v3: avoid having to repeat the resource type over and over in services, automatically wrap return value in result

lib/travis/api/v3/service.rb

@@ -1,5 +1,11 @@
 module Travis::API::V3
   class Service
+    def self.result_type(type = nil)
+      @result_type = type if type
+      raise 'result type not set' unless defined? @result_type
+      @result_type
+    end
+
     attr_accessor :access_control, :params
 
     def initialize(access_control, params)
@@ -8,8 +14,20 @@ module Travis::API::V3
       @queries        = {}
     end
 
-    def query(type)
+    def query(type = self.class.result_type)
       @queries[type] ||= Queries[type].new(params)
     end
+
+    def not_found(actually_not_found = false, type = nil)
+      type, actually_not_found = actually_not_found, false if actually_not_found.is_a? Symbol
+      error = actually_not_found ? EntityMissing : NotFound
+      raise(error, type || self.class.result_type)
+    end
+
+    def run
+      not_found unless result = run!
+      result = Result.new(self.class.result_type, result) unless result.is_a? Result
+      result
+    end
   end
 end

lib/travis/api/v3/services/find_repository.rb

@@ -1,17 +1,18 @@
 module Travis::API::V3
   class Services::FindRepository < Service
-    def run
-      raise NotFound, :repository unless repository and access_control.visible? repository
-      Result.new(:repository, repository)
+    result_type :repository
+
+    def run!
+      repository if repository and access_control.visible? repository
     end
 
     def repository
-      raise EntityMissing, :repository if defined?(@repository) and @repository.nil?
+      not_found(true) if defined?(@repository) and @repository.nil?
       @repository ||= find_repository
     end
 
     def find_repository
-      query(:repository).find
+      query.find
     end
   end
 end

lib/travis/api/v3/services/repositories_for_current_user.rb

@@ -1,10 +1,10 @@
 module Travis::API::V3
   class Services::RepositoriesForCurrentUser < Service
-    def run
-      raise LoginRequired           unless access_control.logged_in?
-      raise NotFound, :repositories unless access_control.user
-      repositories = query(:repositories).for_member(access_control.user)
-      Result.new(:repositories, repositories)
+    result_type :repositories
+
+    def run!
+      raise LoginRequired unless access_control.logged_in?
+      query.for_member(access_control.user)
     end
   end
 end