我正在使用redux-thunk在我的react应用中执行异步操作,如下所示:
export const fetchImages = (objects) => dispatch => {
const promises = objects.map(obj => axios
.get(`${API_URL}/files/${obj.img ? vendor.img : 'default.png'}`, {responseType: 'arraybuffer'})
.then( res => obj.imgData = 'data:;base64,' + convertArrayBufferToBase64(res.data))
);
return Promise.all(promises).then (() => Promise.resolve(objects));
}
当我在任何组件中使用它时,它都可以正常工作。但是,如果我将其用于其他操作,例如:
export const fetchAllObjects = () => dispatch => axios.get(`${API_URL}/objects?limit=50`)
.then(res => fetchImages(res.data.docs).then(objects =>
dispatch({
type: FETCH_ALL_OBJECTS,
payload: objects
});
));
失败。我希望它返回一个promise,但是它返回“ dispatch => ...”,因此then()
在返回的值上失败。
答案 0 :(得分:1)
我刚刚注意到fetchImages
是一个返回函数的函数:
export const fetchAllObjects = () => dispatch => axios.get(`${API_URL}/objects?limit=50`)
.then(res => fetchImages(res.data.docs)(dispatch).then(objects =>
dispatch({
type: FETCH_ALL_OBJECTS,
payload: objects
});
));