Rails SystemStackError: stack level too deep - ruby-on-rails

Question

I am testing my app ( Rails 5) with rspec capybara and factory girl I have the following error...
I am not sure what's happening... I am very new with rspec I hope you could help me :) thank you
Randomized with seed 41137
An error occurred in a `before(:suite)` hook.
Failure/Error: FactoryGirl.lint
SystemStackError:
stack level too deep
You will find my code below:
factories.rb
FactoryGirl.define do
factory :event do
name {Faker::Friends.character}
total_price 50
participant
end
factory :participant do
first_name { Faker::Name.first_name }
salary 900
event
end
end
event.rb
class Event < ApplicationRecord
has_many :participants, inverse_of: :event
validates :participants, presence: true
validates :name, presence: true, length: {minimum: 2}
validates :total_price, presence: true
accepts_nested_attributes_for :participants, reject_if: :all_blank, allow_destroy: true
def total_salary
all_salary = []
participants.each do |participant|
all_salary << participant.salary
end
return #total_salary = all_salary.inject(0,:+)
end
end
event_spec.rb
require 'rails_helper'
describe Event do
it { should have_many(:participants) }
it { should validate_presence_of(:participants) }
it { should validate_presence_of(:name) }
it { should validate_presence_of(:total_price) }
describe "#total_salary" do
it "should return the total salary of the participants" do
partcipant_1 = create(:participant, salary: 2000)
partcipant_2 = create(:participant, salary: 3000)
expect(partcipant_1.salary + partcipant_2.salary).to eq(5000)
end
end
end
edit
In my participant model I had to add optional: true
belongs_to :event, option: true
so fabriciofreitag suggestion works well :)

Answer 1

Let's take a look at your factories:
FactoryGirl.define do
factory :event do
name {Faker::Friends.character}
total_price 50
participant
end
factory :participant do
first_name { Faker::Name.first_name }
salary 900
event
end
end
In this scenario, the creation of event will create a participant, that will create an event, that will create a participant. and so on, in an infinite loop (stack level too deep).
Perhaps you could change it to something like this:
FactoryGirl.define do
factory :event do
name {Faker::Friends.character}
total_price 50
participants { create_list(:participant, 3, event: self) }
end
factory :participant do
first_name { Faker::Name.first_name }
salary 900
end
end