Fix param aliases within 'given' blocks (#1771)

CHANGELOG.md

@@ -11,6 +11,7 @@
 * [#1759](https://github.com/ruby-grape/grape/pull/1759): Update appraisal for rails_edge - [@zvkemp](https://github.com/zvkemp).
 * [#1758](https://github.com/ruby-grape/grape/pull/1758): Fix expanding load_path in gemspec - [@2maz](https://github.com/2maz).
 * [#1765](https://github.com/ruby-grape/grape/pull/1765): Use 415 when request body is of an unsupported media type - [@jdmurphy](https://github.com/jdmurphy).
+* [#1771](https://github.com/ruby-grape/grape/pull/1771): Fix param aliases with 'given' blocks - [@jereynolds](https://github.com/jereynolds).
 * Your contribution here.
 
 ### 1.0.3 (4/23/2018)

lib/grape/validations/params_scope.rb

@@ -116,7 +116,7 @@ def required?
       # @param attrs [Array] (see Grape::DSL::Parameters#requires)
       def push_declared_params(attrs, **opts)
         if lateral?
-          @parent.push_declared_params(attrs)
+          @parent.push_declared_params(attrs, opts)
         else
           if opts && opts[:as]
             @api.route_setting(:aliased_params, @api.route_setting(:aliased_params) || [])

spec/grape/validations/params_scope_spec.rb

@@ -479,6 +479,24 @@ def initialize(value)
       end.to_not raise_error
     end
 
+    it 'allows aliasing of dependent parameters' do
+      subject.params do
+        optional :a
+        given :a do
+          requires :b, as: :c
+        end
+      end
+
+      subject.get('/multiple') { declared(params).to_json }
+
+      get '/multiple', a: 'a', b: 'b'
+
+      body = JSON.parse(last_response.body)
+
+      expect(body.keys).to include('c')
+      expect(body.keys).to_not include('b')
+    end
+
     it 'does not validate nested requires when given is false' do
       subject.params do
         requires :a, type: String, allow_blank: false, values: %w[x y z]