Rails NoMethodError: undefined method `valid?' -

i relatively new rails , can't figure out how fix bug. here models:

user

class user < activerecord::base     before_save { email.downcase! }     has_many :tickets     has_many :events, through: :tickets       validates :first_name, presence: true     validates :last_name, presence: true      valid_email_regex = /\a[\w+\-.]+@[a-z\d\-]+(\.[a-z\d\-]+)*\.[a-z]+\z/i     validates :email, presence: true, length: { maximum: 255},                     format:     { with: valid_email_regex },                     uniqueness: { case_sensitive: false }   end 

event:

class event < activerecord::base     has_many :tickets     has_many :users, through: :tickets      validates :event_title, presence: true     validates :event_place, presence: true     validates :event_description, presence: true     validates :event_date, presence: true     validates_numericality_of :event_number_tickets, presence: true, numericality: { only_integer: true }, greater_than: 0 end 

ticket:

class ticket < activerecord::base   belongs_to :user   belongs_to :event end 

i have test file tickets

require 'test_helper'  class tickettest < activesupport::testcase    def setup     @user = user.new(first_name: "example", last_name: "user")      @event = event.new(event_title: "example event",                        event_place: "123 example ave.",                         event_description: "our example event children introduced technology",                        event_date: datetime.now,                        event_number_tickets: 30)     @ticket = ticket.new(event: @event, ticket_type: "regular", number_of_children: 1)     @user.tickets << @ticket   end    test "should valid"     assert @user.tickets.valid?        end  end 

whenever run test following error:

nomethoderror: undefined method `valid?' #<ticket::activerecord_associations_collectionproxy:0x007fae767617c8>     test/models/ticket_test.rb:18:in `block in <class:tickettest>' 

do have create custom valid method particular example.

there's not valid? method activerecord collection. if you're trying test last ticket created valid, can assert @ticket.valid?.

i think might doing bit work in setup method. try setup user , event model in setup, , break rest of described different test blocks.