Rails factory_girls and validation issue - ruby-on-rails

Question

I have HABTM association
my models
class Ssr < ActiveRecord::Base
has_and_belongs_to_many :ssr_groups
validates :ssr_groups, presence: true
end
class SsrGroup < ActiveRecord::Base
has_and_belongs_to_many :ssrs, dependent: :destroy
validates :name, presence: true
end
my factories
FactoryGirl.define do
factory :ssr do
type 'type'
ssr_groups
end
end
FactoryGirl.define do
factory :ssr_group, class: 'SsrGroup', aliases: [:ssr_groups] do
name { SecureRandom.hex }
end
end
My problem is when i want to create FactoryGirl.create(:ssr)
i have got NoMethodError: undefined method each for #<SsrGroup:0x007fbfdf792100>
Why it happens?

Answer 1

Thee problem is that your ssr factory is expecting a collection of ssr_group, and what you are doing is getting just one. That's why the error, because it's trying to do foreach on the created ssr_group.
To fix this, you can do something like this:
FactoryGirl.define do
factory :ssr do
type 'type'
after(:create) do |ssr, evaluator|
create_list(:ssr_group, 1, ssrs: [ssr])
end
end
end
You can use the build strategy instead of the create if preferred.
EDIT:
You can improve your factory a little, like this:
FactoryGirl.define do
factory :ssr do
type 'type'
factory :ssr_with_groups do
transient do
groups_count 5 # Default count of ssr_groups it will create
end
after(:create) do |ssr, evaluator|
create_list(:ssr_group, evaluator.groups_count, ssrs: [ssr])
end
end
end
end
That way, it's more flexible and you can use it like this:
create(:ssr_with_groups, groups_count: 10)
And it would create a ssr with 10 ssr_groups.
EDIT 2:
Given you have a presence validation on the association, you need to add the associations before saving the object, so use the build strategy instead, like this:
FactoryGirl.define do
factory :ssr do
type 'type'
after(:build) do |ssr, evaluator|
ssr.ssr_groups << build_list(:ssr_group, 1, ssrs: [ssr])
end
end
end
You can take a deeper look at the docs: http://www.rubydoc.info/gems/factory_girl/file/GETTING_STARTED.md#Associations