Make validation consistent for multiple params per requires

Add spec for multiple params per requires

fix validation inconsistency

update changelog

update UPGRADING.md

Author: dgasper

CHANGELOG.md

@@ -3,6 +3,7 @@ Next Release
 
 * [#1503](https://github.com/ruby-grape/grape/pull/1503): Allow to use regexp validator with arrays - [@akoltun](https://github.com/akoltun).
 * [#1507](https://github.com/ruby-grape/grape/pull/1507): Add group attributes for parameter definitions - [@304](https://github.com/304).
+* [#1510](https://github.com/ruby-grape/grape/pull/1510): Fix inconsistent validation - [@dgasper](https://github.com/dgasper).
 * Your contribution here.
 
 0.18.0 (10/7/2016)

UPGRADING.md

@@ -1,6 +1,21 @@
 Upgrading Grape
 ===============
 
+### Upgrading to >= 0.18.1
+
+#### Changed endpoint params validation
+
+Grape now returns validation errors for all params when multiple params are passed to a requires.
+The following code will return `one is missing, two is missing` when calling the endpoint without parameters.
+
+```ruby
+params do
+  requires :one, :two
+end
+```
+
+Prior to this version the response would be `one is missing`.
+
 ### Upgrading to >= 0.17.0
 
 #### Removed official support for Ruby < 2.2.2

lib/grape/validations/validators/base.rb

@@ -39,13 +39,12 @@ def validate(request)
       def validate!(params)
         attributes = AttributesIterator.new(self, @scope, params)
         array_errors = []
-        attributes.each do |resource_params, attr_name, inside_array|
+        attributes.each do |resource_params, attr_name|
           next unless @required || (resource_params.respond_to?(:key?) && resource_params.key?(attr_name))
 
           begin
             validate_param!(attr_name, resource_params)
           rescue Grape::Exceptions::Validation => e
-            raise e unless inside_array
             # we collect errors inside array because
             # there may be more than one error per field
             array_errors << e

spec/grape/validations/validators/presence_spec.rb

@@ -105,6 +105,34 @@ def app
     end
   end
 
+  context 'with multiple parameters per requires' do
+    before do
+      subject.params do
+        requires :one, :two
+      end
+      subject.get '/single-requires' do
+        'Hello'
+      end
+
+      subject.params do
+        requires :one
+        requires :two
+      end
+      subject.get '/multiple-requires' do
+        'Hello'
+      end
+    end
+    it 'validates for all defined params' do
+      get '/single-requires'
+      expect(last_response.status).to eq(400)
+      single_requires_error = last_response.body
+
+      get '/multiple-requires'
+      expect(last_response.status).to eq(400)
+      expect(last_response.body).to eq(single_requires_error)
+    end
+  end
+
   context 'with required parameters and no type' do
     before do
       subject.params do
@@ -117,7 +145,7 @@ def app
     it 'validates name, company' do
       get '/'
       expect(last_response.status).to eq(400)
-      expect(last_response.body).to eq('{"error":"name is missing"}')
+      expect(last_response.body).to eq('{"error":"name is missing, company is missing"}')
 
       get '/', name: 'Bob'
       expect(last_response.status).to eq(400)