Added appriasals for multi_json and multi_xml, removed from all tests.

.travis.yml

@@ -17,6 +17,10 @@ matrix:
       gemfile: gemfiles/rails_edge.gemfile
     - rvm: 2.4.1
       gemfile: gemfiles/rails_5.gemfile
+    - rvm: 2.4.1
+      gemfile: gemfiles/multi_json.gemfile
+    - rvm: 2.4.1
+      gemfile: gemfiles/multi_xml.gemfile
     - rvm: 2.3.4
       gemfile: Gemfile
     - rvm: 2.3.4

Appraisals

@@ -22,3 +22,11 @@ end
 appraise 'rack-edge' do
   gem 'rack', github: 'rack/rack'
 end
+
+appraise 'multi_json' do
+  gem 'multi_json'
+end
+
+appraise 'multi_xml' do
+  gem 'multi_xml'
+end

Gemfile

@@ -22,8 +22,6 @@ group :development do
 end
 
 group :test do
-  gem 'multi_json'
-  gem 'multi_xml'
   gem 'grape-entity', '~> 0.6'
   gem 'maruku'
   gem 'rack-test'

README.md

@@ -69,6 +69,7 @@
   - [CORS](#cors)
 - [Content-type](#content-type)
 - [API Data Formats](#api-data-formats)
+- [JSON and XML Processors](#json-and-xml-processors)
 - [RESTful Model Representations](#restful-model-representations)
   - [Grape Entities](#grape-entities)
   - [Hypermedia and Roar](#hypermedia-and-roar)
@@ -1146,7 +1147,7 @@ end
 ```
 
 The `:values` option can also be supplied with a `Proc`, evaluated lazily with each request.
-If the Proc has arity zero (i.e. it takes no arguments) it is expected to return either a list 
+If the Proc has arity zero (i.e. it takes no arguments) it is expected to return either a list
 or a range which will then be used to validate the parameter.
 
 For example, given a status model you may want to restrict by hashtags that you have
@@ -2564,6 +2565,10 @@ curl -X PUT -d 'data' 'http://localhost:9292/value' -H Content-Type:text/custom
 
 You can disable parsing for a content-type with `nil`. For example, `parser :json, nil` will disable JSON parsing altogether. The request data is then available as-is in `env['api.request.body']`.
 
+## JSON and XML Processors
+
+Grape uses `JSON` and `ActiveSupport::XmlMini` for JSON and XML parsing by default. It also detects and supports [multi_json](https://github.com/intridea/multi_json) and [multi_xml](https://github.com/sferik/multi_xml). Adding those gems to your Gemfile will automatically enable them and allow you to swap the JSON and XML back-ends.
+
 ## RESTful Model Representations
 
 Grape supports a range of ways to present your data with some help from a generic `present` method,

UPGRADING.md

@@ -3,6 +3,14 @@ Upgrading Grape
 
 ### Upgrading to >= 1.0.0
 
+#### Changes in XML and JSON Parsers
+
+Grape no longer uses `multi_json` or `multi_xml` by default and uses `JSON` and `ActiveSupport::XmlMini` instead. This has no visible impact on JSON processing, but the default behavior of the XML parser has changed. For example, an XML POST containing `<user>Bobby T.</user>` was parsed as `Bobby T.` with `multi_xml`, and as now parsed as `{"__content__"=>"Bobby T."}` with `XmlMini`.
+
+To restore previous behavior, add `multi_json` or `multi_xml` to your `Gemfile`, Grape will auto-detect it.
+
+See [#1623](https://github.com/ruby-grape/grape/pull/1623) for more information.
+
 #### Changes in Parameter Class
 
 The default class for `params` has changed from `Hashie::Mash` to `ActiveSupport::HashWithIndifferentAccess` and the `hashie` dependency has been removed. This means that by default you can no longer access parameters by method name.

gemfiles/multi_json.gemfile

@@ -0,0 +1,36 @@
+# This file was generated by Appraisal
+
+source 'https://rubygems.org'
+
+gem 'multi_json'
+
+group :development, :test do
+  gem 'bundler'
+  gem 'rake'
+  gem 'rubocop', '0.47.0'
+  gem 'hashie'
+end
+
+group :development do
+  gem 'guard'
+  gem 'guard-rspec'
+  gem 'guard-rubocop'
+  gem 'yard'
+  gem 'appraisal'
+  gem 'benchmark-ips'
+  gem 'redcarpet'
+end
+
+group :test do
+  gem 'grape-entity', '~> 0.6'
+  gem 'maruku'
+  gem 'rack-test'
+  gem 'rspec', '~> 3.0'
+  gem 'cookiejar'
+  gem 'rack-jsonp', require: 'rack/jsonp'
+  gem 'mime-types'
+  gem 'ruby-grape-danger', '~> 0.1.0', require: false
+  gem 'coveralls', '~> 0.8.17', require: false
+end
+
+gemspec path: '../'

gemfiles/multi_xml.gemfile

@@ -0,0 +1,36 @@
+# This file was generated by Appraisal
+
+source 'https://rubygems.org'
+
+gem 'multi_xml'
+
+group :development, :test do
+  gem 'bundler'
+  gem 'rake'
+  gem 'rubocop', '0.47.0'
+  gem 'hashie'
+end
+
+group :development do
+  gem 'guard'
+  gem 'guard-rspec'
+  gem 'guard-rubocop'
+  gem 'yard'
+  gem 'appraisal'
+  gem 'benchmark-ips'
+  gem 'redcarpet'
+end
+
+group :test do
+  gem 'grape-entity', '~> 0.6'
+  gem 'maruku'
+  gem 'rack-test'
+  gem 'rspec', '~> 3.0'
+  gem 'cookiejar'
+  gem 'rack-jsonp', require: 'rack/jsonp'
+  gem 'mime-types'
+  gem 'ruby-grape-danger', '~> 0.1.0', require: false
+  gem 'coveralls', '~> 0.8.17', require: false
+end
+
+gemspec path: '../'

gemfiles/rack_1.5.2.gemfile

@@ -22,8 +22,6 @@ group :development do
 end
 
 group :test do
-  gem 'multi_json'
-  gem 'multi_xml'
   gem 'grape-entity', '~> 0.6'
   gem 'maruku'
   gem 'rack-test'

gemfiles/rack_edge.gemfile

@@ -22,8 +22,6 @@ group :development do
 end
 
 group :test do
-  gem 'multi_json'
-  gem 'multi_xml'
   gem 'grape-entity', '~> 0.6'
   gem 'maruku'
   gem 'rack-test'

gemfiles/rails_3.gemfile

@@ -23,8 +23,6 @@ group :development do
 end
 
 group :test do
-  gem 'multi_json'
-  gem 'multi_xml'
   gem 'grape-entity', '~> 0.6'
   gem 'maruku'
   gem 'rack-test'

gemfiles/rails_4.gemfile

@@ -22,8 +22,6 @@ group :development do
 end
 
 group :test do
-  gem 'multi_json'
-  gem 'multi_xml'
   gem 'grape-entity', '~> 0.6'
   gem 'maruku'
   gem 'rack-test'

gemfiles/rails_5.gemfile

@@ -22,8 +22,6 @@ group :development do
 end
 
 group :test do
-  gem 'multi_json'
-  gem 'multi_xml'
   gem 'grape-entity', '~> 0.6'
   gem 'maruku'
   gem 'rack-test'

gemfiles/rails_edge.gemfile

@@ -22,8 +22,6 @@ group :development do
 end
 
 group :test do
-  gem 'multi_json'
-  gem 'multi_xml'
   gem 'grape-entity', '~> 0.6'
   gem 'maruku'
   gem 'rack-test'

spec/grape/api_spec.rb

@@ -2225,14 +2225,14 @@ def self.call(object, _env)
         expect(last_response.body).to eql 'elpmis'
       end
     end
-    context 'multi_xml' do
-      it "doesn't parse yaml" do
+    context 'default xml parser' do
+      it 'parses symbols' do
         subject.put :yaml do
           params[:tag]
         end
         put '/yaml', '<tag type="symbol">a123</tag>', 'CONTENT_TYPE' => 'application/xml'
-        expect(last_response.status).to eq(400)
-        expect(last_response.body).to eql 'Disallowed type attribute: "symbol"'
+        expect(last_response.status).to eq(200)
+        expect(last_response.body).to eql '{"type"=>"symbol", "__content__"=>"a123"}'
       end
     end
     context 'none parser class' do

spec/grape/endpoint_spec.rb

@@ -884,12 +884,12 @@ def app
 
       it 'converts XML bodies to params' do
         post '/request_body', '<user>Bobby T.</user>', 'CONTENT_TYPE' => 'application/xml'
-        expect(last_response.body).to eq('Bobby T.')
+        expect(last_response.body).to eq('{"__content__"=>"Bobby T."}')
       end
 
       it 'converts XML bodies to params' do
         put '/request_body', '<user>Bobby T.</user>', 'CONTENT_TYPE' => 'application/xml'
-        expect(last_response.body).to eq('Bobby T.')
+        expect(last_response.body).to eq('{"__content__"=>"Bobby T."}')
       end
 
       it 'does not include parameters not defined by the body' do

spec/grape/middleware/formatter_spec.rb

@@ -274,7 +274,7 @@ def to_xml
           'rack.input' => io,
           'CONTENT_LENGTH' => io.length
         )
-        expect(subject.env['rack.request.form_hash']['thing']['name']).to eq('Test')
+        expect(subject.env['rack.request.form_hash']['thing']['name']['__content__']).to eq('Test')
       end
       [Rack::Request::FORM_DATA_MEDIA_TYPES, Rack::Request::PARSEABLE_DATA_MEDIA_TYPES].flatten.each do |content_type|
         it "ignores #{content_type}" do