Use travis-settings to manage JSON settings field

Since we use repository.settings as a kind of dump for all
sorts of settings, some user-facing and some not, this lets us
leave the db as it is, but pretend to have separate models for each
"kind" of setting.

Gemfile

@@ -11,6 +11,7 @@ gem 'travis-settings', github: 'travis-ci/travis-settings'
 gem 'travis-sidekiqs', github: 'travis-ci/travis-sidekiqs'
 
 gem 'travis-yaml',     github: 'travis-ci/travis-yaml'
+gem 'travis-settings', github: 'travis-ci/travis-settings'
 gem 'mustermann',      github: 'rkh/mustermann'
 gem 'sinatra'
 gem 'sinatra-contrib', require: nil #github: 'sinatra/sinatra-contrib', require: nil

Gemfile.lock

@@ -53,6 +53,14 @@ GIT
       activemodel
       virtus
 
+GIT
+  remote: git://github.com/travis-ci/travis-settings.git
+  revision: d510e63b6c6f059cccae141c265e7a0c7236d1fd
+  specs:
+    travis-settings (0.0.1)
+      activemodel
+      virtus
+
 GIT
   remote: git://github.com/travis-ci/travis-sidekiqs.git
   revision: c5d4a4abc6c3737f9c43d3333efb94daa18b9fbb

lib/travis/api/v3/models/admin_settings.rb

@@ -0,0 +1,5 @@
+module Travis::API::V3
+  class Models::AdminSettings < Travis::Settings::Model
+    attribute :api_builds_rate_limit, Integer
+  end
+end

lib/travis/api/v3/models/repository.rb

@@ -65,7 +65,15 @@ module Travis::API::V3
     end
 
     def settings
-      @settings ||= JSON.load(super)
+      @settings ||= JSON.load(super || '{}'.freeze)
+    end
+
+    def user_settings
+      @user_settings ||= Models::UserSettings.new(settings)
+    end
+
+    def admin_settings
+      @admin_settings ||= Models::AdminSettings.new(settings)
     end
   end
 end

lib/travis/api/v3/models/settings.rb

@@ -1,12 +1,5 @@
 module Travis::API::V3
   class Models::Settings
-    DEFAULTS = {
-      'builds_only_with_travis_yml' => false,
-      'build_pushes' => true,
-      'build_pull_requests' => true,
-      'maximum_number_of_builds' => 0
-    }.freeze
-
     attr_reader :repository
 
     def initialize(repository)
@@ -14,13 +7,11 @@ module Travis::API::V3
     end
 
     def to_h
-      DEFAULTS.merge(repository.settings || {})
+      repository.user_settings.to_hash
     end
 
     def update(settings = {})
-      settings = to_h.merge(settings)
-      repository.settings.clear
-      settings.each { |k, v| repository.settings[k] = v }
+      repository.user_settings.update(settings)
       repository.save!
     end
   end

lib/travis/api/v3/models/user_settings.rb

@@ -0,0 +1,8 @@
+module Travis::API::V3
+  class Models::UserSettings < Travis::Settings::Model
+    attribute :builds_only_with_travis_yml, Boolean, default: false
+    attribute :build_pushes, Boolean, default: true
+    attribute :build_pull_requests, Boolean, default: true
+    attribute :maximum_number_of_builds, Integer, default: 0
+  end
+end

lib/travis/api/v3/services/requests/create.rb

@@ -23,11 +23,7 @@ module Travis::API::V3
     end
 
     def limit(repository)
-      if repository.settings.nil?
-        Travis.config.requests_create_api_limit || LIMIT
-      else
-        repository.settings["api_builds_rate_limit"] || Travis.config.requests_create_api_limit || LIMIT
-      end
+      repository.admin_settings.api_builds_rate_limit || Travis.config.requests_create_api_limit || LIMIT
     end
 
     def remaining_requests(repository)