Add change log links to gem page

app/models/linkset.rb

@@ -1,7 +1,7 @@
 class Linkset < ActiveRecord::Base
   belongs_to :rubygem
 
-  LINKS = %w(home code docs wiki mail bugs).freeze
+  LINKS = %w(home changelog code docs wiki mail bugs).freeze
 
   LINKS.each do |url|
     validates_formatting_of url.to_sym,

app/models/rubygem.rb

@@ -167,6 +167,7 @@ def payload(version = versions.most_recent, protocol = Gemcutter::PROTOCOL, host
       'mailing_list_uri'  => versioned_links.mailing_list_uri,
       'source_code_uri'   => versioned_links.source_code_uri,
       'bug_tracker_uri'   => versioned_links.bug_tracker_uri,
+      'changelog_uri'     => versioned_links.changelog_uri,
       'dependencies'      => {
         'development' => deps.select { |r| r.rubygem && 'development' == r.scope },
         'runtime'     => deps.select { |r| r.rubygem && 'runtime' == r.scope }

config/locales/en.yml

@@ -154,6 +154,7 @@ en:
       links:
         badge: Badge
         bugs: Bug Tracker
+        changelog: Change Log
         code: Source Code
         docs: Documentation
         download: Download
@@ -224,6 +225,7 @@ en:
       versions_since: "%{count} versions since %{since}"
     version:
       yanked: yanked
+
   will_paginate:
     next_label: Next
     page_gap: "…"

db/migrate/20151109014752_add_changelog_to_linksets.rb

@@ -0,0 +1,5 @@
+class AddChangelogToLinksets < ActiveRecord::Migration
+  def change
+    add_column :linksets, :changelog, :string
+  end
+end

db/schema.rb

@@ -12,7 +12,7 @@
 # It's strongly recommended that you check this file into your version control system.
 
 ActiveRecord::Schema.define(version: 20161231080902) do
-
+  
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
   enable_extension "hstore"
@@ -81,6 +81,7 @@
     t.string   "bugs"
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.string   "changelog"
   end
 
   add_index "linksets", ["rubygem_id"], name: "index_linksets_on_rubygem_id", using: :btree

test/factories.rb

@@ -39,6 +39,7 @@
     mail 'http://example.com'
     code 'http://example.com'
     bugs 'http://example.com'
+    changelog 'http://example.com'
   end
 
   factory :ownership do

test/unit/rubygem_test.rb

@@ -507,6 +507,7 @@ class RubygemTest < ActiveSupport::TestCase
         assert_equal @rubygem.linkset.mail, hash["mailing_list_uri"]
         assert_equal @rubygem.linkset.code, hash["source_code_uri"]
         assert_equal @rubygem.linkset.bugs, hash["bug_tracker_uri"]
+        assert_equal @rubygem.linkset.bugs, hash["changelog_uri"]
       end
 
       should "return version documentation uri if linkset docs is empty" do
@@ -525,6 +526,7 @@ class RubygemTest < ActiveSupport::TestCase
         assert_equal @rubygem.linkset.mail, doc.at_css("mailing-list-uri").content
         assert_equal @rubygem.linkset.code, doc.at_css("source-code-uri").content
         assert_equal @rubygem.linkset.bugs, doc.at_css("bug-tracker-uri").content
+        assert_equal @rubygem.linkset.changelog, doc.at_css("changelog-uri").content
       end
     end
   end