定义各model之间的关系

app/models/poll_answers.rb

@@ -1,3 +1,5 @@
 class PollAnswers < ActiveRecord::Base
   attr_accessible :answer_position, :answer_text, :poll_questions_id
+
+  belongs_to :poll_questions
 end

app/models/poll_questions.rb

@@ -1,3 +1,5 @@
 class PollQuestions < ActiveRecord::Base
   attr_accessible :is_necessary, :polls_id, :question_title, :question_type
+
+  belongs_to :polls
 end

app/models/poll_user.rb

@@ -1,3 +1,6 @@
 class PollUser < ActiveRecord::Base
   attr_accessible :poll_id, :user_id
+
+  belongs_to :polls
+  belongs_to :user
 end

app/models/poll_votes.rb

@@ -1,3 +1,7 @@
 class PollVotes < ActiveRecord::Base
   attr_accessible :poll_answers_id, :poll_questions_id, :user_id, :vote_text
+
+  belongs_to :poll_answers
+  belongs_to :poll_questions
+  belongs_to :user
 end

app/models/polls.rb

@@ -1,3 +1,5 @@
 class Polls < ActiveRecord::Base
   attr_accessible :closed_at, :polls_group_id, :polls_name, :polls_status, :polls_type, :published_at, :user_id
+
+  belongs_to :user
 end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20141231085350) do
+ActiveRecord::Schema.define(:version => 20150108035338) do
 
   create_table "activities", :force => true do |t|
     t.integer "act_id",   :null => false
@@ -790,6 +790,51 @@ ActiveRecord::Schema.define(:version => 20141231085350) do
     t.integer  "project_id"
   end
 
+  create_table "poll_answers", :force => true do |t|
+    t.integer  "poll_questions_id"
+    t.text     "answer_text"
+    t.integer  "answer_position"
+    t.datetime "created_at",        :null => false
+    t.datetime "updated_at",        :null => false
+  end
+
+  create_table "poll_questions", :force => true do |t|
+    t.string   "question_title"
+    t.integer  "question_type"
+    t.integer  "is_necessary"
+    t.integer  "polls_id"
+    t.datetime "created_at",     :null => false
+    t.datetime "updated_at",     :null => false
+  end
+
+  create_table "poll_users", :force => true do |t|
+    t.integer  "user_id"
+    t.integer  "poll_id"
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
+  end
+
+  create_table "poll_votes", :force => true do |t|
+    t.integer  "user_id"
+    t.integer  "poll_questions_id"
+    t.integer  "poll_answers_id"
+    t.text     "vote_text"
+    t.datetime "created_at",        :null => false
+    t.datetime "updated_at",        :null => false
+  end
+
+  create_table "polls", :force => true do |t|
+    t.string   "polls_name"
+    t.string   "polls_type"
+    t.integer  "polls_group_id"
+    t.integer  "polls_status"
+    t.integer  "user_id"
+    t.datetime "published_at"
+    t.datetime "closed_at"
+    t.datetime "created_at",     :null => false
+    t.datetime "updated_at",     :null => false
+  end
+
   create_table "praise_tread_caches", :force => true do |t|
     t.integer  "object_id",   :null => false
     t.string   "object_type"