Drop variables and qualify constants

Also remove one leftover from 2.7 ruby

core/lib/rom/attribute.rb

@@ -345,7 +345,11 @@ def to_write_type = type
     # @api public
     def optional
       sum = self.class.new(super, **options)
-      read? ? sum.meta(read: meta[:read].optional) : sum
+      if read?
+        sum.meta(read: meta[:read].optional)
+      else
+        sum
+      end
     end
 
     # @api private

core/lib/rom/command.rb

@@ -255,7 +255,7 @@ def gateway
     # @api private
     def execute(*)
       raise(
-        NotImplementedError,
+        ::NotImplementedError,
         "#{self.class}##{__method__} must be implemented"
       )
     end
@@ -277,7 +277,12 @@ def call(*args, &)
               apply_hooks(before_hooks, *args)
             end
 
-          result = prepared ? execute(prepared, &) : execute(&)
+          result =
+            if prepared
+              execute(prepared, &)
+            else
+              execute(&)
+            end
 
           if curried?
             if !args.empty?

core/lib/rom/command_compiler.rb

@@ -115,7 +115,7 @@ def call(*args)
     # @api private
     def type
       @_type ||= Commands.const_get(Inflector.classify(id))[adapter]
-    rescue NameError
+    rescue ::NameError
       nil
     end
 
@@ -172,7 +172,7 @@ def visit_relation(node, parent_relation = nil)
     # rubocop:enable Metrics/AbcSize, Metrics/MethodLength, Metrics/PerceivedComplexity
 
     # @api private
-    def visit_attribute(*_args) = nil
+    def visit_attribute(*) = nil
 
     # Build a command object for a specific relation
     #

core/lib/rom/configuration.rb

@@ -50,7 +50,7 @@ class Configuration
     # @return [Configuration]
     #
     # @api private
-    def initialize(*args, &)
+    def initialize(*args)
       @environment = Environment.new(*args)
       @notifications = Notifications.event_bus(:configuration)
       @setup = Setup.new(notifications)
@@ -66,7 +66,7 @@ def initialize(*args, &)
     # @return [Configuration]
     #
     # @api public
-    def use(plugin, options = {})
+    def use(plugin, options = EMPTY_HASH)
       if plugin.is_a?(::Array)
         plugin.each { |p| use(p) }
       elsif plugin.is_a?(::Hash)

core/lib/rom/data_proxy.rb

@@ -33,7 +33,7 @@ def self.included(klass)
       klass.class_eval do
         extend ClassMethods
 
-        include Dry::Equalizer(:data)
+        include ::Dry::Equalizer(:data)
 
         option :row_proc, default: -> { self.class.row_proc }
       end

core/lib/rom/enumerable_dataset.rb

@@ -43,7 +43,7 @@ module EnumerableDataset
     #
     # @api private
     def self.included(klass)
-      return unless klass.is_a?(Class)
+      return unless klass.is_a?(::Class)
 
       klass.class_eval do
         extend Initializer

core/lib/rom/environment.rb

@@ -26,7 +26,7 @@ def initialize(*args)
 
     # @api private
     def configure_gateways(*args)
-      normalized_gateway_args = normalize_gateway_args(*args)
+      normalized_gateway_args = normalize_gateway_args(args)
       normalized_gateways = normalize_gateways(normalized_gateway_args)
 
       @gateways, @gateways_map = normalized_gateways.values_at(:gateways, :map)
@@ -38,8 +38,12 @@ def configure_gateways(*args)
     end
 
     # @api private
-    def normalize_gateway_args(*args)
-      args.first.is_a?(Hash) ? args.first : { default: args }
+    def normalize_gateway_args(args)
+      if args.first.is_a?(::Hash)
+        args.first
+      else
+        { default: args }
+      end
     end
 
     # Build gateways using the setup interface

core/lib/rom/model_builder.rb

@@ -60,7 +60,7 @@ def initialize(options = {})
           if parts.any?
             Inflector.constantize(parts.join('::'))
           else
-            Object
+            ::Object
           end
       end
     end

core/lib/rom/open_struct.rb

@@ -18,16 +18,16 @@ def initialize(attributes)
 
     # @api private
     def respond_to_missing?(meth, include_private = false)
-      super || instance_variables.include?(IVAR[meth])
+      instance_variable_defined?(IVAR[meth]) || super
     end
 
     private
 
     # @api private
-    def method_missing(meth, *args, &)
+    def method_missing(meth, *, &)
       ivar = IVAR[meth]
 
-      if instance_variables.include?(ivar)
+      if instance_variable_defined?(ivar)
         instance_variable_get(ivar)
       else
         super

core/lib/rom/registry.rb

@@ -22,18 +22,14 @@ class Registry
     option :cache, default: -> { Cache.new }
 
     # @api private
-    def self.new(*args, **kwargs)
-      if args.empty? && kwargs.empty?
-        super({}, **{})
-      else
-        super
-      end
+    def self.new(elements = {}, *, **)
+      super
     end
 
     # Create a registry without options
     #
     # @api private
-    def self.build(elements = {}) = new(elements, **{})
+    def self.build(elements = {}) = new(elements)
 
     # @api private
     def self.[](identifier)
@@ -78,7 +74,7 @@ def key?(name) = !name.nil? && elements.key?(name.to_sym)
 
     # @api private
     def fetch(key)
-      raise ArgumentError, 'key cannot be nil' if key.nil?
+      raise ::ArgumentError, 'key cannot be nil' if key.nil?
 
       elements.fetch(key.to_sym) do
         return yield if block_given?

core/lib/rom/relation_registry.rb

@@ -6,7 +6,7 @@ module ROM
   # @api private
   class RelationRegistry < Registry
     # @api private
-    def initialize(elements = {}, **options)
+    def initialize(elements = {}, **)
       super
       yield(self, elements) if block_given?
     end