init project

app/libs/wechat/error.rb

@@ -0,0 +1,14 @@
+class Wechat::Error < StandardError
+  attr_reader :code
+
+  def initialize(code, message)
+    super message
+    @code = code
+  end
+
+  class << self
+    def parse(result)
+      new(result['errcode'], result['errmsg'])
+    end
+  end
+end