Fix coercion of complex arrays

CHANGELOG.md

@@ -8,6 +8,7 @@ Next Release
 #### Fixes
 
 * [#1038](https://github.com/intridea/grape/pull/1038): Avoid dup-ing the String class when used in inherited params - [@rnubel](https://github.com/rnubel).
+* [#1042](https://github.com/intridea/grape/issues/1042): Fix coercion of complex arrays - [@dim](https://github.com/dim).
 
 0.12.0 (6/18/2015)
 ==================

lib/grape/validations/validators/coerce.rb

@@ -41,7 +41,9 @@ def _valid_single_type?(klass, val)
       end
 
       def valid_type?(val)
-        if @option.is_a?(Array) || @option.is_a?(Set)
+        if val.instance_of?(InvalidValue)
+          false
+        elsif @option.is_a?(Array) || @option.is_a?(Set)
           _valid_array_type?(@option.first, val)
         else
           _valid_single_type?(@option, val)

spec/grape/validations/validators/coerce_spec.rb

@@ -11,6 +11,14 @@ def app
   end
 
   describe 'coerce' do
+    module CoerceValidatorSpec
+      class User
+        include Virtus.model
+        attribute :id, Integer
+        attribute :name, String
+      end
+    end
+
     context 'i18n' do
       after :each do
         I18n.locale = :en
@@ -82,14 +90,6 @@ def app
     end
 
     context 'complex objects' do
-      module CoerceValidatorSpec
-        class User
-          include Virtus.model
-          attribute :id, Integer
-          attribute :name, String
-        end
-      end
-
       it 'error on malformed input for complex objects' do
         subject.params do
           requires :user, type: CoerceValidatorSpec::User
@@ -148,6 +148,27 @@ class User
           expect(last_response.status).to eq(200)
           expect(last_response.body).to eq('TrueClass')
         end
+
+        it 'Array of Complex' do
+          subject.params do
+            requires :arry, coerce: Array[CoerceValidatorSpec::User]
+          end
+          subject.get '/array' do
+            params[:arry].size
+          end
+
+          get 'array', arry: [31]
+          expect(last_response.status).to eq(400)
+          expect(last_response.body).to eq('arry is invalid')
+
+          get 'array', arry: { id: 31, name: 'Alice' }
+          expect(last_response.status).to eq(400)
+          expect(last_response.body).to eq('arry is invalid')
+
+          get 'array', arry: [{ id: 31, name: 'Alice' }]
+          expect(last_response.status).to eq(200)
+          expect(last_response.body).to eq('1')
+        end
       end
 
       context 'Set' do