react.js构造函数被调用两次

我有一个帖子列表，我试图为每个帖子在构造函数或componentDidMount内部调用一个动作.但是以某种方式，当我发送新消息时，构造函数和componentDidMount函数会被调用两次.

I a have post list and I am trying to call an action inside of constructor or componentDidMount for each post. But somehow when I send a new message constructor and componentDidMount functions are called twice.

 constructor(props) {
    super(props);

    if (condition1) {
       this.props.actions.action1();
    } else if (condition2) {
       this.props.actions.action2();
    }    
}

从列表中读取帖子时，这些函数仅被调用一次.但是，当我发送新消息时，它们被称为两次.

These functions are called only once when the posts are readed from a list. But when I send a new message they are called twice.

我如何避免这些情况.我试图像这样使用componendDidUpdate函数:

How can i avoid these situation. I tried to use componendDidUpdate function like this:

componentDidUpdate(prevProps, prevState) {     
      if (prevProps.post.id !== this.props.post.id) {
         if (condition1) {
            this.props.actions.action1();
         } else if (condition2) {
            this.props.actions.action2();
         }
      }   
}