Question

我有JobDeliveryCost的表单，用户可以在其中添加投放费用。每次用户添加一个时，都会创建一个附加字段来添加另一个字段。此刻，我有一个表格，我会显示字段。

-jdc_array=(@job.job_delivery_costs.any? ? [@job.job_delivery_costs,@new_delivery].flatten : [@new_delivery])
            -jdc_array.each do |jdc|
              = simple_form_for [:admin, @job, @new_delivery] do |f|

                %tr
                  %td
                    = jdc.timing
                    = f.input :timing, collection: JobDeliveryCost::TIMINGS, :include_blank => "please select"
                  %td
                    = f.input :delivery_cost_id, collection: DeliveryCost.order(:title), :label_method => :title,:value_method => :id
                  %td
                    -if jdc.new_record?
                      =f.submit "add"
                    -else
                  %td
                    = jdc.cost_per_unit
                    = f.input :cost_per_unit
                  %td
                    = jdc.quantity
                    = f.input :quantity

不是在每个表单条目上方显示输入的值，而是如何让字段保持其值？

另外，我如何显示此

的值

  = f.input :delivery_cost_id, collection: DeliveryCost.order(:title), :label_method => :title,:value_method => :id

因为它是DeliveryCost模型的子属性？

对于额外的enfo，我添加了我的控制器和相关模型

class Admin::JobDeliveryCostsController < ApplicationController
    before_action :set_job

  def index
        # raise @job.inspect

    if get_deliverable
      @jdc_array=(@job.job_delivery_costs.any? ? [@job.job_delivery_costs,@new_delivery] : [@new_delivery])
      # raise @jdc_array.inspect
      @new_delivery = @deliverable.job_delivery_costs.build


    end
    set_job_delivery_cost
  end


  def create
    if @job
        @job_delivery_cost = JobDeliveryCost.new(job_delivery_cost_params)
        @job_delivery_cost.job = @job
      if @job_delivery_cost.quantity.nil?
        @job_delivery_cost.quantity = 1
      end
            # raise @job_delivery_cost.inspect
      if @job_delivery_cost.save
        flash[:success] = "Delivery Costs Added"
      else
        flash[:error] = "Delivery Costs not Added"
        end 
    else
        flash[:error] = "Couldn't find the Job."
    end
    redirect_to admin_job_job_delivery_costs_path(@job)
    end


  def destroy
    set_job_delivery_cost 
    if @job.present? && @job_delivery_cost.present?
      @job_delivery_cost.destroy
      flash[:success] = "Job delivery cost removed"
    else
      flash[:error] = "Couldn't find the record"
    end
    redirect_to admin_job_job_products_path(@job)
  end

  private

  def set_job
    @job = Job.find_by(id: params[:job_id])
  end

  def set_job_delivery_cost
    @job_delivery_cost ||= JobDeliveryCost.find_by(id: params[:id])
  end

  def job_delivery_cost_params
    params.require(:job_delivery_cost).permit!
  end

  def get_deliverable
    return @deliverable if @deliverable
    if params[:contact_id].present?
      @deliverable = Contact.find_by(id: params[:contact_id])
    elsif params[:client_id].present?
      @deliverable = Client.find_by(id: params[:client_id])
    elsif params[:job_id].present?
      @deliverable = Job.find_by(id: params[:job_id])
    end
    @deliverable
  end

end

delivery_cost.rb

# == Schema Information
#
# Table name: delivery_costs
#
#  id            :integer          not null, primary key
#  title         :string(255)
#  unit          :string(255)
#  cost_per_unit :float
#  created_at    :datetime
#  updated_at    :datetime
#

class DeliveryCost < ActiveRecord::Base

  UNIT_DAY='day'
  UNIT_HOUR='hour'
  UNIT_MILE='mile'
  UNITS=[UNIT_DAY,UNIT_HOUR,UNIT_MILE]

  has_many :job_delivery_costs
  has_many :jobs, through: :job_delivery_costs

  validates :cost_per_unit, presence: true
  validates :unit, inclusion: UNITS
  validates :title, presence: true
  before_destroy :survive_if_jobs

  private

  def survive_if_jobs
    jobs.empty?
  end
end

JobDeliveryCost

# == Schema Information
#
# Table name: job_delivery_costs
#
#  id               :integer          not null, primary key
#  job_id           :integer
#  delivery_cost_id :integer
#  cost_per_unit    :float
#  quantity         :integer
#  timing           :string(255)
#  created_at       :datetime
#  updated_at       :datetime
#

class JobDeliveryCost < ActiveRecord::Base
  TIMING_INSTALL='install'
  TIMING_BREAKDOWN='breakdown'

  TIMINGS=[TIMING_INSTALL,TIMING_BREAKDOWN]

  belongs_to :delivery_cost
  belongs_to :job
  validates :quantity, presence: true, numericality: {greater_than_or_equal_to:1}
  validates :timing, inclusion: TIMINGS
  #validates :cost_per_unit, presence: true

validate :validate_cost_per_unit
  validate :check_associates
  # validate :quantity_default
  before_save :init


  private

  def check_associates
    associated_object_exists DeliveryCost, :delivery_cost_id
    associated_object_exists Job, :job_id
  end

  def validate_cost_per_unit
    if delivery_cost and cost_per_unit.blank?
      self.cost_per_unit=delivery_cost.cost_per_unit
    end
    return false if cost_per_unit.blank?
  end

    def init
      if self.quantity.nil?
        self.quantity = 1
      end
    end

end

Answer 1

如果我理解正确，您将要使用javascript来解决您的问题。有一个很好的railscast讨论了嵌套模型表单，但它也向您展示了如何构建javascript以动态添加带链接的字段元素。

您很可能希望注册onChange事件（意味着用户更改了字段中的数据）而不是链接，以添加另一个字段。

确保字段保持值，因为更多字段添加了rails

1 个答案: