Chore/Initialize Relation with :qualified_name parameter.

lib/cuprum/collections/relation.rb

@@ -133,6 +133,9 @@ def resolve_parameters(parameters, **ambiguous)
 
     # Methods for resolving a relations's naming and entity class from options.
     module Parameters # rubocop:disable Metrics/ModuleLength
+      PARAMETER_KEYS = %i[entity_class name qualified_name].freeze
+      private_constant :PARAMETER_KEYS
+
       class << self
         # @overload resolve_parameters(entity_class: nil, singular_name: nil, name: nil, qualified_name: nil)
         #   Helper method for resolving a Relation's required parameters.
@@ -262,10 +265,14 @@ def validate_parameter(value, as:)
           value.to_s
         end
 
-        def validate_parameters(**params) # rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/MethodLength
-          unless has_key?(params, :entity_class) || has_key?(params, :name)
-            raise ArgumentError, "name or entity class can't be blank"
-          end
+        def validate_parameter_keys(params)
+          return if PARAMETER_KEYS.any? { |key| has_key?(params, key) }
+
+          raise ArgumentError, "name or entity class can't be blank"
+        end
+
+        def validate_parameters(**params) # rubocop:disable Metrics/MethodLength
+          validate_parameter_keys(params)
 
           if has_key?(params, :entity_class)
             validate_entity_class(params[:entity_class])

lib/cuprum/collections/rspec/contracts/relation_contracts.rb

@@ -324,6 +324,15 @@ module ShouldValidateTheParametersContract
           end
         end
 
+        describe 'with qualified_name: value and name, entity_class: nil' do
+          it 'should not raise an exception' do
+            expect do
+              call_method(entity_class: nil, name: nil, qualified_name: 'books')
+            end
+              .not_to raise_error
+          end
+        end
+
         describe 'with singular_name: an Object' do
           let(:error_message) { 'singular name is not a String or a Symbol' }