空数据库时部分数据没有，添加非空判断

app/controllers/users_controller.rb

@@ -791,7 +791,7 @@ class UsersController < ApplicationController
 
   # 必填自己的工作单位，其实就是学校
   def auth_user_extension
-    if @user == User.current && @user.user_extensions.school.nil?
+    if @user == User.current && (@user.user_extensions.nil? || @user.user_extensions.school.nil?)
       flash[:error] = l(:error_complete_occupation)
       redirect_to my_account_path
     end

app/controllers/welcome_controller.rb

@@ -64,7 +64,7 @@ class WelcomeController < ApplicationController
     @course_page = FirstPage.where("page_type = 'course'").first
     if params[:school_id]
       @school_id = params[:school_id]
-    elsif User.current.logged?  && User.current.user_extensions.school
+    elsif User.current.logged?  && User.current.user_extensions.try(:school)
       @school_id = User.current.user_extensions.school.try(:id)
     end
     @logoLink ||= logolink()

db/schema.rb

@@ -437,9 +437,9 @@ ActiveRecord::Schema.define(:version => 20140826072838) do
     t.string   "web_title"
     t.string   "title"
     t.text     "description"
-    t.string   "page_type"
     t.datetime "created_at",                    :null => false
     t.datetime "updated_at",                    :null => false
+    t.string   "page_type"
     t.integer  "sort_type"
     t.integer  "image_width",  :default => 107
     t.integer  "image_height", :default => 63
@@ -976,10 +976,11 @@ ActiveRecord::Schema.define(:version => 20140826072838) do
     t.string   "url"
     t.string   "title"
     t.integer  "share_type"
-    t.datetime "created_at", :null => false
-    t.datetime "updated_at", :null => false
+    t.datetime "created_at",  :null => false
+    t.datetime "updated_at",  :null => false
     t.integer  "project_id"
     t.integer  "user_id"
+    t.string   "description"
   end
 
   create_table "softapplications", :force => true do |t|
@@ -1085,8 +1086,8 @@ ActiveRecord::Schema.define(:version => 20140826072838) do
     t.integer  "zip_code"
     t.datetime "created_at",         :null => false
     t.datetime "updated_at",         :null => false
-    t.integer  "identity"
     t.string   "technical_title"
+    t.integer  "identity"
     t.string   "student_id"
     t.string   "teacher_realname"
     t.string   "student_realname"
@@ -1144,9 +1145,6 @@ ActiveRecord::Schema.define(:version => 20140826072838) do
     t.integer  "active"
     t.datetime "created_at",    :null => false
     t.datetime "updated_at",    :null => false
-    t.integer  "level"
-    t.integer  "file"
-    t.integer  "issue"
   end
 
   create_table "user_statuses", :force => true do |t|