项目和课程中加入组织时，如果已经加入了某组织，就不要重复加入。

app/controllers/org_courses_controller.rb

@@ -3,7 +3,9 @@ class OrgCoursesController < ApplicationController
     org_ids = params[:orgNames]
     @course = Course.find(params[:course_id])
     org_ids.each do |org_id|
-      OrgCourse.create(:organization_id => org_id.to_i, :course_id => params[:course_id].to_i, :created_at => Time.now)
+      if OrgCourse.where("organization_id =? and course_id =?", org_id.to_i, params[:course_id].to_i).count == 0
+        OrgCourse.create(:organization_id => org_id.to_i, :course_id => params[:course_id].to_i, :created_at => Time.now)
+      end
     end
     respond_to do |format|
       format.js

app/controllers/org_projects_controller.rb

@@ -3,7 +3,9 @@ class OrgProjectsController < ApplicationController
     org_ids = params[:orgNames]
     @project = Project.find(params[:project_id])
     org_ids.each do |org_id|
-      OrgProject.create(:organization_id => org_id.to_i, :project_id => params[:project_id].to_i, :created_at => Time.now)
+      if OrgProject.where("organization_id =? and project_id =?", org_id.to_i, @project.id).count == 0
+        OrgProject.create(:organization_id => org_id.to_i, :project_id => params[:project_id].to_i, :created_at => Time.now)
+      end
     end
     respond_to do |format|
       format.js