Support for hiding parameters from documentation

.rubocop_todo.yml

@@ -28,7 +28,7 @@ Metrics/AbcSize:
 # Offense count: 3
 # Configuration parameters: CountComments.
 Metrics/ClassLength:
-  Max: 209
+  Max: 216
 
 # Offense count: 10
 Metrics/CyclomaticComplexity:

CHANGELOG.md

@@ -3,7 +3,8 @@
 #### Features
 
 * [#448](https://github.com/ruby-grape/grape-swagger/pull/448): Header parameters are now prepended to the parameter list - [@anakinj](https://github.com/anakinj).
-* [#444](https://github.com/ruby-grape/grape-swagger/pull/444): With multi types parameter the first type is use as the documentation type [@scauglog](https://github.com/scauglog).
+* [#444](https://github.com/ruby-grape/grape-swagger/pull/444): With multi types parameter the first type is use as the documentation type - [@scauglog](https://github.com/scauglog).
+* [#463](https://github.com/ruby-grape/grape-swagger/pull/463): Added 'hidden' option for parameter to be exclude from generated documentation - [@anakinj](https://github.com/anakinj).
 * Your contribution here.
 
 #### Fixes

Gemfile

@@ -10,3 +10,8 @@ else
 end
 
 gem ENV['MODEL_PARSER'] if ENV.key?('MODEL_PARSER')
+
+if RUBY_VERSION < '2.2.2'
+  gem 'rack', '<2.0.0'
+  gem 'activesupport', '<5.0.0'
+end

README.md

@@ -351,6 +351,7 @@ add_swagger_documentation \
 * [Overriding param type](#overriding-param-type)
 * [Overriding type](#overriding-type)
 * [Multi types](#multi-types)
+* [Hiding parameters](#hiding-parameters)
 * [Response documentation](#response)
 
 
@@ -528,6 +529,20 @@ end
 }
 ```
 
+#### Hiding parameters
+
+Exclude single optional parameter from the documentation
+
+```ruby
+params do
+  optional :one, documentation: { hidden: true }
+  optional :two, documentation: { hidden: -> { true } }
+end
+post :act do
+  ...
+end
+```
+
 #### Overriding the route summary
 
 By default, the route summary is filled with the value supplied to `desc`.

lib/grape-swagger/endpoint.rb

@@ -221,13 +221,13 @@ def default_type(params)
       end
     end
 
-    def parse_request_params(required)
+    def parse_request_params(params)
       array_key = nil
-      required.each_with_object({}) do |param, memo|
-        array_key = param.first.to_s if param_type_is_array?(param.last[:type])
-
-        param.last[:is_array] = true if array_key && param.first.start_with?(array_key)
-        memo[param.first] = param.last unless (param.last[:type] == 'Hash' || param.last[:type] == 'Array') && !param.last.key?(:documentation)
+      params.select { |param| public_parameter?(param) }.each_with_object({}) do |param, memo|
+        name, options = *param
+        array_key = name.to_s if param_type_is_array?(options[:type])
+        options[:is_array] = true if array_key && name.start_with?(array_key)
+        memo[param.first] = options unless (options[:type] == 'Hash' || options[:type] == 'Array') && !options.key?(:documentation)
       end
     end
 
@@ -274,5 +274,13 @@ def hidden?(route)
       route_hidden = route_hidden.call if route_hidden.is_a?(Proc)
       route_hidden
     end
+
+    def public_parameter?(param)
+      param_options = param.last
+      return true unless param_options.key?(:documentation) && !param_options[:required]
+      param_hidden = param_options[:documentation].fetch(:hidden, false)
+      param_hidden = param_hidden.call if param_hidden.is_a?(Proc)
+      !param_hidden
+    end
   end
 end

spec/swagger_v2/api_swagger_v2_hide_param_spec.rb

@@ -0,0 +1,90 @@
+require 'spec_helper'
+
+describe 'hidden flag enables a single endpoint parameter to be excluded from the documentation' do
+  include_context "#{MODEL_PARSER} swagger example"
+  before :all do
+    module TheApi
+      class HideParamsApi < Grape::API
+        namespace :flat_params_endpoint do
+          desc 'This is a endpoint with a flat parameter hierarchy'
+          params do
+            requires :name, type: String, documentation: { desc: 'name' }
+            optional :favourite_color, type: String, documentation: { desc: 'I should not be anywhere', hidden: true }
+            optional :proc_param, type: String, documentation: { desc: 'I should not be anywhere', hidden: -> { true } }
+          end
+
+          post do
+            { 'declared_params' => declared(params) }
+          end
+        end
+
+        namespace :nested_params_endpoint do
+          desc 'This is a endpoint with a nested parameter hierarchy'
+          params do
+            optional :name, type: String, documentation: { desc: 'name' }
+            optional :hidden_attribute, type: Hash do
+              optional :favourite_color, type: String, documentation: { desc: 'I should not be anywhere', hidden: true }
+            end
+
+            optional :attributes, type: Hash do
+              optional :attribute_1, type: String, documentation: { desc: 'Attribute one' }
+              optional :hidden_attribute, type: String, documentation: { desc: 'I should not be anywhere', hidden: true }
+            end
+          end
+
+          post do
+            { 'declared_params' => declared(params) }
+          end
+        end
+
+        namespace :required_param_endpoint do
+          desc 'This endpoint has hidden defined for a required parameter'
+          params do
+            requires :name, type: String, documentation: { desc: 'name', hidden: true }
+          end
+
+          post do
+            { 'declared_params' => declared(params) }
+          end
+        end
+
+        add_swagger_documentation
+      end
+    end
+  end
+
+  let(:app) { TheApi::HideParamsApi }
+
+  describe 'simple flat parameter hierarchy' do
+    subject do
+      get '/swagger_doc/flat_params_endpoint'
+      JSON.parse(last_response.body)
+    end
+
+    specify do
+      expect(subject['paths']['/flat_params_endpoint']['post']['parameters'].map { |p| p['name'] }).not_to include('favourite_color', 'proc_param')
+    end
+  end
+
+  describe 'nested parameter hierarchy' do
+    subject do
+      get '/swagger_doc/nested_params_endpoint'
+      JSON.parse(last_response.body)
+    end
+
+    specify do
+      expect(subject['paths']['/nested_params_endpoint']['post']['parameters'].map { |p| p['name'] }).not_to include(/hidden_attribute/)
+    end
+  end
+
+  describe 'hidden defined for required parameter' do
+    subject do
+      get '/swagger_doc/required_param_endpoint'
+      JSON.parse(last_response.body)
+    end
+
+    specify do
+      expect(subject['paths']['/required_param_endpoint']['post']['parameters'].map { |p| p['name'] }).to include('name')
+    end
+  end
+end