Building Associations in Factory Girl - ruby-on-rails

Question

I have two models Users and Accounts which has the relationship
Users has_many Accounts via `created_by_id`
users.rb
FactoryGirl.define do
factory :user do
first_name {Faker::Name.first_name}
last_name {Faker::Name.last_name}
email {Faker::Internet.email}
username {Faker::Internet.user_name}
password {Faker::Internet.password}
end
end
accounts.rb
FactoryGirl.define do
factory :account do
name {Faker::Company.name}
association :user
end
end
Models
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable,
:validatable, :confirmable, :invitable
has_many :accounts
# validations
validates :first_name, presence: true
validates :last_name, presence: true
validates :email, presence: true,
uniqueness: {case_sensitive: false},
:email => true
validates :username, uniqueness: {case_sensitive: false, allow_blank: true}
before_validation :downcase_attributes
def name
"#{first_name} #{last_name}"
end
private
def downcase_attributes
self.email = email.try(:downcase)
self.username = username.try(:downcase)
end
end
Accounts Model
class Account < ActiveRecord::Base
extend FriendlyId
friendly_id :name, use: :slugged
belongs_to :users, foreign_key: "created_by_id"
# Methods
def should_generate_new_friendly_id?
name_changed?
end
end
When i try to Testing the Validity of the Factories by the following
require 'rails_helper'
describe Account, type: :model do
context "valid Factory" do
it "has a valid factory" do
expect(build(:account)).to be_valid
end
end
context "validations" do
before { create(:account) }
context "presence" do
it { should validate_presence_of :name }
end
end
end
Error
Account
valid Factory
has a valid factory (FAILED - 1)
validations
presence
example at ./spec/models/account_spec.rb:15 (FAILED - 2)
Failures:
1) Account valid Factory has a valid factory
Failure/Error: expect(build(:account)).to be_valid
NoMethodError:
undefined method `user=' for #<Account:0x007f858a4783a0>
# ./spec/models/account_spec.rb:7:in `block (3 levels) in <top (required)>'
2) Account validations presence
Failure/Error: before { create(:account) }
NoMethodError:
undefined method `user=' for #<Account:0x007f8595154088>
# ./spec/models/account_spec.rb:12:in `block (3 levels) in <top (required)>'
Finished in 0.87731 seconds (files took 5.61 seconds to load)
2 examples, 2 failures
Failed examples:
rspec ./spec/models/account_spec.rb:6 # Account valid Factory has a valid factory
rspec ./spec/models/account_spec.rb:15 # Account validations presence

Answer 1

This line:
belongs_to :users, foreign_key: "created_by_id"
should be changed to:
belongs_to :user, foreign_key: :created_by_id # notice singular :user
From docs:
A belongs_to association sets up a
one-to-one connection with another model, such that each instance of
the declaring model "belongs to" one instance of the other model. ...