fixed assignment default_error_formatter

lib/grape/api.rb

@@ -147,8 +147,13 @@ def parser(content_type, new_parser)
  end
 
  # Specify a default error formatter.
- def default_error_formatter(new_formatter = nil)
- new_formatter ? set(:default_error_formatter, new_formatter) : settings[:default_error_formatter]
+ def default_error_formatter(new_formatter_name = nil)
+ if new_formatter_name
+ new_formatter = Grape::ErrorFormatter::Base.formatter_for(new_formatter_name, {})
+ set(:default_error_formatter, new_formatter)
+ else
+ settings[:default_error_formatter]
+ end
  end
 
  def error_formatter(format, options)

spec/grape/api_spec.rb

@@ -2191,4 +2191,17 @@ def before
  end
  end
  end
+
+ context 'with json default_error_formatter' do
+ it 'return json error' do
+ subject.content_type :json, "application/json"
+ subject.default_error_formatter :json
+ subject.get '/something' do
+ 'foo'
+ end
+ get '/something'
+ last_response.status.should == 406
+ last_response.body.should == "{\"error\":\"The requested format 'txt' is not supported.\"}"
+ end
+ end
 end