Merge branch 'ouvrages-exclude_nil_links'

Author: bf4

CHANGELOG.md

@@ -5,6 +5,7 @@
 Breaking changes:
 
 Features:
+- [#1668](https://github.com/rails-api/active_model_serializers/pull/1668) Exclude nil and empty links. (@sigmike)
 - [#1426](https://github.com/rails-api/active_model_serializers/pull/1426) Add ActiveModelSerializers.config.default_includes (@empact)
 
 Fixes:

lib/active_model_serializers/adapter/json_api.rb

@@ -474,7 +474,8 @@ def relationships_for(serializer, requested_associations)
       #   }.reject! {|_,v| v.nil? }
       def links_for(serializer)
         serializer._links.each_with_object({}) do |(name, value), hash|
-          hash[name] = Link.new(serializer, value).as_json
+          result = Link.new(serializer, value).as_json
+          hash[name] = result if result
         end
       end
 

lib/active_model_serializers/adapter/json_api/link.rb

@@ -71,7 +71,7 @@ def as_json
           hash[:href] = @href if defined?(@href)
           hash[:meta] = @meta if defined?(@meta)
 
-          hash
+          hash.any? ? hash : nil
         end
 
         protected

test/adapter/json_api/links_test.rb

@@ -17,6 +17,7 @@ class LinkAuthorSerializer < ActiveModel::Serializer
           link :yet_another do
             "http://example.com/resource/#{object.id}"
           end
+          link(:nil) { nil }
         end
 
         def setup