ambition/app/models/share.rb

class Share < ActiveRecord::Base
    
    validates :content, presence: true
    
    validates :project_id, presence: true
    
    validates :user_id, presence: true
    
    validate :share_has_atleast_one_character 
    validate :user_exists,on: :create
    validate :project_exists,on: :create
    private 
        def share_has_atleast_one_character
            tmp = content.strip
            if tmp.length < 1
                errors[:content] = "share content should has at least one character"
            end
        end
        
        def user_exists
            
            user = User.find_by(id: user_id)
            if user == nil
                errors[:user] = "user belong to Share is not exist"
            end
        
        end
        def project_exists
            
            project = Project.find_by(id: project_id)
            if project == nil
                errors[:project] = "user belong to Share is not exist"
            end
        
        end    
    
end