Add nested array coercion spec

CHANGELOG.md

@@ -13,6 +13,7 @@
 * [#2091](https://github.com/ruby-grape/grape/pull/2091): Fix ruby 2.7 keyword deprecations - [@dim](https://github.com/dim).
 * [#2097](https://github.com/ruby-grape/grape/pull/2097): Skip to set default value unless `meets_dependency?` - [@wanabe](https://github.com/wanabe).
 * [#2096](https://github.com/ruby-grape/grape/pull/2096): Fix redundant dependency check - [@braktar](https://github.com/braktar).
+* [#2096](https://github.com/ruby-grape/grape/pull/2098): Fix nested coercion - [@braktar](https://github.com/braktar).
 
 ### 1.4.0 (2020/07/10)
 

benchmark/large_model.rb

@@ -79,7 +79,7 @@ def self.vrp_request_vehicle(this)
     this.optional(:cost_time_multiplier, type: Float)
 
     this.optional :router_dimension, type: String, values: %w[time distance]
-    this.optional(:skills, type: Array[Array[String]])
+    this.optional(:skills, type: Array[Array[String]], coerce_with: ->(val) { val.is_a?(String) ? [val.split(/,/).map(&:strip)] : val })
 
     this.optional(:unavailable_work_day_indices, type: Array[Integer])
 
@@ -224,7 +224,10 @@ def self.vrp_request_schedule(this)
     end
   end
   post '/' do
-    'hello'
+    {
+      skills_v1: params[:vrp][:vehicles].first[:skills],
+      skills_v2: params[:vrp][:vehicles].last[:skills]
+    }
   end
 end
 puts Grape::VERSION
@@ -238,7 +241,8 @@ def self.vrp_request_schedule(this)
 
 start = Time.now
 result = RubyProf.profile do
-  API.call env
+  response = API.call env
+  puts response.last
 end
 puts Time.now - start
 printer = RubyProf::FlatPrinter.new(result)

lib/grape/validations/types/custom_type_coercer.rb

@@ -103,13 +103,25 @@ def infer_type_check(type)
             # passed, or if the type also implements a parse() method.
             type
           elsif type.is_a?(Enumerable)
-            ->(value) { value.respond_to?(:all?) && value.all? { |item| item.is_a? type[0] } }
+            lambda do |value|
+              value.is_a?(Enumerable) && value.all? do |val|
+                recursive_type_check(type.first, val)
+              end
+            end
           else
             # By default, do a simple type check
             ->(value) { value.is_a? type }
           end
         end
 
+        def recursive_type_check(type, value)
+          if type.is_a?(Enumerable) && value.is_a?(Enumerable)
+            value.all? { |val| recursive_type_check(type.first, val) }
+          else
+            !type.is_a?(Enumerable) && value.is_a?(type)
+          end
+        end
+
         # Enforce symbolized keys for complex types
         # by wrapping the coercion method such that
         # any Hash objects in the immediate heirarchy

spec/grape/validations/validators/coerce_spec.rb

@@ -620,6 +620,30 @@ def self.parsed?(value)
         expect(JSON.parse(last_response.body)).to eq(%w[a b c d])
       end
 
+      it 'parses parameters with Array[Array[String]] type and coerce_with' do
+        subject.params do
+          requires :values, type: Array[Array[String]], coerce_with: ->(val) { val.is_a?(String) ? [val.split(/,/).map(&:strip)] : val }
+        end
+        subject.post '/coerce_nested_strings' do
+          params[:values]
+        end
+
+        post '/coerce_nested_strings', ::Grape::Json.dump(values: 'a,b,c,d'), 'CONTENT_TYPE' => 'application/json'
+        expect(last_response.status).to eq(201)
+        expect(JSON.parse(last_response.body)).to eq([%w[a b c d]])
+
+        post '/coerce_nested_strings', ::Grape::Json.dump(values: [%w[a c], %w[b]]), 'CONTENT_TYPE' => 'application/json'
+        expect(last_response.status).to eq(201)
+        expect(JSON.parse(last_response.body)).to eq([%w[a c], %w[b]])
+
+        post '/coerce_nested_strings', ::Grape::Json.dump(values: [[]]), 'CONTENT_TYPE' => 'application/json'
+        expect(last_response.status).to eq(201)
+        expect(JSON.parse(last_response.body)).to eq([[]])
+
+        post '/coerce_nested_strings', ::Grape::Json.dump(values: [['a', { bar: 0 }], ['b']]), 'CONTENT_TYPE' => 'application/json'
+        expect(last_response.status).to eq(400)
+      end
+
       it 'parses parameters with Array[Integer] type' do
         subject.params do
           requires :values, type: Array[Integer], coerce_with: ->(val) { val.split(/\s+/).map(&:to_i) }