Activerecord::日期时间>对象

Question

最多可预约15人 每家餐厅每天。 所有餐厅一天的预订不得超过 20 个。

我希望能够使用 activerecord 创建一个“条件”，其中预订日期等于参数传递的日期

def create
  @reservation = Reservation.new(reservation_params)
  @restaurant_date = @reservation.startreservation.strftime("%F")
    
  pp @restaurant_date

  @restaurant_reservation = Reservation.where(restaurant_id:    @reservation.restaurant_id).where(:startreservation.strftime("%F") => @restaurant_date )

  pp @restaurant_reservation

    
  # if @restaurant_reservation == 15
  #   redirect_to restaurants_path , alert: "Reservation was not created." 
  # else
  if @reservation.save
    redirect_to reservation_url(@reservation), notice: "Reservation was successfully created." 
  else
    render :new, status: :unprocessable_entity 
  end  
  #end
end

可能是我没把问题解释好，有什么问题我会一一解答。 :)

Answer 1

它是业务逻辑（检查 15 个注册），所以最好的做法是将它放在模型或服务中（而不是在控制器中），例如在模型中使用自定义验证：

class Reservation < ApplicationRecord
  ...
  validate do |reservation|
    if Reservation.where(restaurant_id: reservation.restaurant_id,
                         startreservation: reservation.restaurant_date).size >= 15
      errors.add(:startreservation, :to_much, message: 'Too much on this date.')
    end
  end
  ...
end

...控制器：

def create
  @reservation = Reservation.new(reservation_params)

  if @reservation.save
    redirect_to reservation_url(@reservation), notice: 'Reservation was successfully created.'
  else
    render :new, status: :unprocessable_entity 
  end  
end

ActiveRecord 验证

Answer 2

@restaurant_date = @reservation.startreservation.to_date
    

    *@restaurant_reservation = Reservation.where(restaurant_id: @reservation.restaurant_id).where(startreservation: (@restaurant_date..@restaurant_date+1) ).count
    
    if @restaurant_reservation == 15
      redirect_to restaurants_path , alert: "Reservation can't be created." 
    else*