1class Projects_user < ActiveRecord:: Base
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2
  
3    validates :project_id, presence: true
  
4    validates :user_id, presence: true
  
5
  
6    validate :user_exists , on: :create
  
7    validate :project_exists, on: :create
  
8
  
 9    private
  
10
  
11        def project_exists
  
12
  
13            project = Project.find_by(id: project_id)
  
14            if project == nil
  
15                errors[:project] = "project belong to projects_user is not exist"
  
16            end
  
17
  
18        end
  
19
  
20        def user_exists
  
21
  
22            user = User.find_by(id: user_id)
  
23            if user == nil
  
24                errors[:user] = "user belong to projects_user is not exist"
  
25            end
  
26
  
27        end
  
28
  
29end