增加问卷调查相关表，以及对应的model、control、view的文件夹

app/models/poll_answers.rb

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+class PollAnswers < ActiveRecord::Base
+  attr_accessible :answer_position, :answer_text, :poll_questions_id
+end

app/models/poll_questions.rb

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+class PollQuestions < ActiveRecord::Base
+  attr_accessible :is_necessary, :polls_id, :question_title, :question_type
+end

app/models/poll_user.rb

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+class PollUser < ActiveRecord::Base
+  attr_accessible :poll_id, :user_id
+end

app/models/poll_votes.rb

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+class PollVotes < ActiveRecord::Base
+  attr_accessible :poll_answers_id, :poll_questions_id, :user_id, :vote_text
+end

app/models/polls.rb

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+class Polls < ActiveRecord::Base
+  attr_accessible :closed_at, :polls_group_id, :polls_name, :polls_status, :polls_type, :published_at, :user_id
+end

db/migrate/20150108034148_create_polls.rb

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+class CreatePolls < ActiveRecord::Migration
+  def change
+    create_table :polls 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.timestamps
+    end
+  end
+end

db/migrate/20150108034253_create_poll_questions.rb

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+class CreatePollQuestions < ActiveRecord::Migration
+  def change
+    create_table :poll_questions do |t|
+      t.string :question_title
+      t.integer :question_type
+      t.integer :is_necessary
+      t.integer :polls_id
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20150108034414_create_poll_answers.rb

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+class CreatePollAnswers < ActiveRecord::Migration
+  def change
+    create_table :poll_answers do |t|
+      t.integer :poll_questions_id
+      t.text :answer_text
+      t.integer :answer_position
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20150108035301_create_poll_votes.rb

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+class CreatePollVotes < ActiveRecord::Migration
+  def change
+    create_table :poll_votes do |t|
+      t.integer :user_id
+      t.integer :poll_questions_id
+      t.integer :poll_answers_id
+      t.text :vote_text
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20150108035338_create_poll_users.rb

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+class CreatePollUsers < ActiveRecord::Migration
+  def change
+    create_table :poll_users do |t|
+      t.integer :user_id
+      t.integer :poll_id
+
+      t.timestamps
+    end
+  end
+end

test/unit/poll_answers_test.rb

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+require 'test_helper'
+
+class PollAnswersTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/unit/poll_questions_test.rb

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+require 'test_helper'
+
+class PollQuestionsTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/unit/poll_user_test.rb

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+require 'test_helper'
+
+class PollUserTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/unit/poll_votes_test.rb

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+require 'test_helper'
+
+class PollVotesTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/unit/polls_test.rb

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+require 'test_helper'
+
+class PollsTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end