Move code for issue creation to service.

The goal of suych refactoring is to get rid of observers.
Its much easier to test and code when object creation and all other
related actions done in one class instead of splited across observers,
callbacks etc.
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/projects/issues_controller.rb

@@ -59,9 +59,7 @@ class Projects::IssuesController < Projects::ApplicationController
   end
 
   def create
-    @issue = @project.issues.new(params[:issue])
-    @issue.author = current_user
-    @issue.save
+    @issue = Issues::CreateService.new(project, current_user, params[:issue]).execute
 
     respond_to do |format|
       format.html do

app/observers/issue_observer.rb

 class IssueObserver < BaseObserver
-  def after_create(issue)
-    notification.new_issue(issue, current_user)
-    event_service.open_issue(issue, current_user)
-    issue.create_cross_references!(issue.project, current_user)
-    execute_hooks(issue)
-  end
-
   def after_close(issue, transition)
     notification.close_issue(issue, current_user)
     event_service.close_issue(issue, current_user)

app/services/base_service.rb

@@ -16,4 +16,16 @@ class BaseService
   def can?(object, action, subject)
     abilities.allowed?(object, action, subject)
   end
+
+  def notification_service
+    NotificationService.new
+  end
+
+  def event_service
+    EventCreateService.new
+  end
+
+  def log_info message
+    Gitlab::AppLogger.info message
+  end
 end

app/services/issues/create_service.rb

+module Issues
+  class CreateService < BaseService
+    def execute
+      issue = project.issues.new(params)
+      issue.author = current_user
+
+      if issue.save
+        notification_service.new_issue(issue, current_user)
+        event_service.open_issue(issue, current_user)
+        issue.create_cross_references!(issue.project, current_user)
+        execute_hooks(issue)
+      end
+
+      issue
+    end
+
+    private
+
+    def execute_hooks(issue)
+      issue.project.execute_hooks(issue.to_hook_data, :issue_hooks)
+    end
+  end
+end

lib/api/issues.rb

@@ -48,19 +48,17 @@ module API
       # Example Request:
       #   POST /projects/:id/issues
       post ":id/issues" do
-        set_current_user_for_thread do
         required_attributes! [:title]
         attrs = attributes_for_keys [:title, :description, :assignee_id, :milestone_id]
         attrs[:label_list] = params[:labels] if params[:labels].present?
-          @issue = user_project.issues.new attrs
-          @issue.author = current_user
-          if @issue.save
-            present @issue, with: Entities::Issue
+        issue = ::Issues::CreateService.new(user_project, current_user, attrs).execute
+
+        if issue.valid?
+          present issue, with: Entities::Issue
         else
           not_found!
         end
       end
-      end
 
       # Update an existing issue
       #

spec/services/issues/create_service_spec.rb

+require 'spec_helper'
+
+describe Issues::CreateService do
+  let(:project) { create(:empty_project) }
+  let(:user) { create(:user) }
+
+  describe :execute do
+    context "valid params" do
+      before do
+        project.team << [user, :master]
+        opts = {
+          title: 'Awesome issue',
+          description: 'please fix'
+        }
+
+        @issue = Issues::CreateService.new(project, user, opts).execute
+      end
+
+      it { @issue.should be_valid }
+    end
+  end
+end