Report.new
  end

  # GET /reports/1/edit
  def edit
  end

  # POST /reports
  # POST /reports.json
  def create
    @report = Report.new(report_params)

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

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

  # DELETE /reports/1
  # DELETE /reports/1.json
  def destroy
    @report.destroy
    respond_to do |format|
      format.html { redirect_to reports_url, notice: 'Report was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  # Adds CSV Uploader Method to Application
    def import
      Report.import(params[:file])
      redirect_to reports_path, notice: "Report(s) Added Successfully"
    end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def report_params
      params.require(:report).permit(:date, :site_id, :user_id, :type_of_report, :type_of_incident, :report)
    end
end

我的展示页面看起来像：

class Report < ActiveRecord::Base

  belongs_to :user
  belongs_to :site

  def self.import(file)
    CSV.foreach(file.path, headers: true) do |row|
      Report.create! row.to_hash
    end
  end

  def self.to_csv
    CSV.generate do |csv|
      csv << column_names
      all.each do |report|
        csv << report.attributes.values_at(*column_names)
      end
    end
  end

end

不太确定我在哪里出错了。非常感谢任何帮助

Answer 1

如果您的collection_select从:site致电:report，请尝试更改第一个参数：

<%= collection_select( :report, :site_id, Site.all, :id, :site_call_sign, {}, { :multiple => false } %>

我最初的猜测是，您的表单将site_id作为params[:site_id]而不是params[:report][:site_id]传递，这是您根据控制器中的强参数方法所需的格式：

def report_params
  params.require(:report).permit(:date, :site_id, :user_id, :type_of_report, :type_of_incident, :report)
end

如果它不起作用，你可以做的一件事就是查看你的rails控制台，看看你的表单参数从视图发送到控制器的格式。在您的操作中添加一些声明可以帮助您更好地比较params与report_params：

def create
  puts "Params: #{params.inspect}"
  puts "Report Params: #{report_params.inspect}"

  @report = Report.new(report_params)

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

在服务器控制台中查找这两个put语句的输出。如果您在params而不是report_params中看到site_id，则您会知道您的强参数方法已将其过滤掉。

Rails问题

1 个答案: