Question

I'm having issue trying to create a validate condition to not allow to save records if it exists.

table open_courses

|id|   |name|
  1     Course 1
  2     Course 2

table movers

|id|  |name|
  1  mover 1
  2  Mover 2

table open_course_deails

|id| |open_course_id|  |mover_id
  1        1                1    #correct save
  2        2                1    #correct save
  3        1                2    #correct save
  4        2                2    #correct save
  5        1                1    #should not save the information
  6        1                2    #should not save the information
  7        2                1    #should not save the information
  8        2                2    #should not save the information

Here is the controller.

def new
  @open_course_detail= OpenCourseDetail.new
end

def create
  @open_course_detail.new(open_course_params)
  if @open_course.save
    redirect_to :index
  end
end

Here is the view.

<%= form_for @open_course_detail do |f| %>
  <%= f.text_field :open_course_id  %>
  <%= f.text_field :mover_id  %>  
<$ end %>

Here is the model open_course_detail.rb

validates :open_course_id,:uniqueness => { message => "Already in use" }

Also I tried:

 validates :mover_id,:uniqueness => { message => "Already in use" }

Answer 1

如果我正确理解的话，那么一行最多只能有一对。尝试<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <input type="text" class="widthinput" /> <textarea class="shorcodeval">[example width="300px"]</textarea>

scope

反之亦然，这取决于您。

Answer 2

自定义验证-

  class OpenCourseDeails < ApplicationRecord

      validate :record_present

      def record_present
        records = OpenCourseDeails.where("open_course_id = ? AND mover_id = ?", self.open_course_id, self.mover_id)
        if records.present?
          errors.add(:record, "Already present!")
        end
      end

  end

How can validate condition in a model?

2 个答案: