Question

从后端获取课程后，我试图找到一门课程，但是在获取内容后进入状态时，该状态为初始课程。 在安装组件时调用此功能

 findCourse = async () => {
     const { props, state } = this;
     const { idCourse } = state;
     const { loadCourseInfoProps, findCourse } = props;
     await loadCourseInfoProps(idCourse);// goes to the back end and fetches the course and its updated the state
     const course1 = findCourse(idCourse); // this functions should go to the updated state in the store and find the course with the id
     console.log(course1);
   };

映射器

const mapStateToProps = (state:any) => ({
  findCourse: (id:any) => getCourseSelector(state, id),
});
const mapDispatchToProps = (dispatch:Dispatch) => ({
  loadCourseInfoProps: (id:any) => dispatch(loadCourseInfo(id)),
});
export default connect(mapStateToProps, mapDispatchToProps)(withRouter(CourseInfoN));

我创建的吸气剂

export const getCourseSelector = (state:any, id:number) =>{
  console.log(state)
  return(
  state.courses.courses.find((course:any) => course.course_data.idCourse === id)
)};

还有异常行为

export const loadCourseInfo = (id:any) => async (dispatch:Dispatch, getState:any) => {
  dispatch(loadCourseInfoRequest());
  const state = getState();
  if (state.courses.courses.length !== 0) {
    const courseWithId = state.courses.courses.find((course:any) => course.course_data.idCourse === id);
    if (courseWithId.meta.contains_all || !courseWithId) {
      return;
    }
  }
  try {
    const course = await ApiService.courses.getCourse(id);
    console.log(course)
    const formattedCourse = courseFormatter(course);
    formattedCourse.meta.contains_all = true;
    dispatch(loadCourseInfoSuccess(formattedCourse));
    console.log("finished")
  } catch (error) {
    console.log("[error][1]", error);
    dispatch(loadCourseInfoFail(error));
  }
};

在图像中，您可以看到已完成的日志已打印，并且此时已完成了变异，但是getter中的下一个console.log状态仍然为空图片链接：https://i.stack.imgur.com/Yuglp.png

Answer 1

您不应期望在同一函数调用中出现更新状态。如果您希望拥有新的状态，则可能应该在收到状态的同一操作中对其进行处理：

export const loadCourseInfo = (id:any) => async (dispatch:Dispatch, getState:any) => {
  ...
    const course = await ApiService.courses.getCourse(id);
    // use it right here
};

或者您可以在下一个渲染器上使用更新的状态。

我同意时Redux状态不会更新

1 个答案: