Support for range size predicate

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 * Your contribution here
+- [#18](https://github.com/numbata/grape-oas/pull/18): Support for range in size? predicate `required(:tags).value(:array, size?: 1..10).each(:string)`
 - [#19](https://github.com/numbata/grape-oas/pull/19): Temporary disable memory profiler workflow for PRs [@numbata](https://github.com/numbata).
 
 ## [1.0.2] - 2025-12-15

lib/grape_oas/introspectors/dry_introspector_support/argument_extractor.rb

@@ -17,6 +17,7 @@ def extract_numeric(arg)
         def extract_range(arg)
           return arg if arg.is_a?(Range)
           return arg[1] if arg.is_a?(Array) && arg.first == :range
+          return arg[1] if arg.is_a?(Array) && arg.first == :size && arg[1].is_a?(Range)
 
           nil
         end

lib/grape_oas/introspectors/dry_introspector_support/predicate_handler.rb

@@ -97,10 +97,17 @@ def apply_pattern(args)
         end
 
         def handle_size(name, args)
-          min_val = ArgumentExtractor.extract_numeric(args[0])
-          max_val = ArgumentExtractor.extract_numeric(args[1]) if name == :size?
-          constraints.min_size = min_val if min_val
-          constraints.max_size = max_val if max_val
+          rng = ArgumentExtractor.extract_range(args.first)
+
+          if rng
+            constraints.min_size = rng.begin if rng.begin
+            constraints.max_size = rng.max if rng.end
+          else
+            min_val = ArgumentExtractor.extract_numeric(args[0])
+            max_val = ArgumentExtractor.extract_numeric(args[1]) if name == :size?
+            constraints.min_size = min_val if min_val
+            constraints.max_size = max_val if max_val
+          end
         end
 
         def handle_range(args)

test/grape_oas/introspectors/dry_introspector_test.rb

@@ -47,6 +47,24 @@ def test_each_array_predicates_apply_to_array_not_items
         assert_equal "string", tags.items.type
       end
 
+      def test_size_range_predicate_sets_min_and_max_size
+        contract = Dry::Schema.Params do
+          required(:tags).value(:array, size?: 1..10).each(:string)
+          required(:labels).value(:array, size?: 1...10).each(:string)
+        end
+
+        schema = processor.build(contract)
+        tags = schema.properties["tags"]
+
+        assert_equal 1, tags.min_items
+        assert_equal 10, tags.max_items
+
+        labels = schema.properties["labels"]
+
+        assert_equal 1, labels.min_items
+        assert_equal 9, labels.max_items
+      end
+
       def test_excluded_values_and_numeric_bounds
         contract = Dry::Schema.Params do
           required(:score).filled(:integer, excluded_from?: [5], gteq?: 1, lteq?: 10)