Add test to updating mysql obj

spec/weather-model_spec.rb

@@ -23,7 +23,7 @@ RSpec.describe WeatherModel do
   end
 
   it 'Forecast' do
-    Forecast::ShanghaiTen.create({
+    mysql_obj = Forecast::ShanghaiTen.create({
           datetime: '2017-05-16',
           cityname: 'shanghai',
           temp_high: '100',
@@ -35,10 +35,13 @@ RSpec.describe WeatherModel do
         })
     expect(Forecast::ShanghaiTen.count).to eq(1)
     expect(Forecast::ShanghaiTen::Ohm.all.count).to eq(1)
-  #  p 'p Forecast::ShanghaiTen::Ohm.all.first.attributes'
-  # ttl 失败
-      p Forecast::ShanghaiTen::Ohm.all.to_a
-      p Forecast::ShanghaiTen::Ohm.all.to_a.map(&:get_ttl)
+
+    expect(Forecast::ShanghaiTen::Ohm.all.first.temp_low).to eq(mysql_obj.temp_low.to_s)
+    # 'ohm 对象 同步 mysql对象更新'
+    mysql_obj.update(temp_low: 99)
+    expect(Forecast::ShanghaiTen::Ohm.all.first.temp_low).to eq('99'), 'ohm 对象 同步 mysql对象更新'
+    # ttl 失败
+    # p Forecast::ShanghaiTen::Ohm.all.to_a.map(&:get_ttl)
 
   end