factorygirl create model association NoMethodError: undefined method - ruby-on-rails

Question

When I try to run FactoryGirl.create(:job, :purchased) I get the following error. I have been battling this for a long time now and I believe I have a pluralization issue.
Issue
Models
class Job < ActiveRecord::Base
belongs_to :company
belongs_to :category
has_one :coupon
has_many :payments
end
class Payment < ActiveRecord::Base
belongs_to :job
belongs_to :coupon
end
class Coupon < ActiveRecord::Base
belongs_to :job
end
Factory
FactoryGirl.define do
factory :job do
category
company
title { FFaker::Company.position }
location { "#{FFaker::Address.city}, #{FFaker::AddressUS.state}" }
language_list { [FFaker::Lorem.word] }
short_description { FFaker::Lorem.sentence }
description { FFaker::HTMLIpsum.body }
application_process { "Please email #{FFaker::Internet.email} about the position." }
trait :featured do |job|
job.is_featured true
end
trait :reviewed do |job|
job.reviewed_at { Time.now }
end
trait :purchased do |job|
job.reviewed_at { Time.now }
job.start_at { Time.now }
job.end_at { AppConfig.product['settings']['job_active_for_day_num'].day.from_now }
job.paid_at { Time.now }
association :payment, factory: :payment
end
trait :expired do |job|
start_at = (200..500).to_a.sample.days.ago
job.reviewed_at { start_at }
job.start_at { start_at }
job.end_at { |j| j.start_at + AppConfig.product['settings']['job_active_for_day_num'].days }
job.paid_at { start_at }
# TBD ADD PAYMENT
end
end
end
Partial Schema
create_table "payments", force: :cascade do |t|
t.decimal "price_paid", precision: 8, scale: 2, default: 0.0
t.string "stripe_customer_token"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "jobs", force: :cascade do |t|
t.string "title", limit: 50, null: false
t.string "slug", limit: 250, null: false, index: {name: "index_jobs_on_slug"}
t.string "vanity_url", limit: 250
t.string "location", limit: 100, null: false
t.string "short_description", limit: 250, null: false
t.text "description", null: false
t.text "application_process", null: false
t.boolean "is_featured", default: false
t.datetime "start_at"
t.datetime "end_at"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "company_id", index: {name: "index_jobs_on_company_id"}, foreign_key: {references: "companies", name: "fk_jobs_company_id", on_update: :no_action, on_delete: :no_action}
t.datetime "deleted_at", index: {name: "index_jobs_on_deleted_at"}
t.integer "category_id", index: {name: "index_jobs_on_category_id"}, foreign_key: {references: "categories", name: "fk_jobs_category_id", on_update: :no_action, on_delete: :no_action}
t.datetime "paid_at"
t.datetime "reviewed_at"
t.integer "payment_id", index: {name: "index_jobs_on_payment_id"}, foreign_key: {references: "payments", name: "fk_jobs_payment_id", on_update: :no_action, on_delete: :no_action}
end
create_table "coupons", force: :cascade do |t|
t.integer "code", limit: 8, null: false, index: {name: "index_coupons_on_code", unique: true}
t.integer "percent_discount", limit: 2, null: false
t.datetime "start_at", null: false
t.datetime "end_at", null: false
t.datetime "executed_at"
t.datetime "deleted_at", index: {name: "index_coupons_on_deleted_at"}
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "job_id", index: {name: "index_coupons_on_job_id"}, foreign_key: {references: "jobs", name: "fk_coupons_job_id", on_update: :no_action, on_delete: :no_action}
t.integer "payment_id", index: {name: "index_coupons_on_payment_id"}, foreign_key: {references: "payments", name: "fk_coupons_payment_id", on_update: :no_action, on_delete: :no_action}
end
Updates per chat below
create_table "jobs", force: :cascade do |t|
t.string "title", limit: 50, null: false
t.string "slug", limit: 250, null: false, index: {name: "index_jobs_on_slug"}
t.string "vanity_url", limit: 250
t.string "location", limit: 100, null: false
t.string "short_description", limit: 250, null: false
t.text "description", null: false
t.text "application_process", null: false
t.boolean "is_featured", default: false
t.datetime "start_at"
t.datetime "end_at"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "company_id", index: {name: "index_jobs_on_company_id"}, foreign_key: {references: "companies", name: "fk_jobs_company_id", on_update: :no_action, on_delete: :no_action}
t.datetime "deleted_at", index: {name: "index_jobs_on_deleted_at"}
t.integer "category_id", index: {name: "index_jobs_on_category_id"}, foreign_key: {references: "categories", name: "fk_jobs_category_id", on_update: :no_action, on_delete: :no_action}
t.datetime "paid_at"
t.datetime "reviewed_at"
end
create_table "coupons", force: :cascade do |t|
t.integer "code", limit: 8, null: false, index: {name: "index_coupons_on_code", unique: true}
t.integer "percent_discount", limit: 2, null: false
t.datetime "start_at", null: false
t.datetime "end_at", null: false
t.datetime "executed_at"
t.datetime "deleted_at", index: {name: "index_coupons_on_deleted_at"}
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "job_id", index: {name: "index_coupons_on_job_id"}, foreign_key: {references: "jobs", name: "fk_coupons_job_id", on_update: :no_action, on_delete: :no_action}
end
create_table "payments", force: :cascade do |t|
t.decimal "price_paid", precision: 8, scale: 2, default: 0.0
t.string "stripe_customer_token"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "job_id", index: {name: "index_payments_on_job_id"}, foreign_key: {references: "jobs", name: "fk_payments_job_id", on_update: :no_action, on_delete: :no_action}
t.integer "coupon_id", index: {name: "index_payments_on_coupon_id"}, foreign_key: {references: "coupons", name: "fk_payments_coupon_id", on_update: :no_action, on_delete: :no_action}
end
Errors
TRAITS WORKING
trait :purchased do |job|
job.reviewed_at { Time.now }
job.start_at { Time.now }
job.end_at { AppConfig.product['settings']['job_active_for_day_num'].day.from_now }
job.paid_at { Time.now }
payments { |j| [j.association(:payment)] }
end

Answer 1

In your trait your are defining association :payment, factory: :payment
but job has_many payments.
To work, your models should be:
class Job < ActiveRecord::Base
belongs_to :payment
end
class Payment < ActiveRecord::Base
has_many :jobs
end
If you want to keep your model as you have and create a trait with a job containing multiple payments, you need to do something like this:
How to set up factory in FactoryGirl with has_many association