Add new valid fightpost can save test, need below PR to merge.

mbleigh/acts-as-taggable-on#720

db/schema.rb

@@ -74,10 +74,10 @@
 
   create_table "taggings", force: :cascade do |t|
     t.integer  "tag_id"
-    t.integer  "taggable_id"
     t.string   "taggable_type"
-    t.integer  "tagger_id"
+    t.integer  "taggable_id"
     t.string   "tagger_type"
+    t.integer  "tagger_id"
     t.string   "context",       limit: 128
     t.datetime "created_at"
   end

db/seeds.rb

@@ -14,7 +14,7 @@
 
 99.times do |n|
   name  = Faker::Name.name
-  email = "example-#{n+1}@railstutorial.org"
+  email = "example-#{n + 1}@railstutorial.org"
   User.create!(name:  name,
                email: email,
                password:              'password',
@@ -24,9 +24,9 @@
 users = User.order(:created_at).take(6)
 50.times do
   content = Faker::Lorem.sentence(5)
-  tag = ['Aikido', 'Karate', 'Taekwondo', 'Thai boxing', 'Boxing', 'Tai Chi', 'Sanda', 'Kendo', 
-          'Wing Chun', 'Judo', '八极拳'].sample
-  users.each { |user| user.fightposts.create!(content: content, tag_list: tag) }
+  tag_list = ['Aikido', 'Karate', 'Taekwondo', 'Thai boxing', 'Boxing', 'Tai Chi', 'Sanda', 'Kendo',
+              'Wing Chun', 'Judo', '八极拳']
+  users.each { |user| user.fightposts.create!(content: content, tag_list: tag_list.sample) }
 end
 
 # Following relationships

test/models/fightpost_test.rb

@@ -3,7 +3,7 @@
 class FightpostTest < ActiveSupport::TestCase
   def setup
     @user = users(:michael)
-    @fightpost = @user.fightposts.build(content: 'aikido')
+    @fightpost = @user.fightposts.build(content: 'aikido', tag_list: 'Aikido')
   end
 
   test 'should be valid' do
@@ -25,6 +25,11 @@ def setup
     assert_not @fightpost.valid?
   end
 
+  test 'valid fightpost can save' do
+    @fightpost.save!
+    assert_not @fightpost.new_record?
+  end
+
   test 'order should be most recent first' do
     assert_equal Fightpost.first, fightposts(:most_recent)
   end