Freeze the result of the call + some rubocop offenses.

.rubocop_todo.yml

@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2018-11-22 00:04:22 +0900 using RuboCop version 0.51.0.
+# on 2018-12-06 21:06:59 -0500 using RuboCop version 0.51.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -16,10 +16,9 @@ Layout/IndentHeredoc:
     - 'spec/grape/api_spec.rb'
     - 'spec/grape/entity_spec.rb'
 
-# Offense count: 2
+# Offense count: 1
 Lint/AmbiguousBlockAssociation:
   Exclude:
-    - 'lib/grape/middleware/stack.rb'
     - 'spec/grape/dsl/routing_spec.rb'
 
 # Offense count: 1
@@ -75,54 +74,8 @@ Naming/FileName:
     - 'Guardfile'
     - 'Rakefile'
 
-# Offense count: 1
-# Configuration parameters: Blacklist.
-# Blacklist: END, (?-mix:EO[A-Z]{1})
-Naming/HeredocDelimiterNaming:
-  Exclude:
-    - 'lib/grape/router/route.rb'
-
-# Offense count: 3
-# Cop supports --auto-correct.
-# Configuration parameters: AutoCorrect.
-Performance/HashEachMethods:
-  Exclude:
-    - 'lib/grape/api/instance.rb'
-    - 'lib/grape/middleware/versioner/header.rb'
-
-# Offense count: 2
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, SupportedStyles, ProceduralMethods, FunctionalMethods, IgnoredMethods.
-# SupportedStyles: line_count_based, semantic, braces_for_chaining
-# ProceduralMethods: benchmark, bm, bmbm, create, each_with_object, measure, new, realtime, tap, with_object
-# FunctionalMethods: let, let!, subject, watch
-# IgnoredMethods: lambda, proc, it
-Style/BlockDelimiters:
-  Exclude:
-    - 'spec/grape/middleware/formatter_spec.rb'
-
-# Offense count: 1
-Style/CommentedKeyword:
-  Exclude:
-    - 'spec/grape/validations_spec.rb'
-
 # Offense count: 2
 # Configuration parameters: SupportedStyles.
 # SupportedStyles: annotated, template
 Style/FormatStringToken:
   EnforcedStyle: template
-
-# Offense count: 2
-Style/IdenticalConditionalBranches:
-  Exclude:
-    - 'lib/grape/dsl/desc.rb'
-
-# Offense count: 1
-Style/MethodMissing:
-  Exclude:
-    - 'lib/grape/router/attribute_translator.rb'
-
-# Offense count: 1
-Style/MultipleComparison:
-  Exclude:
-    - 'lib/grape/validations/types/custom_type_coercer.rb'

lib/grape/api.rb

@@ -6,7 +6,7 @@ module Grape
   # should subclass this class in order to build an API.
   class API
     # Class methods that we want to call on the API rather than on the API object
-    NON_OVERRIDABLE = Class.new.methods.freeze + %i[call call!]
+    NON_OVERRIDABLE = (Class.new.methods + %i[call call!]).freeze
 
     class << self
       attr_accessor :base_instance, :instances

lib/grape/api/instance.rb

@@ -183,7 +183,7 @@ def add_head_not_allowed_methods_and_options_methods
         # informations again.
         without_root_prefix do
           without_versioning do
-            routes_map.each do |_, config|
+            routes_map.each_value do |config|
               methods = config[:methods]
               allowed_methods = methods.dup
 

lib/grape/dsl/desc.rb

@@ -69,13 +69,12 @@ def desc(description, options = {}, &config_block)
       end
 
       def description_field(field, value = nil)
+        description = route_setting(:description)
         if value
-          description = route_setting(:description)
           description ||= route_setting(:description, {})
           description[field] = value
-        else
-          description = route_setting(:description)
-          description[field] if description
+        elsif description
+          description[field]
         end
       end
 

lib/grape/middleware/stack.rb

@@ -96,7 +96,7 @@ def build(builder = Rack::Builder.new)
       # @param [Array] other_specs An array of middleware specifications (e.g. [[:use, klass], [:insert_before, *args]])
       def concat(other_specs)
         @others << Array(other_specs).reject { |o| o.first == :use }
-        merge_with Array(other_specs).select { |o| o.first == :use }
+        merge_with(Array(other_specs).select { |o| o.first == :use })
       end
 
       protected

lib/grape/middleware/versioner/header.rb

@@ -99,7 +99,7 @@ def fail_with_invalid_version_header!(message)
         def available_media_types
           available_media_types = []
 
-          content_types.each do |extension, _media_type|
+          content_types.each_key do |extension|
             versions.reverse_each do |version|
               available_media_types += [
                 "application/vnd.#{vendor}-#{version}+#{extension}",
@@ -111,7 +111,7 @@ def available_media_types
 
           available_media_types << "application/vnd.#{vendor}"
 
-          content_types.each do |_, media_type|
+          content_types.each_value do |media_type|
             available_media_types << media_type
           end
 

lib/grape/router/attribute_translator.rb

@@ -15,6 +15,8 @@ def method_missing(m, *args)
           @attributes[m[0..-1]] = *args
         elsif m[-1] != '='
           @attributes[m]
+        else
+          super
         end
       end
 

lib/grape/router/route.rb

@@ -98,9 +98,9 @@ def warn_route_methods(name, location, expected = nil)
         path, line = *location.scan(SOURCE_LOCATION_REGEXP).first
         path = File.realpath(path) if Pathname.new(path).relative?
         expected ||= name
-        warn <<-EOS
+        warn <<-WARNING
 #{path}:#{line}: The route_xxx methods such as route_#{name} have been deprecated, please use #{expected}.
-        EOS
+        WARNING
       end
     end
   end

lib/grape/validations/types/custom_type_coercer.rb

@@ -158,7 +158,7 @@ def infer_type_check(type)
         #   necessary.
         def enforce_symbolized_keys(type, method)
           # Collections have all values processed individually
-          if type == Array || type == Set
+          if [Array, Set].include?(type)
             lambda do |val|
               method.call(val).tap do |new_value|
                 new_value.map do |item|

spec/grape/middleware/formatter_spec.rb

@@ -247,15 +247,15 @@ def to_xml
           let(:content_type) { 'application/atom+xml' }
 
           it 'returns a 415 HTTP error status' do
-            error = catch(:error) {
+            error = catch(:error) do
               subject.call(
                 'PATH_INFO' => '/info',
                 'REQUEST_METHOD' => method,
                 'CONTENT_TYPE' => content_type,
                 'rack.input' => io,
                 'CONTENT_LENGTH' => io.length
               )
-            }
+            end
             expect(error[:status]).to eq(415)
             expect(error[:message]).to eq("The provided content-type 'application/atom+xml' is not supported.")
           end
@@ -407,15 +407,15 @@ def self.call(_, _)
         parsers: { json: ->(_object, _env) { raise StandardError, 'fail' } }
       )
       io = StringIO.new('{invalid}')
-      error = catch(:error) {
+      error = catch(:error) do
         subject.call(
           'PATH_INFO' => '/info',
           'REQUEST_METHOD' => 'POST',
           'CONTENT_TYPE' => 'application/json',
           'rack.input' => io,
           'CONTENT_LENGTH' => io.length
         )
-      }
+      end
 
       expect(error[:message]).to eq 'fail'
       expect(error[:backtrace].size).to be >= 1

spec/grape/validations_spec.rb

@@ -1013,7 +1013,7 @@ def validate_param!(attr_name, params)
           expect(last_response.body).to eq('custom is not custom with options!')
         end
       end
-    end # end custom validation
+    end
 
     context 'named' do
       context 'can be defined' do