graphql filtering unit test - ruby-on-rails

Question

I'm learning Ruby on Rails with GraphQL and following this tutorial: https://www.howtographql.com/graphql-ruby/7-filtering/
I'm at the last part about writing a unit test and I ran into an error while running bundle exec rails test. Here are my files, they're almost identical to the tutorial:
app > graphql > resolvers > links_search.rb
require 'search_object'
require 'search_object/plugin/graphql'
class Resolvers::LinksSearch < GraphQL::Schema::Resolver
include SearchObject.module(:graphql)
scope { Link.all }
type types[Types::LinkType], null: false
class LinkFilter < ::Types::BaseInputObject
argument :OR, [self], required: false
argument :description_contains, String, required: false
argument :url_contains, String, required: false
end
option :filter, type: LinkFilter, with: :apply_filter
def apply_filter(scope, value)
branches = normalize_filters(value).reduce { |a, b| a.or(b) }
scope.merge branches
end
def normalize_filters(value, branches = [])
scope = Link.all
scope = scope.where('description LIKE ?', "%#{value[:description_contains]}%") if value[:description_contains]
scope = scope.where('url LIKE ?', "%#{value[:url_contains]}%") if value[:url_contains]
branches << scope
value[:OR].reduce(branches) { |s, v| normalize_filters(v, s) } if value[:OR].present?
branches
end
end
app > graphql > types > query_type.rb
module Types
class QueryType < Types::BaseObject
# Add `node(id: ID!) and `nodes(ids: [ID!]!)`
include GraphQL::Types::Relay::HasNodeField
include GraphQL::Types::Relay::HasNodesField
# Add root-level fields here.
# They will be entry points for queries on your schema.
field :all_links, resolver: Resolvers::LinksSearch
end
end
test > graphql > mutations > resolvers > links_search_test.rb
require 'test_helper'
module Resolvers
class LinksSearchTest < ActiveSupport::TestCase
def find(args)
Resolvers::LinksSearch.call(nil, args, nil)
end
def create_user
User.create name: 'example', email: 'example', password: 'example'
end
def create_link(**attributes)
Link.create! attributes.merge(user: create_user)
end
test 'filter option' do
link1 = create_link description: 'test1', url: 'test1.com'
link1 = create_link description: 'test2', url: 'test2.com'
link1 = create_link description: 'test3', url: 'test3.com'
link1 = create_link description: 'test4', url: 'test4.com'
result = find(
filter: {
description_contains: 'test1',
OR: [{
url_contains: 'test2',
OR: [{
url_contains: 'test3'
}]
}, {
description_contains: 'test2'
}]
}
)
assert_equal result.map(&:description).sort, [link1, link2, link3].map(&:description).sort
end
end
end
This is the error I'm receiving:
Resolvers::LinksSearchTest#test_filter_option:
NoMethodError: undefined method `call' for Resolvers::LinksSearch:Class
test/graphql/mutations/resolvers/links_search_test.rb:6:in `find'
test/graphql/mutations/resolvers/links_search_test.rb:23:in `block in <class:LinksSearchTest>'
There seems to be no method call in LinksSearch, not even in the repository of the tutorial I checked on GitHub. I'm not exactly sure what to do here, any help would be appreciated!