Fix ContractScope validator + small tweaks (#2510)

* ContractScope's validator inherits from Grape::Validations::Validator::Base
initialize method has been updated accordingly
opts adds fail_fast
Use << when concatenating string
Use map instead of each []

* Add CHANGELOG.md
Add inherits spec

* Fix cop

* Fix spec

CHANGELOG.md

@@ -13,6 +13,7 @@
 * [#2504](https://github.com/ruby-grape/grape/pull/2504): Fix leaky modules in specs - [@ericproulx](https://github.com/ericproulx).
 * [#2506](https://github.com/ruby-grape/grape/pull/2506): Fix fetch_formatter api_format - [@ericproulx](https://github.com/ericproulx).
 * [#2507](https://github.com/ruby-grape/grape/pull/2507): Fix type: Set with values - [@nikolai-b](https://github.com/nikolai-b).
+* [#2510](https://github.com/ruby-grape/grape/pull/2510): Fix ContractScope's validator inheritance - [@ericproulx](https://github.com/ericproulx).
 * Your contribution here.
 
 ### 2.2.0 (2024-09-14)

lib/grape/validations/contract_scope.rb

@@ -24,17 +24,18 @@ def initialize(api, contract = nil, &block)
 
         validator_options = {
           validator_class: Validator,
-          opts: { schema: contract }
+          opts: { schema: contract, fail_fast: false }
         }
 
         api.namespace_stackable(:validations, validator_options)
       end
 
-      class Validator
+      class Validator < Grape::Validations::Validators::Base
         attr_reader :schema
 
-        def initialize(*_args, schema:)
-          @schema = schema
+        def initialize(_attrs, _options, _required, _scope, opts)
+          super
+          @schema = opts.fetch(:schema)
         end
 
         # Validates a given request.
@@ -49,21 +50,17 @@ def validate(request)
             return
           end
 
-          errors = []
-
-          res.errors.messages.each do |message|
-            full_name = message.path.first.to_s
+          raise Grape::Exceptions::ValidationArrayErrors.new(build_errors_from_messages(res.errors.messages))
+        end
 
-            full_name += "[#{message.path[1..].join('][')}]" if message.path.size > 1
+        private
 
-            errors << Grape::Exceptions::Validation.new(params: [full_name], message: message.text)
+        def build_errors_from_messages(messages)
+          messages.map do |message|
+            full_name = message.path.first.to_s
+            full_name << "[#{message.path[1..].join('][')}]" if message.path.size > 1
+            Grape::Exceptions::Validation.new(params: [full_name], message: message.text)
           end
-
-          raise Grape::Exceptions::ValidationArrayErrors.new(errors)
-        end
-
-        def fail_fast?
-          false
         end
       end
     end

spec/integration/dry_validation/dry_validation_spec.rb

@@ -236,4 +236,12 @@
       end
     end
   end
+
+  describe Grape::Validations::ContractScope::Validator do
+    describe '.inherits' do
+      subject { described_class }
+
+      it { is_expected.to be < Grape::Validations::Validators::Base }
+    end
+  end
 end