Modify declare for nested array and hash ruby-grape#2042

CHANGELOG.md

@@ -5,6 +5,7 @@
 * Your contribution here.
 * [#2039](https://github.com/ruby-grape/grape/pull/2039): Travis - update rails versions - [@ericproulx](https://github.com/ericproulx).
 * [#2038](https://github.com/ruby-grape/grape/pull/2038): Travis - update ruby versions - [@ericproulx](https://github.com/ericproulx).
+* [#2043](https://github.com/ruby-grape/grape/pull/2043): Modify declared for nested array and hash - [@kadotami](https://github.com/kadotami).
 
 #### Fixes
 

lib/grape/dsl/inside_route.rb

@@ -28,36 +28,38 @@ def self.post_filter_methods(type)
       # Methods which should not be available in filters until the before filter
       # has completed
       module PostBeforeFilter
-        def declared(passed_params, options = {}, declared_params = nil)
+        def declared(passed_params, options = {}, declared_params = nil, params_nested_path = [])
           options = options.reverse_merge(include_missing: true, include_parent_namespaces: true)
           declared_params ||= optioned_declared_params(**options)
 
           if passed_params.is_a?(Array)
-            declared_array(passed_params, options, declared_params)
+            declared_array(passed_params, options, declared_params, params_nested_path)
           else
-            declared_hash(passed_params, options, declared_params)
+            declared_hash(passed_params, options, declared_params, params_nested_path)
           end
         end
 
         private
 
-        def declared_array(passed_params, options, declared_params)
+        def declared_array(passed_params, options, declared_params, params_nested_path)
           passed_params.map do |passed_param|
-            declared(passed_param || {}, options, declared_params)
+            declared(passed_param || {}, options, declared_params, params_nested_path)
           end
         end
 
-        def declared_hash(passed_params, options, declared_params)
+        def declared_hash(passed_params, options, declared_params, params_nested_path)
           declared_params.each_with_object(passed_params.class.new) do |declared_param, memo|
             if declared_param.is_a?(Hash)
               declared_param.each_pair do |declared_parent_param, declared_children_params|
+                params_nested_path_dup = params_nested_path.dup
+                params_nested_path_dup << declared_parent_param.to_s
                 next unless options[:include_missing] || passed_params.key?(declared_parent_param)
 
                 passed_children_params = passed_params[declared_parent_param] || passed_params.class.new
                 memo_key = optioned_param_key(declared_parent_param, options)
 
-                memo[memo_key] = handle_passed_param(declared_parent_param, passed_children_params) do
-                  declared(passed_children_params, options, declared_children_params)
+                memo[memo_key] = handle_passed_param(passed_children_params, params_nested_path_dup) do
+                  declared(passed_children_params, options, declared_children_params, params_nested_path_dup)
                 end
               end
             else
@@ -77,19 +79,34 @@ def declared_hash(passed_params, options, declared_params)
           end
         end
 
-        def handle_passed_param(declared_param, passed_children_params, &_block)
-          should_be_empty_array?(declared_param, passed_children_params) ? [] : yield
+        def handle_passed_param(passed_children_params, params_nested_path, &_block)
+          if should_be_empty_hash?(passed_children_params, params_nested_path)
+            {}
+          elsif should_be_empty_array?(passed_children_params, params_nested_path)
+            []
+          else
+            yield
+          end
         end
 
-        def should_be_empty_array?(declared_param, passed_children_params)
-          declared_param_is_array?(declared_param) && passed_children_params.empty?
+        def should_be_empty_array?(passed_children_params, params_nested_path)
+          passed_children_params.empty? && declared_param_is_array?(params_nested_path)
         end
 
-        def declared_param_is_array?(declared_param)
-          key = declared_param.to_s
+        def declared_param_is_array?(params_nested_path)
+          key = route_options_params_key(params_nested_path)
           route_options_params[key] && route_options_params[key][:type] == 'Array'
         end
 
+        def should_be_empty_hash?(passed_children_params, params_nested_path)
+          declared_param_is_hash?(params_nested_path) && passed_children_params.empty?
+        end
+
+        def declared_param_is_hash?(params_nested_path)
+          key = route_options_params_key(params_nested_path)
+          route_options_params[key] && route_options_params[key][:type] == 'Hash'
+        end
+
         def route_options_params
           options[:route_options][:params] || {}
         end
@@ -98,6 +115,12 @@ def optioned_param_key(declared_param, options)
           options[:stringify] ? declared_param.to_s : declared_param.to_sym
         end
 
+        def route_options_params_key(params_nested_path)
+          key = params_nested_path[0]
+          key += '[' + params_nested_path[1..-1].join('][') + ']' if params_nested_path.size > 1
+          key
+        end
+
         def optioned_declared_params(**options)
           declared_params = if options[:include_parent_namespaces]
                               # Declared params including parent namespaces

spec/grape/endpoint_spec.rb

@@ -296,9 +296,12 @@ def app
               optional :seventh
             end
           end
+          optional :nested_arr, type: Array do
+            optional :eighth
+          end
         end
-        optional :nested_arr, type: Array do
-          optional :eighth
+        optional :arr, type: Array do
+          optional :nineth
         end
       end
     end
@@ -390,7 +393,7 @@ def app
 
       get '/declared?first=present&nested[fourth]=1'
       expect(last_response.status).to eq(200)
-      expect(JSON.parse(last_response.body)['nested'].keys.size).to eq 3
+      expect(JSON.parse(last_response.body)['nested'].keys.size).to eq 4
     end
 
     it 'builds nested params when given array' do
@@ -422,6 +425,7 @@ def app
         get '/declared?first=present'
         expect(last_response.status).to eq(200)
         expect(JSON.parse(last_response.body)['nested']).to be_a(Hash)
+        expect(JSON.parse(last_response.body)['nested']).to eq({})
       end
 
       it 'to be an array when include_missing is true' do
@@ -431,7 +435,17 @@ def app
 
         get '/declared?first=present'
         expect(last_response.status).to eq(200)
-        expect(JSON.parse(last_response.body)['nested_arr']).to be_a(Array)
+        expect(JSON.parse(last_response.body)['arr']).to be_a(Array)
+      end
+
+      it 'to be an array when nested and include_missing is true' do
+        subject.get '/declared' do
+          declared(params, include_missing: true)
+        end
+
+        get '/declared?first=present&nested[fourth]=1'
+        expect(last_response.status).to eq(200)
+        expect(JSON.parse(last_response.body)['nested']['nested_arr']).to be_a(Array)
       end
 
       it 'to be nil when include_missing is false' do