Fix unknown validator exception when using requires/optional with Entity

.rubocop_todo.yml

@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config --auto-gen-only-exclude --exclude-limit 5000`
-# on 2023-05-27 20:47:15 UTC using RuboCop version 1.50.2.
+# on 2023-07-03 21:04:28 UTC using RuboCop version 1.50.2.
 # 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
@@ -324,7 +324,7 @@ RSpec/MessageChain:
   Exclude:
     - 'spec/grape/middleware/formatter_spec.rb'
 
-# Offense count: 136
+# Offense count: 139
 # Configuration parameters: .
 # SupportedStyles: have_received, receive
 RSpec/MessageSpies:
@@ -335,7 +335,7 @@ RSpec/MissingExampleGroupArgument:
   Exclude:
     - 'spec/grape/middleware/exception_spec.rb'
 
-# Offense count: 765
+# Offense count: 767
 # Configuration parameters: Max.
 RSpec/MultipleExpectations:
   Exclude:
@@ -478,7 +478,7 @@ RSpec/NamedSubject:
     - 'spec/grape/validations/validators/presence_spec.rb'
     - 'spec/grape/validations_spec.rb'
 
-# Offense count: 174
+# Offense count: 171
 # Configuration parameters: Max, AllowedGroups.
 RSpec/NestedGroups:
   Exclude:

lib/grape/validations/params_scope.rb

@@ -358,8 +358,12 @@ def validates(attrs, validations)
         # type casted values
         coerce_type validations, attrs, doc, opts
 
+        # There are a number of documentation options on entities that don't have
+        # corresponding validators. Since there is nowhere that enumerates them all,
+        # we maintain a list of them here and skip looking up validators for them.
+        reserved_keywords = %i[as required param_type is_array format example]
         validations.each do |type, options|
-          next if type == :as
+          next if reserved_keywords.include?(type)
 
           validate(type, options, attrs, doc, opts)
         end

spec/grape/validations_spec.rb

@@ -179,11 +179,12 @@ def define_optional_using
     context 'requires :all using Grape::Entity documentation' do
       def define_requires_all
         documentation = {
-          required_field: { type: String },
-          optional_field: { type: String }
+          required_field: { type: String, required: true, param_type: 'query' },
+          optional_field: { type: String },
+          optional_array_field: { type: Array[String], is_array: true }
         }
         subject.params do
-          requires :all, except: :optional_field, using: documentation
+          requires :all, except: %i[optional_field optional_array_field], using: documentation
         end
       end
       before do
@@ -195,7 +196,7 @@ def define_requires_all
 
       it 'adds entity documentation to declared params' do
         define_requires_all
-        expect(Grape::Validations::ParamsScope::Attr.attrs_keys(declared_params)).to eq(%i[required_field optional_field])
+        expect(Grape::Validations::ParamsScope::Attr.attrs_keys(declared_params)).to eq(%i[required_field optional_field optional_array_field])
       end
 
       it 'errors when required_field is not present' do
@@ -214,8 +215,8 @@ def define_requires_all
     context 'requires :none using Grape::Entity documentation' do
       def define_requires_none
         documentation = {
-          required_field: { type: String },
-          optional_field: { type: String }
+          required_field: { type: String, example: 'Foo' },
+          optional_field: { type: Integer, format: 'int64' }
         }
         subject.params do
           requires :none, except: :required_field, using: documentation